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FINANCIAL INSTRUMENTS - Fair Value Hedges (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Cumulative amount of fair value hedging adjustments $ 6,203 $ 5,118
Cumulative amount of fair value hedging on discontinued hedging relationships 2,346 2,484
Hedged liability $ 33,434 $ 44,558