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FAIR VALUE - Level 3 Activity (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
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	1,993,000,000	$ 1,725,000,000	$ 1,725,000,000
Total gains or (losses) (realized/unrealized)
Included in earnings	1,000,000	1,000,000
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]			Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Included in other comprehensive income (loss)	7,000,000	14,000,000
Purchases, issuances and settlements	(25,000,000)	5,000,000
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	0	0
Ending balance of fixed maturities	1,976,000,000	1,745,000,000	$ 1,993,000,000	$ 1,725,000,000
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	1,000,000	0
Corporate Securities | Market Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance of fixed maturities	672,000,000	715,000,000	715,000,000
Total gains or (losses) (realized/unrealized)
Included in earnings	1,000,000	1,000,000
Included in other comprehensive income (loss)	0	(4,000,000)
Purchases, issuances and settlements	(52,000,000)	(3,000,000)
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	0	0
Ending balance of fixed maturities	620,000,000	709,000,000	672,000,000	715,000,000
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	1,000,000	0
Asset-backed Securities | Market Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance of fixed maturities	1,305,000,000	994,000,000	994,000,000
Total gains or (losses) (realized/unrealized)
Included in earnings	0	0
Included in other comprehensive income (loss)	7,000,000	18,000,000
Purchases, issuances and settlements	28,000,000	9,000,000
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	0	0
Ending balance of fixed maturities	1,340,000,000	1,020,000,000	1,305,000,000	994,000,000
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	16,000,000	16,000,000	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	(1,000,000)	0
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	0	0
Ending balance of fixed maturities	16,000,000	16,000,000	$ 16,000,000	$ 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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- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings And Other Comprehensive Income

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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Indicates line item in statement in which other comprehensive income (OCI) is reported that includes gain (loss) from asset measured at fair value using unobservable input (level 3).

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