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Benefit Plans - Changes in Level 3 Plan Assets (Details) - Significant Unobservable Inputs (Level 3) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning balance $ 1,614 $ 2,466
Net Realized and Unrealized Gains/ (Losses) 58 (447)
Net Purchases, Issuances and Settlements (227) (149)
Net Transfers Into/(Out of) Level 3 0 0
Currency Impact 91 (256)
Ending balance 1,536 1,614
Corporate bonds and other fixed-income securities    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning balance 1,540 2,387
Net Realized and Unrealized Gains/ (Losses) 60 (450)
Net Purchases, Issuances and Settlements (227) (148)
Net Transfers Into/(Out of) Level 3 0 0
Currency Impact 98 (249)
Ending balance 1,471 1,540
Real estate    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning balance 70 74
Net Realized and Unrealized Gains/ (Losses) (2) 3
Net Purchases, Issuances and Settlements 0 (1)
Net Transfers Into/(Out of) Level 3 0 0
Currency Impact (6) (6)
Ending balance 62 70
Private equity and other    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning balance 4 5
Net Realized and Unrealized Gains/ (Losses) 0 0
Net Purchases, Issuances and Settlements 0 0
Net Transfers Into/(Out of) Level 3 0 0
Currency Impact (1) (1)
Ending balance $ 3 $ 4