FAIR VALUE OF ASSETS AND LIABILITIES - Changes in Level 3 Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		9 Months Ended
	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021
Insurance Liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	$ (11,257)				$ (13,611)
Total realized and unrealized gains (losses)	4,953			$ 7,307
Reduction in estimates of ultimate losses	(4,615)				(6,269)
Increase in estimates of ultimate losses	393				1,599
Change in fair value (discount rate)	(808)				(2,328)
Paid losses	111				209
Other	(34)				(518)
Fair Value, end of period	(6,304)			(6,304)	(6,304)
Other invested assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	0				0
Total realized and unrealized gains (losses)	0				0
Purchases	71				71
Sales	0				0
Issuances	0				0
Settlements	0				0
Other	0				0
Transfers into Level 3	0				0
Transfers out of Level 3	0				0
Fair Value, end of period	71			71	71
Unrealized gains (losses) for assets still held
Secured receivable
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	1,555				1,622
Total realized and unrealized gains (losses)	(9)				(59)
Purchases	22				22
Sales	(60)				(75)
Issuances	0				0
Settlements	0				0
Other	(1,508)				(1,510)
Transfers into Level 3	0				0
Transfers out of Level 3	0				0
Fair Value, end of period	0			0	0
Unrealized gains (losses) for assets still held	0				0
Short term investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	215	$ 13	$ 23	0	5	$ 10
Total realized and unrealized gains (losses)	(145)	0	0		65	0
Purchases	0	0	6		0	30
Sales	0	0	0		0	0
Issuances	0	0	0		0	0
Settlements	0	(13)	(17)		0	(29)
Other	0	0	0		0	0
Transfers into Level 3	0	0	0		0	1
Transfers out of Level 3	0	0	0		0	0
Fair Value, end of period	70	0	12	70	70	12
Unrealized gains (losses) for assets still held	0	0	0		0	0
Short term investments | Realized investment gains (losses), net
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)			0			0
Unrealized gains (losses) for assets still held			0			0
Short term investments | Other income (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)			0			0
Unrealized gains (losses) for assets still held			0			0
Short term investments | Included in other comprehensive income (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)			0			0
Unrealized gains (losses) for assets still held			0			0
Short term investments | Net investment income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)			0			0
Cash equivalents
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		8	0	0		0
Total realized and unrealized gains (losses)		0	0			0
Purchases		0	0			0
Sales		0	0			0
Issuances		0	0			0
Settlements		(8)	0			0
Other		0	0			0
Transfers into Level 3		0	0			0
Transfers out of Level 3		0	0			0
Fair Value, end of period		0	0			0
Unrealized gains (losses) for assets still held		0	0			0
Cash equivalents | Realized investment gains (losses), net
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)			0			0
Unrealized gains (losses) for assets still held			0			0
Cash equivalents | Other income (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)			0			0
Unrealized gains (losses) for assets still held			0			0
Cash equivalents | Included in other comprehensive income (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)			0			0
Unrealized gains (losses) for assets still held			0			0
Cash equivalents | Net investment income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)			0			0
Other assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		400	68	376		54
Total realized and unrealized gains (losses)		(21)	1			14
Purchases		13	1			7
Sales		0	0			0
Issuances		0	0			0
Settlements		(16)	(1)			(6)
Other		0	0			0
Transfers into Level 3		0	0			0
Transfers out of Level 3		0	0			0
Fair Value, end of period		376	69			69
Unrealized gains (losses) for assets still held		(6)	0			8
Other assets | Realized investment gains (losses), net
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)		(21)	1			14
Unrealized gains (losses) for assets still held		(6)	0			8
Other assets | Other income (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)		0	0			0
Unrealized gains (losses) for assets still held		0	0			0
Other assets | Included in other comprehensive income (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)		0	0			0
Unrealized gains (losses) for assets still held		0	0			0
