v3.26.1
Accumulated Other Comprehensive Income - Changes in AOCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 18,176 $ 14,637 $ 13,454
Other comprehensive income before reclassification, net of income taxes 1,233 (222) 320
Amounts reclassified from accumulated other comprehensive income, net of income taxes 277 1,981 746
Total other comprehensive income (loss), net of tax 1,510 1,759 1,066
Ending balance 20,381 18,176 14,637
Unrealized gains (losses) on securities available for sale      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (2,734) (4,190) (4,895)
Other comprehensive income before reclassification, net of income taxes 1,018 38 702
Amounts reclassified from accumulated other comprehensive income, net of income taxes 0 1,418 3
Total other comprehensive income (loss), net of tax 1,018 1,456 705
Ending balance (1,716) (2,734) (4,190)
Unrealized gains (losses) on derivative financial instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (434) (763) (1,124)
Other comprehensive income before reclassification, net of income taxes 154 (230) (364)
Amounts reclassified from accumulated other comprehensive income, net of income taxes 273 559 725
Total other comprehensive income (loss), net of tax 427 329 361
Ending balance (7) (434) (763)
Net pension and postretirement benefit costs      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (302) (276) (276)
Other comprehensive income before reclassification, net of income taxes 61 (30) (18)
Amounts reclassified from accumulated other comprehensive income, net of income taxes 4 4 18
Total other comprehensive income (loss), net of tax 65 (26) 0
Ending balance (237) (302) (276)
Total      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (3,470) (5,229) (6,295)
Ending balance $ (1,960) $ (3,470) $ (5,229)