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DERIVATIVES - Cash Flow Hedges (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pretax change in accumulated other comprehensive income (loss)      
Total gain (loss) recognized in AOCI $ (3,606) $ (898) $ 2,655
Other revenue (21) 1,165 420
Net interest revenue 48,668 42,494 44,751
Cash flow hedges expected to be reclassified within 12 months $ (1,700)    
Maximum length of time hedged in cash flow hedge 10 years    
Interest rate contracts      
Pretax change in accumulated other comprehensive income (loss)      
Total gain (loss) recognized in AOCI $ (3,640) (847) 2,670
Foreign exchange contracts      
Pretax change in accumulated other comprehensive income (loss)      
Total gain (loss) recognized in AOCI 34 (51) (15)
Cash flow hedges      
Pretax change in accumulated other comprehensive income (loss)      
Net interest revenue (3,477) (1,969) 1,925
Amount of gain (loss) reclassified from AOCI to earnings | Cash flow hedges      
Pretax change in accumulated other comprehensive income (loss)      
Other revenue (4) (4) (4)
Net interest revenue (125) 1,075 734
Amount of gain (loss) reclassified from AOCI to earnings | Cash flow hedges | Interest rate contracts      
Pretax change in accumulated other comprehensive income (loss)      
Other revenue 0 0 0
Net interest revenue (125) 1,075 734
Amount of gain (loss) reclassified from AOCI to earnings | Cash flow hedges | Foreign exchange contracts      
Pretax change in accumulated other comprehensive income (loss)      
Other revenue (4) (4) (4)
Net interest revenue $ 0 $ 0 $ 0