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Post-retirement Benefit Plans (Summary of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Net periodic benefit cost:        
Net periodic benefit cost $ 3 $ 147 $ 8 $ 161
Domestic defined benefit pension plans        
Net periodic benefit cost:        
Service cost 0 1 2 2
Interest cost 2   4 2
Expected return on plan assets (1) (1) (4) (4)
Amortization of net actuarial loss 0 1 0 2
Net periodic benefit cost 1 1 2 2
International defined benefit pension plans        
Net periodic benefit cost:        
Service cost 2 3 5 10
Interest cost 4 4 12 11
Expected return on plan assets (3) (4) (9) (11)
Amortization of net actuarial loss (1) 3 (2) 9
U.K. pension settlement expense 0 140 0 140
Net periodic benefit cost $ 2 $ 146 $ 6 $ 159