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Accumulated Other Comprehensive Income/Loss - Schedule of Reclassification (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net year-to-date other comprehensive income/(loss), taxes $ 6 $ 31 $ (92)
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 14,788 12,163 14,161
Other comprehensive income/(loss) before reclassifications (93) 79  
Amounts reclassified from accumulated other comprehensive income/(loss) (16) (111)  
Total other comprehensive income/(loss) [1] (109) (32) 332
Ending balance 16,890 14,788 12,163
Total      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (614) (582) (914)
Total other comprehensive income/(loss) (109) (32) 332
Ending balance (723) (614) (582)
Defined benefit plans      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (484) (378)  
Other comprehensive income/(loss) before reclassifications 2 5  
Amounts reclassified from accumulated other comprehensive income/(loss) (16) (111)  
Total other comprehensive income/(loss) (14) (106)  
Ending balance (498) (484) (378)
Foreign currency translation      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (146) (204)  
Other comprehensive income/(loss) before reclassifications (95) 58  
Amounts reclassified from accumulated other comprehensive income/(loss) 0 0  
Total other comprehensive income/(loss) (95) 58  
Ending balance (241) (146) (204)
Unrealized gain on derivative instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 16 0  
Other comprehensive income/(loss) before reclassifications 0 16  
Amounts reclassified from accumulated other comprehensive income/(loss) 0 0  
Total other comprehensive income/(loss) 0 16  
Ending balance $ 16 $ 16 $ 0
[1] Net of deferred taxes of $6 million, $31 million, and ($92) million during 2024, 2023, and 2022, respectively.