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Fair Value Measurements (excluding Consolidated Investment Entities) - Level 3 Financial Instruments (Details) - Level 3 - Measured at fair value on a recurring basis - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Managed custody guarantees
Derivatives Rollforward:
Fair Value, Derivatives, beginning balance	$ (13)	$ (10)
Gains (losses) from standalone derivatives recognized in Net gains (losses)	5	0
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0
Purchases	0	0
Issuances	0	0
Sales	0	0
Settlements	2	0
Transfers in to Level 3	0	0
Transfers out of Level 3	0	0
Change In Unrealized Gains (Losses) Included in Earnings	0	0
Change In Unrealized Gains (Losses) Included in OCI	0	0
Embedded derivatives within reinsurance
Derivatives Rollforward:
Fair Value, Derivatives, beginning balance	(42)	(57)	$ (53)	$ (58)
Gains (losses) from standalone derivatives recognized in Net gains (losses)	0	(1)	11	0
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	6	0	6
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair Value, Derivatives, ending balance	(42)	(52)	(42)	(52)
Change In Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Change In Unrealized Gains (Losses) Included in OCI	0	0	0	0
Short-term investments and cash equivalents
Derivatives Rollforward:
Fair Value, Derivatives, beginning balance	25		23
Gains (losses) from standalone derivatives recognized in Net gains (losses)	1		1
Total Realized/Unrealized Gains (Losses) Included in OCI	(1)		1
Purchases	0		0
Issuances	0		0
Sales	0		0
Settlements	(15)		(15)
Transfers in to Level 3	0		0
Transfers out of Level 3	0		0
Fair Value, Derivatives, ending balance	10		10
Change In Unrealized Gains (Losses) Included in Earnings	0		0
Change In Unrealized Gains (Losses) Included in OCI	(2)		0
Fixed maturities
Assets Rollforward:
Fair Value, Assets, beginning balance	2,613	2,010	2,127	2,090
Total Realized/Unrealized Gains (Losses) Included in Net income	1	2	(51)	(3)
Total Realized/Unrealized Gains (Losses) Included in OCI	22	60	106	27
Purchases	419	175	1,010	318
Issuances	0	0	0	0
Sales	(46)	(21)	(66)	(18)
Settlements	(170)	(85)	(308)	(254)
Transfers in to Level 3	0	0	0	51
Transfers out of Level 3	(35)	(107)	(14)	(177)
Fair Value, Assets, ending balance	2,804	2,034	2,804	2,034
Change In Unrealized Gains (Losses) Included in Earnings	(1)	8	(22)	3
Derivatives Rollforward:
Change In Unrealized Gains (Losses) Included in OCI	24	56	102	19
US Government Agencies Debt Securities
Assets Rollforward:
Fair Value, Assets, beginning balance				1
Total Realized/Unrealized Gains (Losses) Included in Net income				0
Total Realized/Unrealized Gains (Losses) Included in OCI				0
Purchases				0
Issuances				0
Sales				0
Settlements				0
Transfers in to Level 3				0
Transfers out of Level 3				(1)
Fair Value, Assets, ending balance		0		0
Change In Unrealized Gains (Losses) Included in Earnings				0
Derivatives Rollforward:
Change In Unrealized Gains (Losses) Included in OCI				0
U.S. corporate public securities
Assets Rollforward:
Fair Value, Assets, beginning balance	48	12	59	18
Total Realized/Unrealized Gains (Losses) Included in Net income	0	0	(1)	0
Total Realized/Unrealized Gains (Losses) Included in OCI	1	(1)	2	0
Purchases	15	0	15	0
Issuances	0	0	0	0
Sales	0	0	(10)	0
Settlements	0	0	0	(7)
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	(1)	0	(2)	0
Fair Value, Assets, ending balance	63	11	63	11
Change In Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Derivatives Rollforward:
Change In Unrealized Gains (Losses) Included in OCI	0	(1)	1	(1)
U.S. corporate private securities
Assets Rollforward:
Fair Value, Assets, beginning balance	1,675	1,464	1,497	1,526
Total Realized/Unrealized Gains (Losses) Included in Net income	0	(4)	2	(5)
Total Realized/Unrealized Gains (Losses) Included in OCI	18	58	52	36
Purchases	235	118	504	240
Issuances	0	0	0	0
Sales	(33)	(3)	(42)	(9)
Settlements	(94)	(81)	(212)	(196)
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	(107)	0	(147)
Fair Value, Assets, ending balance	1,801	1,445	1,801	1,445
Change In Unrealized Gains (Losses) Included in Earnings	1	2	1	1
Derivatives Rollforward:
Change In Unrealized Gains (Losses) Included in OCI	18	54	50	29
Foreign corporate public securities and foreign governments
Assets Rollforward:
Fair Value, Assets, beginning balance	62	17	60	0
Total Realized/Unrealized Gains (Losses) Included in Net income	0	0	0	0
Total Realized/Unrealized Gains (Losses) Included in OCI	2	1	1	0
Purchases	0	10	0	10
Issuances	0	0	0	0
Sales	0	(18)	0	0
Settlements	0	0	0	0
