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Retirement Plans and Other Retiree Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Other Retiree Benefits    
Components of net periodic benefit cost    
Service cost $ 4 $ 4
Interest cost 10 11
Expected return on plan assets 0 0
Amortization of transition and prior service costs (credits) 0 0
Amortization of actuarial loss (gain) 4 4
Net periodic benefit cost 18 19
United States | Pension Benefits    
Components of net periodic benefit cost    
Service cost 0 0
Interest cost 21 24
Expected return on plan assets (29) (27)
Amortization of transition and prior service costs (credits) 0 0
Amortization of actuarial loss (gain) 12 12
Net periodic benefit cost 4 9
Voluntary benefit plan contribution 0 57
International | Pension Benefits    
Components of net periodic benefit cost    
Service cost 4 4
Interest cost 6 5
Expected return on plan assets (6) (5)
Amortization of transition and prior service costs (credits) 0 0
Amortization of actuarial loss (gain) 2 2
Net periodic benefit cost $ 6 $ 6