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FAIR VALUE - Level 3 Activity (Details) - USD ($)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Total gains or (losses) (realized/unrealized)
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	$ 0
Market Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance of fixed maturities	2,189,000,000	$ 1,993,000,000
Total gains or (losses) (realized/unrealized)
Included in earnings	0	1,000,000
Included in other comprehensive income (loss)	$ (5,000,000)	$ 7,000,000
Included in other comprehensive income (loss)	Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Purchases, issuances and settlements	$ 49,000,000	$ (25,000,000)
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	0	0
Ending balance of fixed maturities	2,234,000,000	1,976,000,000
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	1,000,000
Corporate Securities | Market Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance of fixed maturities	518,000,000	672,000,000
Total gains or (losses) (realized/unrealized)
Included in earnings	0	1,000,000
Included in other comprehensive income (loss)	(6,000,000)	0
Purchases, issuances and settlements	(45,000,000)	(52,000,000)
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	0	0
Ending balance of fixed maturities	468,000,000	620,000,000
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	1,000,000
Asset-backed Securities | Market Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance of fixed maturities	1,657,000,000	1,305,000,000
Total gains or (losses) (realized/unrealized)
Included in earnings	0	0
Included in other comprehensive income (loss)	1,000,000	7,000,000
Purchases, issuances and settlements	94,000,000	28,000,000
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	0	0
Ending balance of fixed maturities	1,752,000,000	1,340,000,000
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
Foreign corporate securities | Market Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance of fixed maturities	14,000,000	16,000,000
Total gains or (losses) (realized/unrealized)
Included in earnings	0	0
Included in other comprehensive income (loss)	0	0
Purchases, issuances and settlements	0	(1,000,000)
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	0	0
Ending balance of fixed maturities	14,000,000	16,000,000
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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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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