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Retirement Plans and Other Retiree Benefits (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Other Retiree Benefits        
Components of net periodic benefit cost        
Service cost $ 7,000,000 $ 3,000,000 $ 20,000,000 $ 14,000,000
Interest cost 8,000,000 10,000,000 26,000,000 29,000,000
Expected return on plan assets 0 0 0 (1,000,000)
Amortization of actuarial loss (gain) 5,000,000 3,000,000 18,000,000 14,000,000
Net periodic benefit cost 20,000,000 16,000,000 64,000,000 56,000,000
United States | Pension Benefits        
Components of net periodic benefit cost        
Service cost 0 0 1,000,000 0
Interest cost 16,000,000 20,000,000 46,000,000 57,000,000
Expected return on plan assets (27,000,000) (29,000,000) (81,000,000) (83,000,000)
Amortization of actuarial loss (gain) 11,000,000 10,000,000 35,000,000 34,000,000
Net periodic benefit cost 0 1,000,000 1,000,000 8,000,000
Voluntary benefit plan contribution     0 0
International | Pension Benefits        
Components of net periodic benefit cost        
Service cost 3,000,000 4,000,000 11,000,000 11,000,000
Interest cost 5,000,000 5,000,000 14,000,000 14,000,000
Expected return on plan assets (4,000,000) (6,000,000) (14,000,000) (15,000,000)
Amortization of actuarial loss (gain) 2,000,000 2,000,000 8,000,000 7,000,000
Net periodic benefit cost $ 6,000,000 $ 5,000,000 $ 19,000,000 $ 17,000,000