v3.26.3
OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period $ 32,665 $ 20,970 $ 24,379 $ 19,782
Other comprehensive income (loss) before reclassifications (765) 167 (1,061) 706
Amounts reclassified from AOCI to earnings 4 8 (5) 89
Other comprehensive income (loss) (761) 175 (1,066) 795
Balance, end of period 32,217 22,286 32,217 22,286
Reclassification out of Accumulated Other Comprehensive Income        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Debt securities transferred from available-for-sale     (39) (45)
AOCI        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (2,213) (2,246) (1,908) (2,866)
Other comprehensive income (loss) (761) 175 (1,066) 795
Balance, end of period (2,974) (2,071) (2,974) (2,071)
Unrealized gains (losses) on available-for-sale securities, net of hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (1,850) (2,013) (1,738) (2,365)
Other comprehensive income (loss) before reclassifications (522) 151 (617) 452
Amounts reclassified from AOCI to earnings 2 2 (15) 53
Other comprehensive income (loss) (520) 153 (632) 505
Balance, end of period (2,370) (1,860) (2,370) (1,860)
Net change related to cash flow hedges on loans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (167) (7) 27 (267)
Other comprehensive income (loss) before reclassifications (245) 17 (447) 247
Amounts reclassified from AOCI to earnings 2 6 10 36
Other comprehensive income (loss) (243) 23 (437) 283
Balance, end of period (410) 16 (410) 16
Translation adjustments, net of hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (5) (5) (4) (12)
Other comprehensive income (loss) before reclassifications 0 (1) (1) 6
Amounts reclassified from AOCI to earnings 0 0 0 0
Other comprehensive income (loss) 0 (1) (1) 6
Balance, end of period (5) (6) (5) (6)
Unrealized losses for pension and other post-retirement obligations        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (191) (221) (193) (222)
Other comprehensive income (loss) before reclassifications 2 0 4 1
Amounts reclassified from AOCI to earnings 0 0 0 0
Other comprehensive income (loss) 2 0 4 1
Balance, end of period $ (189) $ (221) $ (189) $ (221)