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FAIR VALUE - Level 3 Activity (Details) - Market Value - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance of fixed maturities	$ 1,842	$ 2,164	$ 1,725	$ 2,068
Total gains or (losses) (realized/unrealized)
Included in earnings	1	(2)	3	9
Included in other comprehensive income (loss)	(3)	59	2	(28)
Purchases, issuances and settlements	80	186	191	358
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	0	(779)	0	(779)
Ending balance of fixed maturities	1,921	1,628	1,921	1,628
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date	0	(3)	1	0
Corporate Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance of fixed maturities	711	863	715	801
Total gains or (losses) (realized/unrealized)
Included in earnings	1	(2)	3	9
Included in other comprehensive income (loss)	0	(6)	(5)	(13)
Purchases, issuances and settlements	12	27	12	(43)
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	0	(163)	0	(35)
Ending balance of fixed maturities	725	719	725	719
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date	0	(3)	1	(8)
Asset-backed Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance of fixed maturities	1,115	1,255	994	1,251
Total gains or (losses) (realized/unrealized)
Included in earnings	0	0	0	0
Included in other comprehensive income (loss)	(3)	65	7	(11)
Purchases, issuances and settlements	68	159	179	387
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	0	(587)	0	(735)
Ending balance of fixed maturities	1,180	893	1,180	893
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date	0	0	0	8
Foreign corporate securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance of fixed maturities	16	40	16	16
Total gains or (losses) (realized/unrealized)
Included in earnings	0	0	0	0
Included in other comprehensive income (loss)	0	0	0	(4)
Purchases, issuances and settlements	0	0	0	8
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	0	(24)	0	(4)
Ending balance of fixed maturities	16	16	16	16
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date	$ 0	0	$ 0	0
CMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance of fixed maturities		6		0
Total gains or (losses) (realized/unrealized)
Included in earnings		0		0
Included in other comprehensive income (loss)		0		0
Purchases, issuances and settlements		0		6
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories		(6)		(6)
Ending balance of fixed maturities		0		0
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date		$ 0		$ 0

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