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 |