Slicers (applies to each fact value in each table cell)

Reporting Entity [Axis]

0000016875 (http://www.sec.gov/CIK)

Compensation and Retirement Disclosure [Abstract]	Period [Axis]
	2016-01-01 - 2016-12-31
Compensation and Retirement Disclosure [Abstract]
Net Periodic Benefit Cost for DB Pension Plans and Other Benefits	The elements of net periodic benefit cost for DB pension plans and other benefits recognized in the year include the following components:   Pensions Other benefits (in millions of Canadian dollars) 2016 2015 2014 2016 2015 2014 Current service cost (benefits earned by employees in the year) $ 106 $ 126 $ 106 $ 11 $ 12 $ 14 Interest cost on benefit obligation 467 463 477 21 21 23 Expected return on fund assets (846 ) (816 ) (757 ) — — — Recognized net actuarial loss (gain) 190 265 190 7 2 (2 ) Amortization of prior service costs (7 ) (6 ) (68 ) 1 1 — Net periodic benefit (recovery) cost $ (90 ) $ 32 $ (52 ) $ 40 $ 36 $ 35
Information About DB Pension Plans and Other Benefits	Information about the Company’s DB pension plans and other benefits, in aggregate, is as follows:   Pensions Other benefits (in millions of Canadian dollars) 2016 2015 2016 2015 Change in projected benefit obligation:           Benefit obligation at January 1 $ 11,194 $ 11,360 $ 513 $ 517 Current service cost 106 126 11 12 Interest cost 467 463 21 21 Employee contributions 40 43 1 1 Benefits paid (645 ) (608 ) (31 ) (34 ) Foreign currency changes (7 ) 42 — 4 Plan amendments and other 6 (6 ) — — Actuarial loss (gain) 238 (226 ) (5 ) (8 ) Projected benefit obligation at December 31 $ 11,399 $ 11,194 $ 510 $ 513   Pensions Other benefits (in millions of Canadian dollars) 2016 2015 2016 2015 Change in fund assets:           Fair value of fund assets at January 1 $ 12,300 $ 11,376 $ 6 $ 7 Actual return on fund assets 461 1,374 (1 ) (1 ) Employer contributions 48 81 30 33 Employee contributions 40 43 1 1 Benefits paid (645 ) (608 ) (31 ) (34 ) Foreign currency changes (8 ) 34 — — Fair value of fund assets at December 31 $ 12,196 $ 12,300 $ 5 $ 6 Funded status – plan surplus (deficit) $ 797 $ 1,106 $ (505 ) $ (507 )
Pension Plan Asset	2016 2015 (in millions of Canadian dollars) Pension plans in surplus Pension plans in deficit Pension plans in surplus Pension plans in deficit Projected benefit obligation at December 31 $ (10,902 ) $ (497 ) $ (10,681 ) $ (513 ) Fair value of fund assets at December 31 11,972 224 12,082 218 Funded Status $ 1,070 $ (273 ) $ 1,401 $ (295 )
Amounts Recognized in the Company's Consolidated Balance Sheets	Amounts recognized in the Company’s Consolidated Balance Sheets are as follows:   Pensions Other benefits (in millions of Canadian dollars) 2016 2015 2016 2015 Pension asset $ 1,070 $ 1,401 $ — $ — Accounts payable and accrued liabilities (10 ) (10 ) (34 ) (34 ) Pension and other benefit liabilities (263 ) (285 ) (471 ) (473 ) Total amount recognized $ 797 $ 1,106 $ (505 ) $ (507 )
Amounts Recognized in Accumulated Other Comprehensive Losses	Amounts recognized in accumulated other comprehensive losses are as follows:   Pensions Other benefits (in millions of Canadian dollars) 2016 2015 2016 2015 Net actuarial loss:           Other than deferred investment gains $ 2,842 $ 3,144 $ 66 $ 77 Deferred investment gains (366 ) (1,101 ) — — Prior service cost (7 ) (20 ) 3 4 Deferred income tax (699 ) (580 ) (17 ) (20 ) Total (Note 7) $ 1,770 $ 1,443 $ 52 $ 61
