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Retirement Plans and Other Retiree Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Other Retiree Benefits        
Components of net periodic benefit cost        
Service cost $ 4 $ 3 $ 11 $ 11
Interest cost 15 9 35 28
Expected return on plan assets (2) (1) (3) (1)
Amortization of actuarial loss (gain) 4 2 9 11
Net periodic benefit cost 21 13 52 49
United States | Pension Benefits        
Components of net periodic benefit cost        
Service cost 1 0 1 1
Interest cost 22 21 68 64
Expected return on plan assets (29) (28) (78) (86)
Amortization of actuarial loss (gain) 14 12 39 35
Net periodic benefit cost 8 5 30 14
Voluntary benefit plan contribution     113 67
International | Pension Benefits        
Components of net periodic benefit cost        
Service cost 3 3 10 10
Interest cost 6 5 16 16
Expected return on plan assets (4) (5) (13) (16)
Amortization of actuarial loss (gain) 1 2 6 6
Net periodic benefit cost $ 6 $ 5 $ 19 $ 16