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Shareholders' Equity - Schedule of Changes in AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Movement in Accumulated Other Comprehensive Income [Roll Forward]    
Beginning balance $ 13,539 $ 11,286
Other comprehensive income (loss), net of income taxes (7) 11
Ending balance 13,334 11,560
Gains (losses) on Cash Flow Hedges    
Movement in Accumulated Other Comprehensive Income [Roll Forward]    
Beginning balance (6) (10)
OCI before reclassifications 0 0
Amounts reclassified from AOCI 2 0
Other comprehensive income (loss), net of income taxes 2 0
Ending balance (4) (10)
Pension and OPEB Items    
Movement in Accumulated Other Comprehensive Income [Roll Forward]    
Beginning balance (2,262) (2,157)
OCI before reclassifications (34) (3)
Amounts reclassified from AOCI 17 17
Other comprehensive income (loss), net of income taxes (17) 14
Ending balance (2,279) (2,143)
Foreign Currency Items    
Movement in Accumulated Other Comprehensive Income [Roll Forward]    
Beginning balance (34) (24)
OCI before reclassifications 8 (3)
Amounts reclassified from AOCI 0 0
Other comprehensive income (loss), net of income taxes 8 (3)
Ending balance (26) (27)
Total    
Movement in Accumulated Other Comprehensive Income [Roll Forward]    
Beginning balance (2,302) (2,191)
OCI before reclassifications (26) (6)
Amounts reclassified from AOCI 19 17
Other comprehensive income (loss), net of income taxes (7) 11
Ending balance $ (2,309) $ (2,180)