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Postretirement Benefit Plans (Components of Pension Plans) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other changes in plan assets and benefit obligations recognized in other comprehensive income      
Net loss $ (101) $ (51) $ 78
Prior service cost 0 0 5
Settlement (137) 0 0
Total recognized in comprehensive income (8) 2 (2)
Defined benefit pension plans      
Net periodic benefit cost:      
Net periodic benefit cost 165 31 31
Other changes in plan assets and benefit obligations recognized in other comprehensive income      
Change recognized in other comprehensive income (279) (83) 79
Total recognized in comprehensive income (114) (52) 110
United States      
Net periodic benefit cost:      
Service cost 3 3 3
Interest cost 3 3 3
Expected return on plan assets (6) (7) (7)
Amortization of net actuarial loss 3 4 3
Net periodic benefit cost 3 3 2
Other changes in plan assets and benefit obligations recognized in other comprehensive income      
Net loss 3 0 3
Amortization of net actuarial loss (3) (4) (3)
Change recognized in other comprehensive income 0 (4) 0
International defined benefit pension plans      
Net periodic benefit cost:      
Service cost 12 14 13
Interest cost 13 11 16
Expected return on plan assets (13) (14) (14)
Amortization of net actuarial loss 10 17 14
U.K. pension settlement expense 140 0 0
Net periodic benefit cost 162 28 29
Other changes in plan assets and benefit obligations recognized in other comprehensive income      
Net loss (95) (51) 74
Amortization of net actuarial loss (8) (17) (14)
Settlement (137) 0 0
Foreign Exchange (39) (11) 19
Change recognized in other comprehensive income $ (279) $ (79) $ 79