DERIVATIVES - Cash Flow Hedges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Pretax change in accumulated other comprehensive income (loss)
Amount of gain (loss) recognized in AOCI on derivative	$ (87)	$ (384)	$ (348)	$ (45)
Amount of gain (loss) reclassified from AOCI to earnings	(131)	(213)	(488)	(817)
Cash flow hedge gain expected to be reclassified from AOCI within 12 months			$ (100)
Maximum length of time hedged in cash flow hedge			13 years
Cash flow hedges
Pretax change in accumulated other comprehensive income (loss)
Net pretax change in cash flow hedges included within AOCI	44	(171)	$ 140	772
Interest rate contracts
Pretax change in accumulated other comprehensive income (loss)
Amount of gain (loss) recognized in AOCI on derivative	(75)	(378)	(336)	(38)
Amount of gain (loss) reclassified from AOCI to earnings	(125)	(212)	(482)	(814)
Foreign exchange contracts
Pretax change in accumulated other comprehensive income (loss)
Amount of gain (loss) recognized in AOCI on derivative	(12)	(6)	(12)	(7)
Amount of gain (loss) reclassified from AOCI to earnings	$ (6)	$ (1)	$ (6)	$ (3)