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
Mar. 31, 2023
Mar. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period $ 17,731  
Other comprehensive income (loss) before reclassifications 330 $ (1,094)
Net unrealized gains (losses) on net investment hedges 13 9
Period change 343 (1,085)
Balance, end of period 18,758  
Unrealized gains and (losses) on debt securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period (3,002) (153)
Other comprehensive income (loss) before reclassifications 292 (1,186)
Net unrealized gains (losses) on net investment hedges 2 7
Period change 294 (1,179)
Balance, end of period (2,708) (1,332)
Net impact of fair value hedges on available-for-sale securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period 754 89
Other comprehensive income (loss) before reclassifications (140) 332
Net unrealized gains (losses) on net investment hedges 0 0
Period change (140) 332
Balance, end of period 614 421
Net change related to cash flow hedges on loans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period (632) 63
Other comprehensive income (loss) before reclassifications 178 (240)
Net unrealized gains (losses) on net investment hedges 11 0
Period change 189 (240)
Balance, end of period (443) (177)
Translation adjustments, net of hedges    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period (8) (3)
Other comprehensive income (loss) before reclassifications 0 0
Net unrealized gains (losses) on net investment hedges 0 0
Period change 0 0
Balance, end of period (8) (3)
Unrealized gains (losses) for pension and other post-retirement obligations    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period (210) (225)
Other comprehensive income (loss) before reclassifications 0 0
Net unrealized gains (losses) on net investment hedges 0 2
Period change 0 2
Balance, end of period (210) (223)
AOCI    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period (3,098) (229)
Balance, end of period (2,755) (1,314)
Reclassification out of Accumulated Other Comprehensive Income    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Net unrealized loss on securities transfer $ 64 $ 78