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Employee Benefit Plans Level 4 (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Pension Benefits [Member]        
Component of periodic benefit cost        
Defined Benefit Plan, Service Cost $ 1 $ 1 $ 1 $ 1
Interest cost 58 63 117 127
Expected return on plan assets (78) (82) (156) (163)
Amortization of prior service credit 0 0 0 0
Amortization of actuarial loss 14 11    
Net periodic benefit cost (5) (7) (9) (13)
Defined Benefit Plan, Amortization of Gains (Losses)     (29) (22)
Other Postretirement Benefits [Member]        
Component of periodic benefit cost        
Defined Benefit Plan, Service Cost 0 0 0 0
Interest cost 3 3 6 6
Expected return on plan assets (3) (4) (6) (8)
Amortization of prior service credit (1) (1) (3) (3)
Amortization of actuarial loss 1 1    
Net periodic benefit cost $ 0 $ (1) (1) (3)
Defined Benefit Plan, Amortization of Gains (Losses)     $ (2) $ (2)