Other assets | Net investment income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)		0	0			0
Asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	2,158				2,615
Total realized and unrealized gains (losses)	(3)				(144)
Purchases	0				0
Sales	0				0
Issuances	0				0
Settlements	0				0
Other	(1,296)				(1,612)
Transfers into Level 3	0				0
Transfers out of Level 3	0				0
Fair Value, end of period	859			859	859
Unrealized gains (losses) for assets still held	0				0
Reinsurance recoverables
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	378	1,881	302	1,866	344	409
Total realized and unrealized gains (losses)	(158)	201	(4)		(124)	(120)
Purchases	0	4	4		0	13
Sales	0	0	0		0	0
Issuances	0	0	0		0	0
Settlements	0	19	0		0	0
Other	0	(239)	0		0	0
Transfers into Level 3	0	0	0		0	0
Transfers out of Level 3	0	0	0		0	0
Fair Value, end of period	220	1,866	302	220	220	302
Unrealized gains (losses) for assets still held	0	222	(1)		0	(106)
Reinsurance recoverables | Realized investment gains (losses), net
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)		201	(4)			(120)
Unrealized gains (losses) for assets still held		222	(1)			(106)
Reinsurance recoverables | Other income (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)		0	0			0
Unrealized gains (losses) for assets still held		0	0			0
Reinsurance recoverables | Included in other comprehensive income (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)		0	0			0
Unrealized gains (losses) for assets still held		0	0			0
Reinsurance recoverables | Net investment income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)		0	0			0
Future policy benefits
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		(4,060)	(12,530)	(3,393)		(17,314)
Total realized and unrealized gains (losses)		715	8,380			13,746
Purchases		0	0			0
Sales		0	0			0
Issuances		(48)	(49)			(631)
Settlements		0	0			0
Other		0	0			0
Transfers into Level 3		0	0			0
Transfers out of Level 3		0	0			0
Fair Value, end of period		(3,393)	(4,199)			(4,199)
Unrealized gains (losses) for liabilities still held		686	14			1,281
Future policy benefits | Realized investment gains (losses), net
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)		715	8,380			13,746
Unrealized gains (losses) for liabilities still held		686	14			1,281
Future policy benefits | Other income (loss)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)		0	0			0
Unrealized gains (losses) for liabilities still held		0	0			0
Future policy benefits | Included in other comprehensive income (loss)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)		0	0			0
Unrealized gains (losses) for liabilities still held		0	0			0
Future policy benefits | Net investment income
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)		0	0			0
Policyholders' account balances
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		(2,041)	(1,361)	(1,934)		(580)
Total realized and unrealized gains (losses)		124	(8)			(516)
Purchases		0	0			0
Sales		0	0			0
Issuances		0	(88)			(361)
Settlements		(17)	0			0
Other		0	0			0
Transfers into Level 3		0	0			0
Transfers out of Level 3		0	0			0
Fair Value, end of period		(1,934)	(1,457)			(1,457)
Unrealized gains (losses) for liabilities still held		89	543			79
Policyholders' account balances | Realized investment gains (losses), net
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)		124	(8)			(516)
Unrealized gains (losses) for liabilities still held		89	543			79
Policyholders' account balances | Other income (loss)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)		0	0			0
Unrealized gains (losses) for liabilities still held		0	0			0
Policyholders' account balances | Included in other comprehensive income (loss)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)		0	0			0
Unrealized gains (losses) for liabilities still held		0	0			0
Policyholders' account balances | Net investment income
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)		0	0			0
Fixed maturity securities | Fixed maturities, trading
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period			5			5
Total realized and unrealized gains (losses)			0			0
Purchases			2			2
Sales			0			0
Issuances			0			0
Settlements			0			0
Other			0			0
Transfers into Level 3			0			0
Transfers out of Level 3			(5)			(5)
Fair Value, end of period			2			2
Unrealized gains (losses) for assets still held			0			0