Actuarial Assumptions Used Were Approximately	Weighted-average actuarial assumptions used were approximately: (percentages) 2016 2015 2014 Benefit obligation at December 31: Discount rate 4.02 4.22 4.09 Projected future salary increases 2.75 3.00 3.00 Health care cost trend rate 7.00 (1)  7.00 (2)  7.00 (2)  Benefit cost for year ended December 31: Discount rate 4.22 4.09 4.90 Expected rate of return on fund assets 7.75 7.75 7.75 Projected future salary increases 3.00 3.00 3.00 Health care cost trend rate 7.00 (2)  7.00 (2)  7.50 (3)  (1) The health care cost trend rate is assumed to be 7.00% in 2017 and 2018, and then decreasing by 0.50% per year to an ultimate rate of 5.00% per year in 2022 and thereafter. (2) The health care cost trend rate was previously assumed to be 6.50% in 2017 (7.00% in 2016 and 2015), and then decreasing by 0.50% per year to an ultimate rate of 5.00% per year in 2020 and thereafter. (3) For the 2014 benefit cost, the health care cost trend rate was assumed to be 6.00% in 2017 (6.50% in 2016, 7.00% in 2015, 7.50% in 2014), and then decreasing by 0.50% per year to an ultimate rate of 5.00% per year in 2019 and thereafter.
Summary of Pension Plan Asset Allocation and Current Weighted Average Policy Range	The Company’s pension plan asset allocation, the current weighted average asset allocation targets and the current weighted average policy range for each major asset class, were as follows:   Current asset allocation target Current policy range Percentage of plan assets at December 31 Asset allocation (percentage) 2016 2015 Cash and cash equivalents 0.5 0 – 5 1.1 1.1 Fixed income 29.5 20 – 40 21.4 21.0 Public equity 46.0 35 – 55 53.8 54.5 Real estate and infrastructure 12.0 4 – 20 7.5 5.8 Absolute return 12.0 0 – 18 16.2 17.6 Total 100.0 100.0 100.0
Summary of Defined Benefit Pension Plan Assets at Fair Value	The following is a summary of the assets of the Company’s DB pension plans at fair values at December 31, 2016 and 2015: (in millions of Canadian dollars) Quoted prices in active markets for identical assets (Level 1) Significant other observable inputs (Level 2) Significant unobservable inputs (Level 3) Investments measured at NAV(1) Total December 31, 2016           Cash and cash equivalents $ 121 $ 11 $ — $ — $ 132 Fixed income           • Government bonds(2) — 1,357 — — 1,357 • Corporate bonds(2) — 1,186 — — 1,186 • Mortgages(3) — 71 — — 71 Public equities         • Canada 1,480 57 — — 1,537 • U.S. and international 4,985 36 — — 5,021 Real estate(4) — — 437 188 625 Derivative assets(5) — 7 — — 7 Absolute return(6)         • Funds of hedge funds — — — 668 668 • Multi-strategy funds — — — 502 502 • Credit funds — — — 505 505 • Equity funds — — — 300 300 Infrastructure(7) — — — 285 285   $ 6,586 $ 2,725 $ 437 $ 2,448 $ 12,196 December 31, 2015           Cash and cash equivalents $ 129 $ 11 $ — $ — $ 140 Fixed income           • Government bonds(2) — 1,276 — — 1,276 • Corporate bonds(2) — 1,228 — — 1,228 • Mortgages(3) — 81 — — 81 Public equities         • Canada 1,449 46 — — 1,495 • U.S. and international 5,169 34 — — 5,203 Real estate(4) — — 451 — 451 Derivative assets(5) — — — — — Absolute return(6)           • Funds of hedge funds — — — 781 781 • Multi-strategy funds — — — 517 517 • Credit funds — — — 555 555 • Equity funds — — — 311 311 Infrastructure(7) — — — 262 262   $ 6,747 $ 2,676 $ 451 $ 2,426 $ 12,300 (1) Investments measured at net asset value ("NAV"): Amounts are comprised of certain investments measured at fair value using NAV (or its equivalent) as a practical expedient. These investments have not been classified in the fair value hierarchy. (2) Government & Corporate Bonds: Fair values for bonds are based on market prices supplied by independent sources as of the last trading day. (3) Mortgages: The fair value of mortgages of $71 million (2015 – $81 million) is based on current market yields of financial instruments of similar maturity, coupon and risk factors. (4) Real estate: The fair value of real estate investments of $437 million (2015 – $451 million) is based on property appraisals which use a number of approaches that typically include a discounted cash flow analysis, a direct capitalization income method and/or a direct comparison approach. Appraisals of real estate investments are generally performed semi-annually by qualified external accredited appraisers. There are $81 million of unfunded commitments for real estate investments as at December 31, 2016 (2015 – $278 million).   (5) Derivatives: The Company’s pension funds may utilize the following derivative instruments: equity futures to replicate equity index returns (Level 2); currency forwards to partially hedge foreign currency exposures (Level 2); bond forwards to reduce asset/liability interest rate risk exposures (Level 2); interest rate swaps to manage duration and interest rate risk (Level 2); credit default swaps to manage credit risk (Level 2); and options to manage interest rate risk and volatility (Level 2). There are currency forwards with a notional value of $937 million and a fair value of $7 million as at December 31, 2016 with maturities varying from three to fifteen months. These currency forwards reduce the funds' exposure to the U.S. dollar. (6) Absolute return: The fair value of absolute return fund investments of $1,975 million (2015 – $2,164 million) is based on the NAV reported by the fund administrators. The funds have different redemption policies and periods. There are no unfunded commitments for absolute return investments as at December 31, 2016 (2015 – $nil). - Funds of hedge funds invest in a portfolio of hedge funds that allocate capital across a broad array of funds and/or investment managers, with monthly redemptions upon 95 days' notice. - Multi-strategy funds include funds that invest in broadly diversified portfolios of equity, fixed income and derivative instruments with quarterly redemptions upon 60 days' notice. - Credit funds invest in an array of fixed income securities with quarterly redemptions upon 60 days' notice. - Equity funds invest primarily in U.S. and global equity securities. Redemptions range from quarterly upon 60 days' notice to triennially upon 45 days' notice. (7) Infrastructure: Infrastructure fund values of $285 million (2015 – $262 million) are based on the NAV of the funds that invest directly in infrastructure investments. The fair values of the investments have been estimated using the capital accounts representing the plans ownership interest in the funds. The investment in each fund is not subject to redemption and is normally returned through distributions as a result of the liquidation of the underlying infrastructure investments. It was estimated that the investments in these funds will be liquidated over the weighted-average period of approximately two years. As at December 31, 2016, unfunded commitments for infrastructure investments were $nil (2015 - $nil).
Summary of Defined Benefit Pension Plan Assets Measured at Fair Value Using Unobservable Inputs	During 2015 and 2016 the portion of the assets of the Company’s DB pension plans measured at fair value using unobservable inputs (Level 3) changed as follows: (in millions of Canadian dollars) Real Estate As at January 1, 2015 $ 654 Disbursements (223 ) Net realized gains 64 Decrease in net unrealized gains (44 ) As at December 31, 2015 $ 451 Disbursements (36 ) Net realized gains 24 Decrease in net unrealized gains (2 ) As at December 31, 2016 $ 437
Summary of Estimated Future Pension and Other Post-retirement Benefit Payments	The estimated future defined benefit pension and other benefit payments to be paid by the plans for each of the next five years and the subsequent five-year period are as follows: (in millions of Canadian dollars) Pensions Other benefits 2017 $ 616 $ 33 2018 626 32 2019 634 32 2020 641 31 2021 649 31 2022 – 2026 3,315 147