CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (AOCI) - Schedule of Pre-Tax and After-Tax (Details) - USD ($) $ in Millions		12 Months Ended
		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
Net unrealized gains (losses) on debt securities
Change in accumulated other comprehensive income (loss), pretax
Pretax		3,136	(7,178)	(5,301)
Change in accumulated other comprehensive income (loss), tax effect
Tax effect		(882)	1,794	1,367
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax		(5,998)	(614)	3,320
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), pretax
Pretax		(2,078)	2,685	296
Change in accumulated other comprehensive income (loss), tax effect
Tax effect		527	(656)	(64)
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax		842	(1,187)	(1,419)
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
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), pretax
Pretax		(353)	31	1,252
Change in accumulated other comprehensive income (loss), tax effect
Tax effect		58	66	(240)
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax		(5,755)	(5,852)	(6,864)
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
Change in accumulated other comprehensive income (loss), pretax
Pretax		665	(2,004)	(2,671)
Change in accumulated other comprehensive income (loss), tax effect
Tax effect		87	(467)	146
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax		(33,637)	(31,166)	(28,641)
Change, net of taxes		752	(2,471)	(2,525)
End of year balance, net of tax		(32,885)	(33,637)	(31,166)
CTA | 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 | 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)
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), pretax
AOCI, beginning balance, pretax		(55,253)	(45,383)	(36,992)
Pretax		2,792	(9,870)	(8,391)
AOCI, ending balance, pretax		(52,422)	(55,253)	(45,383)
Change in accumulated other comprehensive income (loss), tax effect
Balance, beginning of period, tax effect		8,191	6,618	4,934
Tax effect		(557)	1,573	1,684
Balance, end of period, tax effect		7,622	8,191	6,618
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax		(47,062)	(38,765)	(32,058)
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), pretax
AOCI, beginning balance, pretax		39
AOCI, ending balance, pretax			39
Change in accumulated other comprehensive income (loss), tax effect
Balance, beginning of period, tax effect		(12)
Balance, end of period, tax effect			(12)
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), pretax
AOCI, beginning balance, pretax		(55,214)
AOCI, ending balance, pretax			(55,214)
Change in accumulated other comprehensive income (loss), tax effect
Balance, beginning of period, tax effect		8,179
Balance, end of period, tax effect			8,179
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), pretax
Pretax		12	0	0
Change in accumulated other comprehensive income (loss), tax effect
Tax effect		(5)	0	0
Change in accumulated other comprehensive income (loss)
Beginning of year balance, net of tax		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
Cash flow hedges | Cash flow hedges
Change in accumulated other comprehensive income (loss), pretax
Pretax		1,480	(3,477)	(1,969)
Change in accumulated other comprehensive income (loss), tax effect
Tax effect		(364)	854	477
Change in accumulated other comprehensive income (loss)
Change, net of taxes		1,116	(2,623)	(1,492)
Fair value hedges | Excluded component of fair value hedges
Change in accumulated other comprehensive income (loss), pretax
Pretax		(70)	73	2
Change in accumulated other comprehensive income (loss), tax effect
Tax effect		22	(18)	(2)
Change in accumulated other comprehensive income (loss)
Change, net of taxes		$ (48)	$ 55	$ 0

[1] See Note 1 for additional details.