Fixed maturity securities | Realized investment gains (losses), net | Fixed Maturity, Available-For Sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)		0	0			(3)
Unrealized gains (losses) for assets still held		0	(2)			(5)
Fixed maturity securities | Realized investment gains (losses), net | Fixed maturities, trading
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)			0			0
Unrealized gains (losses) for assets still held			0			0
Fixed maturity securities | Other income (loss) | Fixed Maturity, Available-For Sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)		0	0			0
Unrealized gains (losses) for assets still held		0	0			0
Fixed maturity securities | Other income (loss) | Fixed maturities, trading
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)			0			0
Unrealized gains (losses) for assets still held			0			0
Fixed maturity securities | Included in other comprehensive income (loss) | Fixed Maturity, Available-For Sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)		(12)	(6)			(3)
Unrealized gains (losses) for assets still held		(12)	(3)			(2)
Fixed maturity securities | Included in other comprehensive income (loss) | Fixed maturities, trading
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)			0			0
Unrealized gains (losses) for assets still held			0			0
Fixed maturity securities | Net investment income | Fixed Maturity, Available-For Sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)		0	0			0
Fixed maturity securities | Net investment income | Fixed maturities, trading
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)			0			0
Fixed maturity securities | U.S Treasury securities and obligations of U.S. government authorities and agencies
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		0	15	0		15
Total realized and unrealized gains (losses)		0	0			0
Purchases		0	0			0
Sales		0	0			0
Issuances		0	0			0
Settlements		0	0			0
Other		0	0			0
Transfers into Level 3		0	0			0
Transfers out of Level 3		0	0			0
Fair Value, end of period		0	15			15
Unrealized gains (losses) for assets still held		0	0			0
Fixed maturity securities | Corporate Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	314	190	232	180	190	149
Total realized and unrealized gains (losses)	(22)	(9)	(6)		(38)	(5)
Purchases	232	5	143		439	249
Sales	0	(4)	(11)		0	(11)
Issuances	0	0	0		0	0
Settlements	(44)	(2)	(14)		(55)	(45)
Other	(114)	0	(122)		(117)	(122)
Transfers into Level 3	0	0	2		0	17
Transfers out of Level 3	0	0	0		(53)	(8)
Fair Value, end of period	366	180	224	366	366	224
Unrealized gains (losses) for assets still held	0	(9)	(5)		0	(6)
Fixed maturity securities | Structured securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	25	76	216	47	33	19
Total realized and unrealized gains (losses)	(2)	(4)	0		(2)	(1)
Purchases	150	0	32		175	235
Sales	0	(10)	0		(10)	0
Issuances	0	0	0		0	0
Settlements	(18)	(2)	(1)		(18)	(6)
Other	0	0	(20)		(10)	(20)
Transfers into Level 3	0	0	0		0	0
Transfers out of Level 3	0	(13)	(172)		(13)	(172)
Fair Value, end of period	155	47	55	155	155	55
Unrealized gains (losses) for assets still held	$ 0	(4)	0		$ 0	(1)
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period			5			4
Total realized and unrealized gains (losses)			0			1
Purchases			0			0
Sales			0			0
Issuances			0			0
Settlements			0			0
Other			(4)			(4)
Transfers into Level 3			0			0
Transfers out of Level 3			0			0
Fair Value, end of period			1			1
Unrealized gains (losses) for assets still held			0			1
Equity securities | Realized investment gains (losses), net
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)			0			0
Unrealized gains (losses) for assets still held			0			0
Equity securities | Other income (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)			0			1
Unrealized gains (losses) for assets still held			0			1
Equity securities | Included in other comprehensive income (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)			0			0
Unrealized gains (losses) for assets still held			0			0
Equity securities | Net investment income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses)			$ 0			$ 0
Equity securities | Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period		1		$ 1
Total realized and unrealized gains (losses)		0
Purchases		0
Sales		0
Issuances		0
Settlements		0
Other		0
Transfers into Level 3		0
Transfers out of Level 3		0
Fair Value, end of period		1
Unrealized gains (losses) for assets still held		$ 0