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Post-retirement Benefit Plans (Summary of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Net periodic benefit cost:    
Net periodic benefit cost $ 3 $ 7
Domestic defined benefit pension plans    
Net periodic benefit cost:    
Service cost 1 1
Interest cost 1 1
Expected return on plan assets (1) (2)
Amortization of net actuarial loss 0 1
Net periodic benefit cost 1 1
International defined benefit pension plans    
Net periodic benefit cost:    
Service cost 2 3
Interest cost 4 4
Expected return on plan assets (3) (4)
Amortization of net actuarial loss (1) 3
Net periodic benefit cost $ 2 $ 6