FAIR VALUE DISCLOSURES - Fair Value Measurement Reconciliation For All Levels (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Total gains and (losses), realized and unrealized, included in:
Transfers into Level 3	$ 57	$ 0
Transfers out of Level 3	(88)	(258)
Level 3 \| Corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2,070	2,103
Total gains and (losses), realized and unrealized, included in:
Investment gains (losses), reported in net investment income	2	1
Investment gains (losses), net	(1)	(3)
Subtotal	1	(2)
Other comprehensive income (loss)	10	18
Purchases	201	143
Sales	(54)	(90)
Activity related to consolidated VIEs/VOEs	0	0
Transfers into Level 3	57	0
Transfers out of Level 3	(47)	(258)
Closing Balance	2,238	1,914
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period	0	0
Change in unrealized gains or losses for the period included in other comprehensive income for instruments held at the end of the reporting period	10	17
Level 3 \| State and Political Subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	27	29
Total gains and (losses), realized and unrealized, included in:
Investment gains (losses), reported in net investment income	0	0
Investment gains (losses), net	0	0
Subtotal	0	0
Other comprehensive income (loss)	0	0
Purchases	0	0
Sales	0	(1)
Activity related to consolidated VIEs/VOEs	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	(27)	0
Closing Balance	0	28
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period	0	0
Change in unrealized gains or losses for the period included in other comprehensive income for instruments held at the end of the reporting period	0	0
Level 3 \| Asset-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	24	0
Total gains and (losses), realized and unrealized, included in:
Investment gains (losses), reported in net investment income	0	0
Investment gains (losses), net	0	0
Subtotal	0	0
Other comprehensive income (loss)	0	0
Purchases	23	12
Sales	0	0
Activity related to consolidated VIEs/VOEs	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	(14)	0
Closing Balance	33	12
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period	0	0
Change in unrealized gains or losses for the period included in other comprehensive income for instruments held at the end of the reporting period	0	0
Level 3 \| CMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	6	32
Total gains and (losses), realized and unrealized, included in:
Investment gains (losses), reported in net investment income	0	0
Investment gains (losses), net	0	0
Subtotal	0	0
Other comprehensive income (loss)	0	0
Purchases	0	2
Sales	0	0
Activity related to consolidated VIEs/VOEs	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Closing Balance	6	34
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period	0	0
Change in unrealized gains or losses for the period included in other comprehensive income for instruments held at the end of the reporting period	0	0
Level 3 \| Other equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	57	17
Total gains and (losses), realized and unrealized, included in:
Investment gains (losses), reported in net investment income	1	(3)
Investment gains (losses), net	0	0
Subtotal	1	(3)
Other comprehensive income (loss)	0	0
Purchases	42	0
Sales	(42)	0
Change in fair value of funds withheld assets	0
Other	0	0
Activity related to consolidated VIEs/VOEs	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Closing Balance	58	14
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period	0	(3)
Change in unrealized gains or losses for the period included in other comprehensive income for instruments held at the end of the reporting period	0	0
Level 3 \| Separate Accounts Assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	0	1
Total gains and (losses), realized and unrealized, included in:
Investment gains (losses), reported in net investment income	0	0
Investment gains (losses), net	0	0
Subtotal	0	0
Other comprehensive income (loss)	0	0
Purchases	1	0
Sales	0	0
Change in fair value of funds withheld assets	0
Other	0	0
Activity related to consolidated VIEs/VOEs	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Closing Balance	1	1
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period	0	0
Change in unrealized gains or losses for the period included in other comprehensive income for instruments held at the end of the reporting period	0	0
Level 3 \| Funds Withheld Payable
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	100	0
Total gains and (losses), realized and unrealized, included in:
Investment gains (losses), reported in net investment income	0	0
Investment gains (losses), net	0	0
Subtotal	0	0
Other comprehensive income (loss)	0	0
Purchases	0	0
Sales	0	0
Change in fair value of funds withheld assets	(129)
Other	0	0
Activity related to consolidated VIEs/VOEs	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Closing Balance	(29)	0
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period	0	0
Change in unrealized gains or losses for the period included in other comprehensive income for instruments held at the end of the reporting period	0	0
Level 3 \| Modco Payable
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	(411)	0
Total gains and (losses), realized and unrealized, included in:
Investment gains (losses), reported in net investment income	0	0
Investment gains (losses), net	0	0
Subtotal	0	0
Other comprehensive income (loss)	0	0
Purchases	0	0
Sales	0	0
Change in fair value of funds withheld assets	119
Other	0	0
Activity related to consolidated VIEs/VOEs	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Closing Balance	(292)	0
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period	0	0
Change in unrealized gains or losses for the period included in other comprehensive income for instruments held at the end of the reporting period	$ 0	$ 0

Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Change In Fair Value

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

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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 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 level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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