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	(3)	0	0	0
Fair Value, Assets, ending balance	61	10	61	10
Change In Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Derivatives Rollforward:
Change In Unrealized Gains (Losses) Included in OCI	2	0	1	0
Foreign corporate private securities
Assets Rollforward:
Fair Value, Assets, beginning balance	636	444	421	436
Total Realized/Unrealized Gains (Losses) Included in Net income	3	2	(47)	2
Total Realized/Unrealized Gains (Losses) Included in OCI	1	2	50	(9)
Purchases	34	22	266	43
Issuances	0	0	0	0
Sales	0	0	0	(9)
Settlements	(73)	(2)	(89)	(46)
Transfers in to Level 3	0	0	0	51
Transfers out of Level 3	0	0	0	0
Fair Value, Assets, ending balance	601	468	601	468
Change In Unrealized Gains (Losses) Included in Earnings	0	1	(18)	1
Derivatives Rollforward:
Change In Unrealized Gains (Losses) Included in OCI	4	3	49	(9)
Residential mortgage-backed securities
Assets Rollforward:
Fair Value, Assets, beginning balance	98	49	67	57
Total Realized/Unrealized Gains (Losses) Included in Net income	(2)	4	(5)	0
Total Realized/Unrealized Gains (Losses) Included in OCI	(1)	0	0	0
Purchases	0	13	17	13
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	(26)	0	(10)	(4)
Fair Value, Assets, ending balance	69	66	69	66
Change In Unrealized Gains (Losses) Included in Earnings	(2)	5	(5)	1
Derivatives Rollforward:
Change In Unrealized Gains (Losses) Included in OCI	(1)	0	0	0
Other asset-backed securities
Assets Rollforward:
Fair Value, Assets, beginning balance	94	24	23	52
Total Realized/Unrealized Gains (Losses) Included in Net income	0	0	0	0
Total Realized/Unrealized Gains (Losses) Included in OCI	1	0	1	0
Purchases	135	12	208	12
Issuances	0	0	0	0
Sales	(13)	0	(14)	0
Settlements	(3)	(2)	(7)	(5)
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	(5)	0	(2)	(25)
Fair Value, Assets, ending balance	209	34	209	34
Change In Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Derivatives Rollforward:
Change In Unrealized Gains (Losses) Included in OCI	1	0	1	0
Equity securities, at fair value
Assets Rollforward:
Fair Value, Assets, beginning balance	95	98	98	96
Total Realized/Unrealized Gains (Losses) Included in Net income	(1)	4	1	6
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	0	0	9	0
Issuances	0	0	0	0
Sales	0	0	(14)	0
Settlements	0	0	0	0
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair Value, Assets, ending balance	94	102	94	102
Change In Unrealized Gains (Losses) Included in Earnings	(1)	4	2	6
Derivatives Rollforward:
Change In Unrealized Gains (Losses) Included in OCI	0	0	0	0
Contingent Consideration
Liabilities Rollforward:
Fair Value, Liabilities, Ending Balance	(154)	(49)	(2)	(51)
Total Realized/Unrealized Gains (Losses) Included in Net income	0	0	(4)	0
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	0	0	0	0
Issuances	0	0	(149)	0
Sales	0	0	0	0
Settlements	0	14	1	16
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair Value, Liabilities, Ending Balance	(154)	(35)	(154)	(35)
Change In Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Derivatives Rollforward:
Change In Unrealized Gains (Losses) Included in OCI	0	0	0	0
Managed custody guarantees
Liabilities Rollforward:
Fair Value, Liabilities, Ending Balance			(19)	(9)
Total Realized/Unrealized Gains (Losses) Included in Net income			12	0
Total Realized/Unrealized Gains (Losses) Included in OCI			0	0
Purchases			0	0
Issuances			(1)	(1)
Sales			0	0
Settlements			2	0
Transfers into Level 3			0	0
Transfers out of Level 3			0	0
Fair Value, Liabilities, Ending Balance	(6)	(10)	(6)	(10)
Change In Unrealized Gains (Losses) Included in Earnings			0	0
Derivatives Rollforward:
Change In Unrealized Gains (Losses) Included in OCI			0	0
Assets held in separate accounts
Assets Rollforward:
Fair Value, Assets, beginning balance	347	363	340	348
Total Realized/Unrealized Gains (Losses) Included in Net income	2	11	8	12
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	36	12	57	47
Issuances	0	0	0	0
Sales	(10)	(9)	(27)	(24)
Settlements	0	0	0	0
Transfers in to Level 3	0	0	0	5
Transfers out of Level 3	(3)	(29)	(6)	(40)
Fair Value, Assets, ending balance	372	348	372	348
Change In Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Derivatives Rollforward:
Change In Unrealized Gains (Losses) Included in OCI	$ 0	$ 0	$ 0	$ 0

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

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Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy.

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Amount of issuances 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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