CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (AOCI) - Change in Each Component of AOCI (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Change in accumulated other comprehensive income (loss)
Balance, beginning of period		$ 206,251
Balance, end of period		207,398	$ 209,019
Liability for future policyholder benefits		546	525
Net unrealized gains (losses) on debt securities
Change in accumulated other comprehensive income (loss)
Balance, beginning of period		(3,744)	(5,998)
Other comprehensive income before reclassifications		176	855
Increase (decrease) due to amounts reclassified from AOCI		(76)	(19)
Total other comprehensive income		100	836
Balance, end of period		(3,644)	(5,162)
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		(709)	842
Other comprehensive income before reclassifications		(573)	(327)
Increase (decrease) due to amounts reclassified from AOCI		10	2
Total other comprehensive income		(563)	(325)
Balance, end of period		(1,272)	517
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		(1,406)	(2,522)
Other comprehensive income before reclassifications		232	6
Increase (decrease) due to amounts reclassified from AOCI		260	355
Total other comprehensive income		492	361
Balance, end of period		(914)	(2,161)
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		(6,050)	(5,755)
Other comprehensive income before reclassifications		30	(132)
Increase (decrease) due to amounts reclassified from AOCI		47	28
Total other comprehensive income		77	(104)
Balance, end of period		(5,973)	(5,859)
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		(32,885)	(33,637)
Other comprehensive income before reclassifications		(1,054)	841
Increase (decrease) due to amounts reclassified from AOCI		0	0
Total other comprehensive income		(1,054)	841
Balance, end of period		(33,939)	(32,796)
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		(40)	8
Other comprehensive income before reclassifications		8	(16)
Increase (decrease) due to amounts reclassified from AOCI		(10)	(4)
Total other comprehensive income		(2)	(20)
Balance, end of period		(42)	(12)
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		34	0
Other comprehensive income before reclassifications		21	5
Increase (decrease) due to amounts reclassified from AOCI		0	0
Total other comprehensive income		21	5
Balance, end of period		55	32
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		(44,800)	(47,062)
Other comprehensive income before reclassifications		(1,160)	1,232
Increase (decrease) due to amounts reclassified from AOCI		231	362
Total other comprehensive income		(929)	1,594
Balance, end of period		(45,729)	(45,441)
Accumulated other comprehensive income (loss) | Cumulative Effect, Period of Adoption, Adjustment
Change in accumulated other comprehensive income (loss)
Balance, beginning of period	[1]	0	27
Accumulated other comprehensive income (loss) | Cumulative Effect, Period of Adoption, Adjusted Balance
Change in accumulated other comprehensive income (loss)
Balance, beginning of period		$ (44,800)	$ (47,035)

[1] See Note 1 for additional details.