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Employee Benefit Plans Level 4 (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Pension Benefits [Member]        
Component of periodic benefit cost        
Defined Benefit Plan, Service Cost $ 1 $ 0 $ 2 $ 1
Interest cost 60 60 178 177
Expected return on plan assets (78) (77) (231) (233)
Amortization of prior service credit 0 0 0 0
Amortization of actuarial loss 15 16 42 45
Net periodic benefit cost (2) (1) (9) (10)
Other Postretirement Benefits [Member]        
Component of periodic benefit cost        
Defined Benefit Plan, Service Cost 0 0 0 0
Interest cost 2 3 8 9
Expected return on plan assets (2) (3) (7) (9)
Amortization of prior service credit 2 2 5 5
Amortization of actuarial loss 2 1 4 3
Net periodic benefit cost $ 0 $ (1) $ 0 $ (2)