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Retirement Plans and Other Retiree Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Other Retiree Benefits        
Components of net periodic benefit cost        
Service cost $ 3 $ 4 $ 11 $ 10
Interest cost 9 10 30 32
ESOP offset (1) 0 (1) (1)
Expected return on plan assets 0 0 0 0
Amortization of transition and prior service costs (credits) 0 0 0 0
Amortization of actuarial loss (gain) 1 3 9 11
Net periodic benefit cost 12 17 49 52
Pension Benefits, United States | Pension Benefits        
Components of net periodic benefit cost        
Service cost 0 0 1 1
Interest cost 23 27 70 80
ESOP offset 0 0 0 0
Expected return on plan assets (28) (27) (83) (82)
Amortization of transition and prior service costs (credits) 0 0 0 0
Amortization of actuarial loss (gain) 12 10 36 30
Net periodic benefit cost 7 10 24 29
Voluntary benefit plan contribution     81 53
Pension Benefits, International | Pension Benefits        
Components of net periodic benefit cost        
Service cost 4 4 11 12
Interest cost 6 7 16 19
ESOP offset 0 0 0 0
Expected return on plan assets (5) (6) (15) (17)
Amortization of transition and prior service costs (credits) 0 0 0 0
Amortization of actuarial loss (gain) 2 2 7 6
Net periodic benefit cost $ 7 $ 7 $ 19 $ 20