v3.26.1
Shareholders' Equity - Schedule of Changes in AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Movement in Accumulated Other Comprehensive Income [Roll Forward]    
Beginning Balance $ 14,853 $ 13,539
Other comprehensive income (loss), net of income taxes 0 (7)
Ending Balance 33,820 13,334
Accumulated Other Comprehensive Income (Loss), net    
Movement in Accumulated Other Comprehensive Income [Roll Forward]    
Beginning Balance (2,425) (2,302)
OCI before reclassifications (28) (26)
Amounts reclassified from AOCI 28 19
Other comprehensive income (loss), net of income taxes 0 (7)
Ending Balance (2,425) (2,309)
Gains (losses) on Cash Flow Hedges    
Movement in Accumulated Other Comprehensive Income [Roll Forward]    
Beginning Balance 1 (6)
OCI before reclassifications 0 0
Amounts reclassified from AOCI 1 2
Other comprehensive income (loss), net of income taxes 1 2
Ending Balance 2 (4)
Pension and OPEB Items    
Movement in Accumulated Other Comprehensive Income [Roll Forward]    
Beginning Balance (2,413) (2,262)
OCI before reclassifications (25) (34)
Amounts reclassified from AOCI 27 17
Other comprehensive income (loss), net of income taxes 2 (17)
Ending Balance (2,411) (2,279)
Foreign Currency Items    
Movement in Accumulated Other Comprehensive Income [Roll Forward]    
Beginning Balance (13) (34)
OCI before reclassifications (3) 8
Amounts reclassified from AOCI 0 0
Other comprehensive income (loss), net of income taxes (3) 8
Ending Balance $ (16) $ (26)