FAIR VALUE DISCLOSURES - Fair Value Measurement Reconciliation For All Levels (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Total gains and (losses), realized and unrealized, included in:
Transfers into Level 3			$ 0	$ 90
Transfers out of Level 3			(334)	(114)
Level 3 \| Corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 1,976	$ 1,752	2,103	1,493
Total gains and (losses), realized and unrealized, included in:
Investment gains (losses), reported in net investment income	1	1	4	3
Investment gains (losses), net	(5)	(3)	(16)	(3)
Subtotal	(4)	(2)	(12)	0
Other comprehensive income (loss)	6	(70)	16	(151)
Purchases	129	217	452	765
Sales	(54)	(35)	(216)	(195)
Activity related to consolidated VIEs/VOEs	0	0	0	0
Transfers into Level 3	(11)	25	0	90
Transfers out of Level 3	(33)	7	(334)	(108)
Closing Balance	2,009	1,894	2,009	1,894
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period	0	0	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	6	(70)	10	(148)
Level 3 \| States and political subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	27	30	29	35
Total gains and (losses), realized and unrealized, included in:
Investment gains (losses), reported in net investment income	0		0	0
Investment gains (losses), net	0		0	0
Subtotal	0	0	0	0
Other comprehensive income (loss)	0	(1)	0	(5)
Purchases	0	0	0	0
Sales	(1)	0	(3)	(1)
Activity related to consolidated VIEs/VOEs	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Closing Balance	26	29	26	29
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period	0	0	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	(1)	0	(5)
Level 3 \| CMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	34	25	32	20
Total gains and (losses), realized and unrealized, included in:
Investment gains (losses), reported in net investment income	0	0	0	0
Investment gains (losses), net	0	0	0	0
Subtotal	0	0	0	0
Other comprehensive income (loss)	0	0	0	(2)
Purchases	5	7	7	14
Sales	0	0	0	0
Activity related to consolidated VIEs/VOEs	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Closing Balance	39	32	39	32
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period	0	0	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	0	(2)
Level 3 \| Asset-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	0	18	0	8
Total gains and (losses), realized and unrealized, included in:
Investment gains (losses), reported in net investment income	0	0	0	0
Investment gains (losses), net	0	0	0	0
Subtotal	0	0	0	0
Other comprehensive income (loss)	0	0	0	0
Purchases	10	(2)	10	9
Sales	0	0	0	(1)
Activity related to consolidated VIEs/VOEs	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	(6)	0	(6)
Closing Balance	10	10	10	10
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period	0	0	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	0	0
Level 3 \| Other equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	105	18	17	13
Total gains and (losses), realized and unrealized, included in:
Investment gains (losses), reported in net investment income	0	(1)	(3)	(1)
Investment gains (losses), net	0	0	0	0
Subtotal	0	(1)	(3)	(1)
Other comprehensive income (loss)	0	0	0	0
Purchases	0	0	44	8
Sales	0	0	0	0
Change in fair value of funds withheld assets	0		0
Other	0	0	0	0
Activity related to consolidated VIEs/VOEs	1	0	48	(3)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Closing Balance	106	17	106	17
Change in unrealized gains or losses for the period included in earnings for instruments held at the end of the reporting period	0	(1)	(3)	(1)
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	0	0
Level 3 \| Separate Accounts Assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1	1	1	1
Total gains and (losses), realized and unrealized, included in:
Investment gains (losses), reported in net investment income	0	0	0
Investment gains (losses), net	0	0	0
Subtotal	0	0	0
Other comprehensive income (loss)	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Change in fair value of funds withheld assets	0		0
Other	0	0	0	0
Activity related to consolidated VIEs/VOEs	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Closing Balance	1	1	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	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	0	0
Level 3 \| Funds Withheld Payable
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	(136)	0	0	0
Total gains and (losses), realized and unrealized, included in:
Investment gains (losses), reported in net investment income	0	0	0
Investment gains (losses), net	0	0	0
Subtotal	0	0	0
Other comprehensive income (loss)	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Change in fair value of funds withheld assets	(431)		(567)
Other	0	0	0	0
Activity related to consolidated VIEs/VOEs	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Closing Balance	(567)	0	(567)	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	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	0	0
Level 3 \| Modco payable
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	166	0	0	0
Total gains and (losses), realized and unrealized, included in:
Investment gains (losses), reported in net investment income	0	0	0
Investment gains (losses), net	0	0	0
Subtotal	0	0	0
Other comprehensive income (loss)	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Change in fair value of funds withheld assets	657		823
Other	0	0	0	0
Activity related to consolidated VIEs/VOEs	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Closing Balance	823	0	823	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	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	$ 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 transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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