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, 2023	Dec. 31, 2022	Dec. 31, 2021
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax			$ 201,838	$ 202,672
End of year balance, net of tax			206,251	201,838	$ 202,672
Liability for insurance			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			(5,998)	(614)	3,320
Other comprehensive income before reclassifications			2,266	(5,599)	(3,556)
Increase (decrease) due to amounts reclassified from AOCI			(12)	215	(378)
Change, net of taxes			2,254	(5,384)	(3,934)
End of year balance, net of tax			(3,744)	(5,998)	(614)
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			842	(1,187)	(1,419)
Other comprehensive income before reclassifications			(1,553)	2,047	121
Increase (decrease) due to amounts reclassified from AOCI			2	(18)	111
Change, net of taxes			(1,551)	2,029	232
End of year balance, net of tax			(709)	842	(1,187)
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			(2,522)	101	1,593
Other comprehensive income before reclassifications			(327)	(2,718)	(679)
Increase (decrease) due to amounts reclassified from AOCI			1,443	95	(813)
Change, net of taxes			1,116	(2,623)	(1,492)
End of year balance, net of tax			(1,406)	(2,522)	101
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			(5,755)	(5,852)	(6,864)
Other comprehensive income before reclassifications			(416)	(19)	797
Increase (decrease) due to amounts reclassified from AOCI			121	116	215
Change, net of taxes			(295)	97	1,012
End of year balance, net of tax			(6,050)	(5,755)	(5,852)
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			(33,637)	(31,166)	(28,641)
Other comprehensive income before reclassifications			752	(2,855)	(2,537)
Increase (decrease) due to amounts reclassified from AOCI			0	384	12
Change, net of taxes			752	(2,471)	(2,525)
End of year balance, net of tax			(32,885)	(33,637)	(31,166)
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			8	(47)	(47)
Other comprehensive income before reclassifications			(16)	49	(11)
Increase (decrease) due to amounts reclassified from AOCI			(32)	6	11
Change, net of taxes			(48)	55	0
End of year balance, net of tax			(40)	8	(47)
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
Accumulated other comprehensive income (loss)
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax			(47,062)	(38,765)	(32,058)
Other comprehensive income before reclassifications			713	(9,095)	(5,865)
Increase (decrease) due to amounts reclassified from AOCI			1,522	798	(842)
Change, net of taxes			2,235	(8,297)	(6,707)
End of year balance, net of tax			(44,800)	(47,062)	(38,765)
Accumulated other comprehensive income (loss) | Cumulative effect of adoption
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax	[1]		27	0	0
End of year balance, net of tax	[1]			27	0
Accumulated other comprehensive income (loss) | Adjusted balance
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax			(47,035)	(38,765)	(32,058)
End of year balance, net of tax				(47,035)	(38,765)
Long-duration insurance contracts
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax			0	0	0
Other comprehensive income before reclassifications			7	0	0
Increase (decrease) due to amounts reclassified from AOCI			0	0	0
Change, net of taxes			7	0	0
End of year balance, net of tax			34	0	$ 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

[1] See Note 1 for additional details.