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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period     $ 17,731  
Other comprehensive income (loss) before reclassifications $ (310) $ (848) 20 $ (1,942)
Net unrealized gains (losses) on net investment hedges 59 64 72 73
Period change (251) (784) 92 (1,869)
Balance, end of period 18,788   18,788  
Unrealized gains and (losses) on debt securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (2,708) (1,332) (3,002) (153)
Other comprehensive income (loss) before reclassifications (217) (883) 75 (2,069)
Net unrealized gains (losses) on net investment hedges 27 63 29 70
Period change (190) (820) 104 (1,999)
Balance, end of period (2,898) (2,152) (2,898) (2,152)
Net impact of fair value hedges on available-for-sale securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period 614 421 754 89
Other comprehensive income (loss) before reclassifications 107 123 (33) 455
Net unrealized gains (losses) on net investment hedges 0 0 0
Period change 107 123 (33) 455
Balance, end of period 721 544 721 544
Net change related to cash flow hedges on loans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (443) (177) (632) 63
Other comprehensive income (loss) before reclassifications (201) (86) (23) (326)
Net unrealized gains (losses) on net investment hedges 32 0 43 0
Period change (169) (86) 20 (326)
Balance, end of period (612) (263) (612) (263)
Translation adjustments, net of hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (8) (3) (8) (3)
Other comprehensive income (loss) before reclassifications 1 (2) 1 (2)
Net unrealized gains (losses) on net investment hedges 0 0 0 0
Period change 1 (2) 1 (2)
Balance, end of period (7) (5) (7) (5)
Unrealized gains (losses) for pension and other post-retirement obligations        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (210) (223) (210) (225)
Other comprehensive income (loss) before reclassifications 0 0 0 0
Net unrealized gains (losses) on net investment hedges 0 1 0 3
Period change 0 1 0 3
Balance, end of period (210) (222) (210) (222)
AOCI        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance, beginning of period (2,755) (1,314) (3,098) (229)
Balance, end of period $ (3,006) $ (2,098) (3,006) (2,098)
Reclassification out of Accumulated Other Comprehensive Income        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Net unrealized loss on securities transfer     $ 62 $ 73