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Benefit Plans - Pension Plans (Details) - Pension Plans - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]        
Curtailment credit $ (3)   $ (17)  
U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 $ 1 5 $ 4
Interest cost 10 12 30 38
Expected return on plan assets (18) (19) (54) (58)
Net loss from experience differences 4 5 13 13
Prior service cost/(benefit) 0 1 0 1
Curtailment credit [1] 0 0 0 0
Settlement losses and other expenses 5 3 14 15
Net periodic cost/(benefit) 2 3 8 13
Non-U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 29 30 99 89
Interest cost 39 37 98 110
Expected return on plan assets (106) (100) (319) (295)
Net loss from experience differences 32 29 98 86
Prior service cost/(benefit) (2) (2) (5) (5)
Curtailment credit [1] (3) 0 (17) 0
Settlement losses and other expenses 0 0 0 2
Net periodic cost/(benefit) (11) $ (6) (46) $ (13)
U.K.        
Defined Benefit Plan Disclosure [Line Items]        
Incentive payment charges and other expenses related to frozen benefit plan $ 2   $ 47  
[1] During the third quarter of 2021, we terminated our Defined Benefit Pension Scheme in Nigeria. During the second quarter of 2021, we made a decision to freeze our Defined Benefit Pension Scheme in the United Kingdom. As a result, we recognized curtailment credits of $(3 million) for the three months and $(17 million) for the nine months ended September 30, 2021 recorded within benefit plan non-service income. In connection with the United Kingdom plan freeze, we also incurred incentive payment charges and other expenses of $2 million for the three months and $47 million for the nine months ended September 30, 2021 included in operating income.