Quarterly report pursuant to Section 13 or 15(d)

OTHER COMPREHENSIVE INCOME OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details)

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OTHER COMPREHENSIVE INCOME OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period     $ 17,731  
Other comprehensive income (loss) before reclassifications $ (661) $ (1,184) (641) $ (3,126)
Net unrealized gains (losses) on net investment hedges 45 6 117 79
Period change (616) (1,178) (524) (3,047)
Balance, end of period 18,483   18,483  
Unrealized gains and (losses) on debt securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (2,898) (2,152) (3,002) (153)
Other comprehensive income (loss) before reclassifications (636) (974) (561) (3,043)
Net unrealized gains (losses) on net investment hedges 3 3 32 73
Period change (633) (971) (529) (2,970)
Balance, end of period (3,531) (3,123) (3,531) (3,123)
Net impact of fair value hedges on available-for-sale securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period 721 544 754 89
Other comprehensive income (loss) before reclassifications 67 250 34 705
Net unrealized gains (losses) on net investment hedges 0 0 0
Period change 67 250 34 705
Balance, end of period 788 794 788 794
Net change related to cash flow hedges on loans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (612) (263) (632) 63
Other comprehensive income (loss) before reclassifications (91) (456) (114) (782)
Net unrealized gains (losses) on net investment hedges 41 0 84 0
Period change (50) (456) (30) (782)
Balance, end of period (662) (719) (662) (719)
Translation adjustments, net of hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (7) (5) (8) (3)
Other comprehensive income (loss) before reclassifications (1) (4) 0 (6)
Net unrealized gains (losses) on net investment hedges 0 0 0 0
Period change (1) (4) 0 (6)
Balance, end of period (8) (9) (8) (9)
Unrealized gains (losses) for pension and other post-retirement obligations        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (210) (222) (210) (225)
Other comprehensive income (loss) before reclassifications 0 0 0 0
Net unrealized gains (losses) on net investment hedges 1 3 1 6
Period change 1 3 1 6
Balance, end of period (209) (219) (209) (219)
AOCI        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (3,006) (2,098) (3,098) (229)
Balance, end of period $ (3,622) $ (3,276) (3,622) (3,276)
Reclassification out of Accumulated Other Comprehensive Income        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Net unrealized loss on securities transfer     $ 60 $ 69