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Employee Benefit Plans - Postretirement (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Defined Benefit Plan Disclosure [Line Items]        
Net benefit cost $ 5 $ 1 $ 431 $ 2
Other Postretirement Benefit Plan, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 0 1 0 1
Prior service cost (benefit) (5) (4) (14) (13)
Actuarial loss 1 0 2 1
Net benefit cost (4) $ (3) (12) $ (11)
Defined Benefit Plan, Contributions by Employer 2   3  
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year $ 4   4  
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year     $ 1