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DERIVATIVES - Cumulative Basis Adjustment (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Debt securities AFS, carrying amount of hedged asset $ 81,082 $ 94,659
Debt securities AFS, cumulative fair value hedging adjustment increasing (decreasing) the carrying amount, active 28 (114)
Debt securities AFS, cumulative fair value hedging adjustment increasing (decreasing) the carrying amount, de-designated 342 743
Long-term debt, carrying amount of hedged liability 169,026 157,387
Long-term debt, cumulative fair value hedging adjustment increasing (decreasing) the carrying amount, active 5,554 2,334
Long-term debt, cumulative fair value hedging adjustment increasing (decreasing) the carrying amount, de-designated 4,989 3,445
Cumulative basis adjustment within active hedges (18) (8)
Cumulative basis adjustment within de-designated hedges 62 157
Amount of designated hedged items 2,527 605
Carrying value of closed portfolios used in hedging relations $ 19,000 $ 20,000