CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (AOCI) - Change in Each Component of AOCI (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
		Jun. 30, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax			$ 206,251	$ 201,838
End of year balance, net of tax			209,366	206,251	$ 201,838
Liability for insurance			413	557
Discontinued Operations, Held-for-sale | Australia Consumer Banking Business
Change in accumulated other comprehensive income (loss)
Loss on sale of business, foreign currency translation adjustments, after-tax		$ 470
Loss on sale of business, foreign currency translation adjustments, pretax		$ 620
Net unrealized gains (losses) on debt securities
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax			(3,744)	(5,998)	(614)
Other comprehensive income before reclassifications			913	2,266	(5,599)
Increase (decrease) due to amounts reclassified from AOCI			(6)	(12)	215
Change, net of taxes			907	2,254	(5,384)
End of year balance, net of tax			(2,837)	(3,744)	(5,998)
Net unrealized gains (losses) on debt securities | Cumulative effect of adoption
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax				0
End of year balance, net of tax					0
Net unrealized gains (losses) on debt securities | Adjusted balance
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax				(5,998)
End of year balance, net of tax					(5,998)
Debt valuation adjustment (DVA)
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax			(709)	842	(1,187)
Other comprehensive income before reclassifications			(429)	(1,553)	2,047
Increase (decrease) due to amounts reclassified from AOCI			17	2	(18)
Change, net of taxes			(412)	(1,551)	2,029
End of year balance, net of tax			(1,121)	(709)	842
Debt valuation adjustment (DVA) | Cumulative effect of adoption
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax				0
End of year balance, net of tax					0
Debt valuation adjustment (DVA) | Adjusted balance
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax				842
End of year balance, net of tax					842
Cash flow hedges
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax			(1,406)	(2,522)	101
Other comprehensive income before reclassifications			405	(327)	(2,718)
Increase (decrease) due to amounts reclassified from AOCI			781	1,443	95
Change, net of taxes			1,186	1,116	(2,623)
End of year balance, net of tax			(220)	(1,406)	(2,522)
Cash flow hedges | Cumulative effect of adoption
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax				0
End of year balance, net of tax					0
Cash flow hedges | Adjusted balance
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax				(2,522)
End of year balance, net of tax					(2,522)
Benefit plans
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax			(6,050)	(5,755)	(5,852)
Other comprehensive income before reclassifications			242	(416)	(19)
Increase (decrease) due to amounts reclassified from AOCI			181	121	116
Change, net of taxes			423	(295)	97
End of year balance, net of tax			(5,627)	(6,050)	(5,755)
Benefit plans | Cumulative effect of adoption
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax				0
End of year balance, net of tax					0
Benefit plans | Adjusted balance
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax				(5,755)
End of year balance, net of tax					(5,755)
CTA, net of hedges
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax			(32,885)	(33,637)	(31,166)
Other comprehensive income before reclassifications			(5,162)	752	(2,855)
Increase (decrease) due to amounts reclassified from AOCI			0	0	384
Change, net of taxes			(5,162)	752	(2,471)
End of year balance, net of tax			(38,047)	(32,885)	(33,637)
CTA, net of hedges | Cumulative effect of adoption
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax				0
End of year balance, net of tax					0
CTA, net of hedges | Adjusted balance
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax				(33,637)
End of year balance, net of tax					(33,637)
Excluded component of fair value hedges
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax			(40)	8	(47)
Other comprehensive income before reclassifications			2	(16)	49
Increase (decrease) due to amounts reclassified from AOCI			(14)	(32)	6
Change, net of taxes			(12)	(48)	55
End of year balance, net of tax			(52)	(40)	8
Excluded component of fair value hedges | Cumulative effect of adoption
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax				0
End of year balance, net of tax					0
Excluded component of fair value hedges | Adjusted balance
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax				8
End of year balance, net of tax					8
Long-duration insurance contracts
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax			34	0	0
Other comprehensive income before reclassifications			19	7	0
Increase (decrease) due to amounts reclassified from AOCI			(1)	0	0
Change, net of taxes			18	7	0
End of year balance, net of tax			52	34	0
Long-duration insurance contracts | Cumulative effect of adoption
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax				27
End of year balance, net of tax					27
Long-duration insurance contracts | Adjusted balance
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax				27
End of year balance, net of tax					27
Accumulated other comprehensive income (loss)
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax			(44,800)	(47,062)	(38,765)
Other comprehensive income before reclassifications			(4,010)	713	(9,095)
Increase (decrease) due to amounts reclassified from AOCI			958	1,522	798
Change, net of taxes			(3,052)	2,235	(8,297)
End of year balance, net of tax			(47,852)	(44,800)	(47,062)
Accumulated other comprehensive income (loss) | Cumulative effect of adoption
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax	[1]		0	27	0
End of year balance, net of tax	[1]			0	27
Accumulated other comprehensive income (loss) | Adjusted balance
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax			$ (44,800)	(47,035)	(38,765)
End of year balance, net of tax				$ (44,800)	$ (47,035)

[1] See Note 1.