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Retirement Plans and Other Retiree Benefits (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Other Retiree Benefits    
Components of net periodic benefit cost    
Service cost $ 6,000,000 $ 6,000,000
Interest cost 9,000,000 11,000,000
Expected return on plan assets 0 0
Amortization of actuarial loss (gain) 6,000,000 5,000,000
Net periodic benefit cost 21,000,000 22,000,000
United States | Pension Benefits    
Components of net periodic benefit cost    
Service cost 0 0
Interest cost 15,000,000 19,000,000
Expected return on plan assets (27,000,000) (27,000,000)
Amortization of actuarial loss (gain) 13,000,000 11,000,000
Net periodic benefit cost 1,000,000 3,000,000
Voluntary benefit plan contribution 0 0
International | Pension Benefits    
Components of net periodic benefit cost    
Service cost 4,000,000 4,000,000
Interest cost 5,000,000 5,000,000
Expected return on plan assets (6,000,000) (4,000,000)
Amortization of actuarial loss (gain) 3,000,000 1,000,000
Net periodic benefit cost $ 6,000,000 $ 6,000,000