CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (AOCI) - Change in Each Component of AOCI (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Change in accumulated other comprehensive income (loss)
Balance, beginning of period				$ 201,838
Balance, end of period		$ 210,195	$ 199,117	210,195	$ 199,117
Liability for future policyholder benefits		519		519
Net unrealized gains (losses) on debt securities
Change in accumulated other comprehensive income (loss)
Balance, beginning of period		(5,036)	(6,392)	(5,998)	(614)
Other comprehensive income before reclassifications		(176)	(595)	812	(6,490)
Increase (decrease) due to amounts reclassified from AOCI		7	15	(19)	132
Total other comprehensive income		(169)	(580)	793	(6,358)
Balance, end of period		(5,205)	(6,972)	(5,205)	(6,972)
Net unrealized gains (losses) on debt securities | Cumulative Effect, Period of Adoption, Adjustment
Change in accumulated other comprehensive income (loss)
Balance, beginning of period				0
Net unrealized gains (losses) on debt securities | Cumulative Effect, Period of Adoption, Adjusted Balance
Change in accumulated other comprehensive income (loss)
Balance, beginning of period				(5,998)
Debt valuation adjustment (DVA)
Change in accumulated other comprehensive income (loss)
Balance, beginning of period		(102)	1,573	842	(1,187)
Other comprehensive income before reclassifications		290	874	(650)	3,635
Increase (decrease) due to amounts reclassified from AOCI		9	(2)	5	(3)
Total other comprehensive income		299	872	(645)	3,632
Balance, end of period		197	2,445	197	2,445
Debt valuation adjustment (DVA) | Cumulative Effect, Period of Adoption, Adjustment
Change in accumulated other comprehensive income (loss)
Balance, beginning of period				0
Debt valuation adjustment (DVA) | Cumulative Effect, Period of Adoption, Adjusted Balance
Change in accumulated other comprehensive income (loss)
Balance, beginning of period				842
Cash flow hedges
Change in accumulated other comprehensive income (loss)
Balance, beginning of period		(1,990)	(2,106)	(2,522)	101
Other comprehensive income before reclassifications		366	(870)	166	(2,709)
Increase (decrease) due to amounts reclassified from AOCI		365	107	1,097	(261)
Total other comprehensive income		731	(763)	1,263	(2,970)
Balance, end of period		(1,259)	(2,869)	(1,259)	(2,869)
Cash flow hedges | Cumulative Effect, Period of Adoption, Adjustment
Change in accumulated other comprehensive income (loss)
Balance, beginning of period				0
Cash flow hedges | Cumulative Effect, Period of Adoption, Adjusted Balance
Change in accumulated other comprehensive income (loss)
Balance, beginning of period				(2,522)
Benefit plans
Change in accumulated other comprehensive income (loss)
Balance, beginning of period		(5,995)	(5,770)	(5,755)	(5,852)
Other comprehensive income before reclassifications		274	5	(28)	26
Increase (decrease) due to amounts reclassified from AOCI		38	32	100	93
Total other comprehensive income		312	37	72	119
Balance, end of period		(5,683)	(5,733)	(5,683)	(5,733)
Benefit plans | Cumulative Effect, Period of Adoption, Adjustment
Change in accumulated other comprehensive income (loss)
Balance, beginning of period				0
Benefit plans | Cumulative Effect, Period of Adoption, Adjusted Balance
Change in accumulated other comprehensive income (loss)
Balance, beginning of period				(5,755)
CTA, net of hedges
Change in accumulated other comprehensive income (loss)
Balance, beginning of period		(32,773)	(32,810)	(33,637)	(31,166)
Other comprehensive income before reclassifications		(1,496)	(2,423)	(632)	(4,412)
Increase (decrease) due to amounts reclassified from AOCI		0	24	0	369
Total other comprehensive income		(1,496)	(2,399)	(632)	(4,043)
Balance, end of period		(34,269)	(35,209)	(34,269)	(35,209)
CTA, net of hedges | Cumulative Effect, Period of Adoption, Adjustment
Change in accumulated other comprehensive income (loss)
Balance, beginning of period				0
CTA, net of hedges | Cumulative Effect, Period of Adoption, Adjusted Balance
Change in accumulated other comprehensive income (loss)
Balance, beginning of period				(33,637)
Excluded component of fair value hedges
Change in accumulated other comprehensive income (loss)
Balance, beginning of period		5	10	8	(47)
Other comprehensive income before reclassifications		(3)	31	8	81
Increase (decrease) due to amounts reclassified from AOCI		(9)	(1)	(23)	6
Total other comprehensive income		(12)	30	(15)	87
Balance, end of period		(7)	40	(7)	40
Excluded component of fair value hedges | Cumulative Effect, Period of Adoption, Adjustment
Change in accumulated other comprehensive income (loss)
Balance, beginning of period				0
Excluded component of fair value hedges | Cumulative Effect, Period of Adoption, Adjusted Balance
Change in accumulated other comprehensive income (loss)
Balance, beginning of period				8
Long-duration insurance contracts
Change in accumulated other comprehensive income (loss)
Balance, beginning of period		26	0	0	0
Other comprehensive income before reclassifications		23	0	22	0
Increase (decrease) due to amounts reclassified from AOCI		0	0	0	0
Total other comprehensive income		23	0	22	0
Balance, end of period		49	0	49	0
Long-duration insurance contracts | Cumulative Effect, Period of Adoption, Adjustment
Change in accumulated other comprehensive income (loss)
Balance, beginning of period				27
Long-duration insurance contracts | Cumulative Effect, Period of Adoption, Adjusted Balance
Change in accumulated other comprehensive income (loss)
Balance, beginning of period				27
Accumulated other comprehensive income (loss)
Change in accumulated other comprehensive income (loss)
Balance, beginning of period		(45,865)	(45,495)	(47,062)	(38,765)
Other comprehensive income before reclassifications		(722)	(2,978)	(302)	(9,869)
Increase (decrease) due to amounts reclassified from AOCI		410	175	1,160	336
Total other comprehensive income		(312)	(2,803)	858	(9,533)
Balance, end of period		(46,177)	(48,298)	(46,177)	(48,298)
Accumulated other comprehensive income (loss) | Cumulative Effect, Period of Adoption, Adjustment
Change in accumulated other comprehensive income (loss)
Balance, beginning of period	[1]	0	0	27	0
Accumulated other comprehensive income (loss) | Cumulative Effect, Period of Adoption, Adjusted Balance
Change in accumulated other comprehensive income (loss)
Balance, beginning of period		$ (45,865)	$ (45,495)	$ (47,035)	$ (38,765)

[1] See Note 1 for additional details.