DERIVATIVES - Fair Value Hedges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Gain (loss) on fair value hedges
Gain (loss) on derivatives, mark to market approach	$ 86
Gain (loss) on derivatives, amortization approach	8
Other revenue
Gain (loss) on fair value hedges
Gain (loss) on the hedging derivatives included in assessment of the effectiveness of fair value hedges	(3,245)	$ (4,610)	$ 1,278
Gain (loss) on the hedged item in designated and qualifying fair value hedges	3,242	4,601	(1,278)
Net gain (loss) on the hedging derivatives excluded from assessment of the effectiveness of fair value hedges	265	84	58
Net interest income
Gain (loss) on fair value hedges
Gain (loss) on the hedging derivatives included in assessment of the effectiveness of fair value hedges	(8,322)	(5,425)	4,189
Gain (loss) on the hedged item in designated and qualifying fair value hedges	8,087	5,043	(4,537)
Net gain (loss) on the hedging derivatives excluded from assessment of the effectiveness of fair value hedges	0	(9)	(23)
Interest rate hedges | Other revenue
Gain (loss) on fair value hedges
Gain (loss) on the hedging derivatives included in assessment of the effectiveness of fair value hedges	0	0	0
Gain (loss) on the hedged item in designated and qualifying fair value hedges	0	0	0
Net gain (loss) on the hedging derivatives excluded from assessment of the effectiveness of fair value hedges	0	0	0
Interest rate hedges | Net interest income
Gain (loss) on fair value hedges
Gain (loss) on the hedging derivatives included in assessment of the effectiveness of fair value hedges	(8,322)	(5,425)	4,189
Gain (loss) on the hedged item in designated and qualifying fair value hedges	8,087	5,043	(4,537)
Net gain (loss) on the hedging derivatives excluded from assessment of the effectiveness of fair value hedges	0	(9)	(23)
Foreign exchange contracts
Gain (loss) on fair value hedges
Cross-currency basis included in accumulated other comprehensive income	73	2
Foreign exchange contracts | Other revenue
Gain (loss) on fair value hedges
Gain (loss) on the hedging derivatives included in assessment of the effectiveness of fair value hedges	(1,375)	(627)	1,442
Gain (loss) on the hedged item in designated and qualifying fair value hedges	1,372	628	(1,442)
Net gain (loss) on the hedging derivatives excluded from assessment of the effectiveness of fair value hedges	171	79	(73)
Foreign exchange contracts | Net interest income
Gain (loss) on fair value hedges
Gain (loss) on the hedging derivatives included in assessment of the effectiveness of fair value hedges	0	0	0
Gain (loss) on the hedged item in designated and qualifying fair value hedges	0	0	0
Net gain (loss) on the hedging derivatives excluded from assessment of the effectiveness of fair value hedges	0	0	0
Commodity hedges | Other revenue
Gain (loss) on fair value hedges
Gain (loss) on the hedging derivatives included in assessment of the effectiveness of fair value hedges	(1,870)	(3,983)	(164)
Gain (loss) on the hedged item in designated and qualifying fair value hedges	1,870	3,973	164
Net gain (loss) on the hedging derivatives excluded from assessment of the effectiveness of fair value hedges	94	5	131
Commodity hedges | Net interest income
Gain (loss) on fair value hedges
Gain (loss) on the hedging derivatives included in assessment of the effectiveness of fair value hedges	0	0	0
Gain (loss) on the hedged item in designated and qualifying fair value hedges	0	0	0
Net gain (loss) on the hedging derivatives excluded from assessment of the effectiveness of fair value hedges	$ 0	$ 0	$ 0