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

Reporting Entity [Axis]

0000004962 (http://www.sec.gov/CIK)

Income Taxes (Details) [Abstract]	Period [Axis]
	2016-12-31	2015-12-31
Income Taxes (Details) [Abstract]
Components of deferred tax assets and liabilities
Deferred tax assets:
Reserves not yet deducted for tax purposes	3,889,000,000	3,771,000,000
Employee compensation and benefits	595,000,000	648,000,000
Other	592,000,000	520,000,000
Gross deferred tax assets	5,076,000,000	4,939,000,000
Valuation allowance	(54,000,000)	(58,000,000)
Deferred tax assets after valuation allowance	5,022,000,000	4,881,000,000
Deferred tax liabilities:
Intangibles and fixed assets	1,691,000,000	1,547,000,000
Deferred revenue	441,000,000	509,000,000
Deferred interest	305,000,000	323,000,000
Asset Securitization	0	0
Investment in joint ventures	209,000,000	231,000,000
Foreign deferred tax liabilities	121,000,000	120,000,000
Gross deferred tax liabilities	2,767,000,000	2,730,000,000
Net deferred tax assets	2,255,000,000	2,151,000,000