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Retirement Plans and Other Retiree Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Other Retiree Benefits        
Components of net periodic benefit cost        
Service cost $ 4 $ 4 $ 8 $ 8
Interest cost 9 10 19 21
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) 5 4 9 8
Net periodic benefit cost 18 18 36 37
United States | Pension Benefits        
Components of net periodic benefit cost        
Service cost 1 1 1 1
Interest cost 22 23 43 47
Expected return on plan assets (29) (28) (58) (55)
Amortization of transition and prior service costs (credits) 0 0 0 0
Amortization of actuarial loss (gain) 11 12 23 24
Net periodic benefit cost 5 8 9 17
Voluntary benefit plan contribution     0 57
International | Pension Benefits        
Components of net periodic benefit cost        
Service cost 3 3 7 7
Interest cost 5 5 11 10
Expected return on plan assets (5) (5) (11) (10)
Amortization of transition and prior service costs (credits) 0 0 0 0
Amortization of actuarial loss (gain) 2 3 4 5
Net periodic benefit cost $ 5 $ 6 $ 11 $ 12