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FAIR VALUE - Schedule of Activity under Level 3, Fair Value Measurements using Significant Unobservable Inputs by Asset Type (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Total gains or (losses) (realized/unrealized)
Transfer in and/or (out) of Level 3	$ 0	$ 779,000,000
Market Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance fixed maturities	1,725,000,000	2,068,000,000
Total gains or (losses) (realized/unrealized)
Included in earnings (or changes in net assets)	4,000,000	$ (10,000,000)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]		Net increase (decrease) during the period
Included in other comprehensive income (loss)	4,000,000	$ (36,000,000)
Purchases, issuances and settlements	260,000,000	481,000,000
Transfer in and/or (out) of Level 3	0	(779,000,000)
Ending balance	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	9,000,000	(15,000,000)
Corporate Securities | Market Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance fixed maturities	715,000,000	801,000,000
Total gains or (losses) (realized/unrealized)
Included in earnings (or changes in net assets)	4,000,000	(10,000,000)
Included in other comprehensive income (loss)	(2,000,000)	3,000,000
Purchases, issuances and settlements	(45,000,000)	(45,000,000)
Transfer in and/or (out) of Level 3	0	(35,000,000)
Ending balance	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	9,000,000	(23,000,000)
Asset-Backed Securities | Market Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance fixed maturities	994,000,000	1,251,000,000
Total gains or (losses) (realized/unrealized)
Included in earnings (or changes in net assets)	0	0
Included in other comprehensive income (loss)	6,000,000	(35,000,000)
Purchases, issuances and settlements	305,000,000	513,000,000
Transfer in and/or (out) of Level 3	0	(735,000,000)
Ending balance	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	8,000,000
CMBS | Market Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance fixed maturities	0	0
Total gains or (losses) (realized/unrealized)
Included in earnings (or changes in net assets)	0	0
Included in other comprehensive income (loss)	0	0
Purchases, issuances and settlements	0	6,000,000
Transfer in and/or (out) of Level 3	0	(6,000,000)
Ending balance	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
Foreign Corporate | Market Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance fixed maturities	16,000,000	16,000,000
Total gains or (losses) (realized/unrealized)
Included in earnings (or changes in net assets)	0	0
Included in other comprehensive income (loss)	0	(4,000,000)
Purchases, issuances and settlements	0	8,000,000
Transfer in and/or (out) of Level 3	0	(4,000,000)
Ending balance	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

X

- Definition

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

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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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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- Definition

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

+ References

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-Topic 820
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-Paragraph 2
-Subparagraph (c)(1)
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- Definition

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

+ References

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- Definition

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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Fair value 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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- Definition

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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