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Retirement Plans and Other Retiree Benefits (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Other Retiree Benefits        
Components of net periodic benefit cost        
Service cost $ 7,000,000 $ 5,000,000 $ 13,000,000 $ 11,000,000
Interest cost 9,000,000 8,000,000 18,000,000 19,000,000
Expected return on plan assets 0 (1,000,000) 0 (1,000,000)
Amortization of actuarial loss (gain) 7,000,000 6,000,000 13,000,000 11,000,000
Net periodic benefit cost 23,000,000 18,000,000 44,000,000 40,000,000
United States | Pension Benefits        
Components of net periodic benefit cost        
Service cost 1,000,000 0 1,000,000 0
Interest cost 15,000,000 18,000,000 30,000,000 37,000,000
Expected return on plan assets (26,000,000) (27,000,000) (53,000,000) (54,000,000)
Amortization of actuarial loss (gain) 10,000,000 13,000,000 23,000,000 24,000,000
Net periodic benefit cost 0 4,000,000 1,000,000 7,000,000
Voluntary benefit plan contribution     0 0
International | Pension Benefits        
Components of net periodic benefit cost        
Service cost 4,000,000 3,000,000 8,000,000 7,000,000
Interest cost 4,000,000 4,000,000 9,000,000 9,000,000
Expected return on plan assets (4,000,000) (5,000,000) (10,000,000) (9,000,000)
Amortization of actuarial loss (gain) 3,000,000 4,000,000 6,000,000 5,000,000
Net periodic benefit cost $ 7,000,000 $ 6,000,000 $ 13,000,000 $ 12,000,000