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Pension and Other Postretirement Benefit Plans - Components of Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net (loss) gain arising during the period $ 110 $ 0 $ 156
Prior service cost arising during the period 0 0 0
Total 110 0 156
Net loss (gain) amortization included in benefit cost (42) (43) (42)
Prior service (credit) cost amortization included in benefit cost (49) (57) (63)
Settlements and curtailments (1) (1) (29)
Total (92) (101) (134)
United States | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net (loss) gain arising during the period (69) (42) 813
Prior service cost arising during the period 0 0 0
Total (69) (42) 813
Net loss (gain) amortization included in benefit cost 0 128 298
Prior service (credit) cost amortization included in benefit cost (1) (32) (38)
Settlements and curtailments 36 251 232
Total 35 347 492
International | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net (loss) gain arising during the period (438) 116 772
Prior service cost arising during the period (16) (4) (4)
Total (454) 112 768
Net loss (gain) amortization included in benefit cost (3) 96 142
Prior service (credit) cost amortization included in benefit cost 2 (14) (16)
Settlements and curtailments (6) 1 (18)
Total $ (7) $ 83 $ 108