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DERIVATIVES - Cumulative Basis Adjustment (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Debt securities AFS, carrying amount of hedged asset/liability $ 101,249 $ 62,733
Debt securities AFS, cumulative fair value hedging adjustment included in the carrying amount, active (1,137) 149
Debt securities AFS, cumulative fair value hedging adjustment included in the carrying amount, de-designated (270) 212
Long-term debt, carrying amount of hedged asset/liability 148,863 149,305
Long-term debt, cumulative fair value hedging adjustment included in the carrying amount, active (3,848) 623
Long-term debt, cumulative fair value hedging adjustment included in the carrying amount, de-designated (587) 3,936
Cumulative basis adjustment within active hedges (11) 24
Cumulative basis adjustment within de-designated hedges (228) (92)
Amount of designated hedged items 3,000 6,000
Amortized cost basis of closed portfolios used in hedging relations $ 11,000 $ 25,000