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Accumulated Other Comprehensive Loss - AOCI Activity (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period     $ 464  
Other comprehensive income (loss) before reclassifications     14  
Amounts reclassified from accumulated other comprehensive loss     62 $ 44
Other comprehensive income $ 32 $ 20 76 44
Balance at end of period (1,173) 342 (1,173) 342
Accumulated Other Comprehensive Loss        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (679) (786) (723) (810)
Other comprehensive income 32 20 76 44
Balance at end of period (647) (766) (647) (766)
Defined Benefit Plan | Pension Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period     (1,003) (1,045)
Other comprehensive income (loss) before reclassifications     0  
Amounts reclassified from accumulated other comprehensive loss     81 57
Other comprehensive income     81 57
Balance at end of period (922) (988) (922) (988)
Defined Benefit Plan | Post-Retirement Benefit Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period     320 276
Other comprehensive income (loss) before reclassifications     0  
Amounts reclassified from accumulated other comprehensive loss     (19) (13)
Other comprehensive income     (19) (13)
Balance at end of period 301 263 301 263
Foreign Currency Translation Adjustment and Other        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period     (40) (41)
Other comprehensive income (loss) before reclassifications     14  
Amounts reclassified from accumulated other comprehensive loss     0 0
Other comprehensive income     14 0
Balance at end of period $ (26) $ (41) $ (26) $ (41)