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Benefit Plans - Components of Net Periodic Pension Cost (Details) - Pension Plans - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Amortization:        
Curtailment expense/(credit) $ (17)      
U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost   $ 3 $ 5 $ 6
Interest cost   64 51 42
Expected return on plan assets   (99) (79) (72)
Amortization:        
Net loss   0 6 17
Prior service cost/(benefit)   1 1 1
Curtailment expense/(credit) [1]   0 0 0
Settlement losses and other expenses   17 14 19
Net periodic pension (benefit)/cost   (14) (2) 13
Non-U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost   54 88 137
Interest cost   303 172 130
Expected return on plan assets   (403) (353) (419)
Amortization:        
Net loss   42 57 130
Prior service cost/(benefit)   (1) (2) (6)
Curtailment expense/(credit) [1]   0 8 (17)
Settlement losses and other expenses   1 2 3
Net periodic pension (benefit)/cost   $ (4) $ (28) (42)
U.K.        
Amortization:        
Incentive payment charges and other expenses related to frozen benefit plan       $ 48
[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 ($17 million) in 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 $48 million in 2021 included in operating income.