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Post-retirement Benefit Plans (Summary of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net periodic benefit cost:        
Net periodic benefit cost $ 8 $ 7 $ 16 $ 14
Domestic defined benefit pension plans        
Net periodic benefit cost:        
Service cost 0 1 1 2
Interest cost 1 1 2 2
Expected return on plan assets (1) (2) (3) (4)
Amortization of net actuarial loss 1 1 2 2
Net periodic benefit cost 1 1 2 2
International defined benefit pension plans        
Net periodic benefit cost:        
Service cost 3 3 7 6
Interest cost 3 3 6 6
Expected return on plan assets (3) (3) (7) (6)
Amortization of net actuarial loss 4 3 8 6
Net periodic benefit cost $ 7 $ 6 $ 14 $ 12