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401900 - Disclosure - Employee Benefit Plans - Change in Benefit Obligations (Details)
(http://conocophillips.com/role/DisclosureEmployeeBenefitPlansChangeInBenefitObligationsDetails)
TableSchedule of Defined Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001163165 (http://www.sec.gov/CIK)
Defined Benefit Plan Disclosure [Line Items]Period [Axis]
2013-01-01 - 2013-12-31
2012-01-01 - 2012-12-31
2011-01-01 - 2011-12-31
Defined Benefit Plans Disclosures, Defined Benefit Plans [Axis]Defined Benefit Plans Disclosures, Defined Benefit Plans [Axis]Defined Benefit Plans Disclosures, Defined Benefit Plans [Axis]
United States Pension Plans of US Entity, Defined Benefit [Member]Foreign Pension Plans, Defined Benefit [Member]Other Postretirement Benefit Plans, Defined Benefit [Member]United States Pension Plans of US Entity, Defined Benefit [Member]Foreign Pension Plans, Defined Benefit [Member]Other Postretirement Benefit Plans, Defined Benefit [Member]United States Pension Plans of US Entity, Defined Benefit [Member]Foreign Pension Plans, Defined Benefit [Member]Other Postretirement Benefit Plans, Defined Benefit [Member]
Pension and Postretirement Plans
 
 
 
 
 
 
 
 
 
Change in Benefit Obligation
 
 
 
 
 
 
 
 
 
Benefit obligation at January 1
4,225,000,000 1
3,438,000,000 1
765,000,000  
6,175,000,000  
3,484,000,000  
926,000,000  
 
 
 
Service cost
138,000,000  
102,000,000  
3,000,000  
170,000,000  
91,000,000  
6,000,000  
225,000,000  
98,000,000  
10,000,000  
Interest cost
143,000,000  
145,000,000  
26,000,000  
186,000,000  
152,000,000  
33,000,000  
247,000,000  
178,000,000  
42,000,000  
Plan participant contributions
 
6,000,000  
22,000,000  
 
7,000,000  
23,000,000  
 
 
 
Government subsidy
 
 
 
 
 
 
 
 
 
Separation of Downstream Business
 
 
 
(2,464,000,000) 
(653,000,000) 
(199,000,000) 
 
 
 
Plan amendments
 
 
 
 
 
 
 
 
 
Actuarial (gain) loss
(205,000,000) 
72,000,000  
(57,000,000) 
735,000,000  
297,000,000  
47,000,000  
 
 
 
Benefits paid
(347,000,000) 
(110,000,000) 
(75,000,000) 
(577,000,000) 
(113,000,000) 
(72,000,000) 
 
 
 
Curtailment
 
 
 
 
 
 
 
 
 
Foreign currency exchange rate change
 
(70,000,000) 
(2,000,000) 
 
173,000,000  
1,000,000  
 
 
 
Benefit obligation at December 31
3,954,000,000 1
 
3,583,000,000 1
 
682,000,000  
 
4,225,000,000 1
 
3,438,000,000 1
 
765,000,000  
 
6,175,000,000  
 
3,484,000,000  
 
926,000,000  
 
Accumulated benefit at year end
3,516,000,000  
2,798,000,000  
 
3,710,000,000  
2,972,000,000  
 
 
 
 
1: *Accumulated benefit obligation portion of above at December 31: $3,516, $2,798, $3,710, $2,972