DERIVATIVES - Fair Value Hedges (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Gain (loss) on fair value hedges
Gain (loss) under mark-to-market approach	$ 45	$ 50
Gain (loss) under amortization approach	4	(1)
Other revenue
Gain (loss) on fair value hedges
Gain (loss) on the hedging derivatives included in assessment of the effectiveness of fair value hedges	40	447
Gain (loss) on the hedged item in designated and qualifying fair value hedges	(40)	(448)
Net gain (loss) on the hedging derivatives excluded from assessment of the effectiveness of fair value hedges	71	80
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	(1)	(4,666)
Gain (loss) on the hedged item in designated and qualifying fair value hedges	(7)	4,597
Net gain (loss) on the hedging derivatives excluded from assessment of the effectiveness of fair value hedges	0	(6)
Interest rate contracts (gross) | 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
Gain (loss) on the hedged item in designated and qualifying fair value hedges	0	0
Net gain (loss) on the hedging derivatives excluded from assessment of the effectiveness of fair value hedges	0	0
Interest rate contracts (gross) | 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	(1)	(4,666)
Gain (loss) on the hedged item in designated and qualifying fair value hedges	(7)	4,597
Net gain (loss) on the hedging derivatives excluded from assessment of the effectiveness of fair value hedges	0	(6)
Foreign exchange contracts (gross)
Gain (loss) on fair value hedges
Gain (loss) of cross currency basis included in AOCI	(26)	64
Foreign exchange contracts (gross) | Other revenue
Gain (loss) on fair value hedges
Gain (loss) on the hedging derivatives included in assessment of the effectiveness of fair value hedges	548	(425)
Gain (loss) on the hedged item in designated and qualifying fair value hedges	(548)	424
Net gain (loss) on the hedging derivatives excluded from assessment of the effectiveness of fair value hedges	22	31
Foreign exchange contracts (gross) | 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
Gain (loss) on the hedged item in designated and qualifying fair value hedges	0	0
Net gain (loss) on the hedging derivatives excluded from assessment of the effectiveness of fair value hedges	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	(508)	872
Gain (loss) on the hedged item in designated and qualifying fair value hedges	508	(872)
Net gain (loss) on the hedging derivatives excluded from assessment of the effectiveness of fair value hedges	49	49
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
Gain (loss) on the hedged item in designated and qualifying fair value hedges	0	0
Net gain (loss) on the hedging derivatives excluded from assessment of the effectiveness of fair value hedges	$ 0	$ 0