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Postretirement Benefit Plans (Components of Pension Plans) (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other changes in plan assets and benefit obligations recognized in other comprehensive income        
Net loss   $ 78 $ 83 $ 37
Prior service cost   5 0 0
Settlement   0 (9) (1)
Total recognized in comprehensive income   (2) 0 0
Defined benefit pension plans        
Net periodic benefit cost:        
Net periodic benefit cost   31 19 5
Other changes in plan assets and benefit obligations recognized in other comprehensive income        
Change recognized in other comprehensive income   79 69 12
Total recognized in comprehensive income   110 88 17
United States        
Net periodic benefit cost:        
Service cost   3 3 3
Interest cost   3 4 4
Expected return on plan assets   (7) (8) (7)
Amortization of net actuarial loss   3 1 2
Net periodic benefit cost   2 0 2
Other changes in plan assets and benefit obligations recognized in other comprehensive income        
Net loss   3 6 1
Amortization of net actuarial loss   (3) (1) (2)
Change recognized in other comprehensive income   0 5 (1)
International defined benefit pension plans        
Net periodic benefit cost:        
Service cost   13 9 9
Interest cost   16 19 19
Expected return on plan assets   (14) (27) (35)
Amortization of net actuarial loss   14 9 9
Settlement   0 9 1
Net periodic benefit cost   29 19 3
Other changes in plan assets and benefit obligations recognized in other comprehensive income        
Net loss   74 79 35
Prior service cost   0 0 (3)
Amortization of net actuarial loss   (14) (9) (9)
Settlement   0 (9) (1)
Foreign Exchange   19 3 (15)
Change recognized in other comprehensive income   $ 79 $ 64 $ 13
International defined benefit pension plans | Defined benefit pension plans        
Other changes in plan assets and benefit obligations recognized in other comprehensive income        
Net loss $ (11)