Quarterly report pursuant to Section 13 or 15(d)

OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details)

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OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period     $ 19,353  
Other comprehensive income before reclassifications $ 761 $ (661) 418 $ (641)
Net unrealized gains on net investment hedges 46 45 154 117
Other comprehensive income (loss), net of tax 807 (616) 572 (524)
Balance, end of period 20,606   20,606  
Unrealized gains and (losses) on debt securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (2,292) (2,177) (2,094) (2,248)
Other comprehensive income before reclassifications 442 (569) 240 (527)
Net unrealized gains on net investment hedges 3 3 7 32
Other comprehensive income (loss), net of tax 445 (566) 247 (495)
Balance, end of period (1,847) (2,743) (1,847) (2,743)
Net change related to cash flow hedges on loans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (399) (612) (363) (632)
Other comprehensive income before reclassifications 317 (91) 178 (114)
Net unrealized gains on net investment hedges 43 41 146 84
Other comprehensive income (loss), net of tax 360 (50) 324 (30)
Balance, end of period (39) (662) (39) (662)
Translation adjustments, net of hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (8) (7) (6) (8)
Other comprehensive income before reclassifications 2 (1) 0 0
Net unrealized gains on net investment hedges 0 0 0 0
Other comprehensive income (loss), net of tax 2 (1) 0 0
Balance, end of period (6) (8) (6) (8)
Unrealized gains (losses) for pension and other post-retirement obligations        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (212) (210) (213) (210)
Other comprehensive income before reclassifications 0 0 0 0
Net unrealized gains on net investment hedges 0 1 1 1
Other comprehensive income (loss), net of tax 0 1 1 1
Balance, end of period (212) (209) (212) (209)
AOCI        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (2,911) (3,006) (2,676) (3,098)
Balance, end of period $ (2,104) $ (3,622) (2,104) (3,622)
Reclassification out of Accumulated Other Comprehensive Income        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Net unrealized loss on securities transfer     $ 52 $ 60