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, 2024
Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period $ 19,353  
Other comprehensive loss before reclassifications (256) $ 330
Net unrealized gains on net investment hedges 53 13
Period change (203) 343
Balance, end of period 19,322  
Unrealized gains and (losses) on debt securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period (2,094) (2,248)
Other comprehensive loss before reclassifications (130) 152
Net unrealized gains on net investment hedges 2 2
Period change (128) 154
Balance, end of period (2,222) (2,094)
Net change related to cash flow hedges on loans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period (363) (632)
Other comprehensive loss before reclassifications (124) 178
Net unrealized gains on net investment hedges 51 11
Period change (73) 189
Balance, end of period (436) (443)
Translation adjustments, net of hedges    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period (6) (8)
Other comprehensive loss before reclassifications (2) 0
Net unrealized gains on net investment hedges 0 0
Period change (2) 0
Balance, end of period (8) (8)
Unrealized gains (losses) for pension and other post-retirement obligations    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period (213) (210)
Other comprehensive loss before reclassifications 0 0
Net unrealized gains on net investment hedges 0 0
Period change 0 0
Balance, end of period (213) (210)
AOCI    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period (2,676) (3,098)
Balance, end of period (2,879) (2,755)
Reclassification out of Accumulated Other Comprehensive Income    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Net unrealized loss on securities transfer $ 56 $ 64