Fair Value Measurements - Fair Value Recurring Basis, Unobservable Input (Details) - Fair Value, Measurements, Recurring - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Assets
Beginning balance	$ 2,010	$ 1,810	$ 1,805	$ 1,502
Total realized/unrealized gains (losses), Included in net income	4	(2)	12	(44)
Total realized/unrealized gains (losses), Included in OCI	(8)	26	(19)	(8)
Purchases	471	217	1,222	437
Settlements	(120)	(114)	(362)	(282)
Sales	(1)	0	(65)	(34)
Transfers into Level 3	0	34	177	493
Transfers out of Level 3	(182)	(202)	(596)	(295)
Ending balance	2,174	1,769	2,174	1,769
Liabilities
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities	0	0	0	12
Freestanding Derivatives, net
Beginning balance				15
Realized/unrealized gain/loss included in net income, liabilities				36
Realized/unrealized gain/loss included in OCI, liabilities				0
Purchases				0
Sales				0
Transfers into level 3				0
Transfers out of level 3				0
Ending balance		0		0
Other liabilities
Freestanding Derivatives, net
Settlements				(21)
Equity
Freestanding Derivatives, net
Beginning balance				15
Realized/unrealized gain/loss included in net income, liabilities				36
Realized/unrealized gain/loss included in OCI, liabilities				0
Purchases				0
Settlements				(21)
Sales				0
Transfers into level 3				0
Transfers out of level 3				0
Ending balance		0		0
Contingent Consideration
Liabilities
Beginning balance				(22)
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities	0	0	0	12
Total realized/unrealized gains (losses), Included in OCI				0
Purchases				0
Settlements				10
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales				0
Transfers into Level 3				0
Transfers out of Level 3				0
Ending balance		0		0
Liability [Member]
Liabilities
Beginning balance				(37)
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities				48
Total realized/unrealized gains (losses), Included in OCI				0
Purchases				0
Settlements				(11)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales				0
Transfers into Level 3				0
Transfers out of Level 3				0
Ending balance		0		0
Equity securities, at fair value
Assets
Beginning balance	74	66	70	73
Total realized/unrealized gains (losses), Included in net income	4	0	6	(10)
Total realized/unrealized gains (losses), Included in OCI	0	0	0	0
Purchases	2	3	5	6
Settlements	(9)	0	(10)	0
Sales	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Ending balance	71	69	71	69
Short-term investments
Assets
Beginning balance	18	14	30	15
Total realized/unrealized gains (losses), Included in net income	0	0	0	0
Total realized/unrealized gains (losses), Included in OCI	0	0	0	0
Purchases	8	0	10	0
Settlements	(3)	0	(17)	(1)
Sales	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Ending balance	23	14	23	14
Securities available-for-sale and other \| Total Fixed Maturities, AFS
Assets
Beginning balance	1,918	1,730	1,705	1,414
Total realized/unrealized gains (losses), Included in net income	0	(2)	6	(34)
Total realized/unrealized gains (losses), Included in OCI	(8)	26	(19)	(8)
Purchases	386	214	1,132	431
Settlements	(108)	(114)	(335)	(281)
Sales	(1)	0	(65)	(34)
Transfers into Level 3	0	34	177	493
Transfers out of Level 3	(182)	(202)	(596)	(295)
Ending balance	2,005	1,686	2,005	1,686
Securities available-for-sale and other \| ABS \| Total Fixed Maturities, AFS
Assets
Beginning balance	14	23	0	15
Total realized/unrealized gains (losses), Included in net income	0	0	0	0
Total realized/unrealized gains (losses), Included in OCI	0	0	0	(1)
Purchases	23	0	42	43
Settlements	0	0	0	0
Sales	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	(14)	(23)	(19)	(57)
Ending balance	23	0	23	0
Securities available-for-sale and other \| Collateralized Loan Obligations [Member] \| Total Fixed Maturities, AFS
Assets
Beginning balance	375	99	360	95
Total realized/unrealized gains (losses), Included in net income	0	0	0	0
Total realized/unrealized gains (losses), Included in OCI	0	1	0	(1)
Purchases	132	63	391	82
Settlements	(34)	(3)	(79)	(16)
Sales	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	(119)	(19)	(318)	(19)
Ending balance	354	141	354	141
Securities available-for-sale and other \| CMBS \| Total Fixed Maturities, AFS
Assets
Beginning balance	86	20	77	9
Total realized/unrealized gains (losses), Included in net income	0	0	0	0
Total realized/unrealized gains (losses), Included in OCI	0	2	2	2
Purchases	29	66	68	79
Settlements	0	(1)	(3)	(3)
Sales	0	0	0	0
Transfers into Level 3	0	5	5	5
Transfers out of Level 3	(14)	0	(48)	0
Ending balance	101	92	101	92
Securities available-for-sale and other \| Corporate \| Total Fixed Maturities, AFS
Assets
Beginning balance	1,141	1,109	881	732
Total realized/unrealized gains (losses), Included in net income	0	1	6	(31)
Total realized/unrealized gains (losses), Included in OCI	(7)	19	(18)	0
Purchases	156	45	405	161
Settlements	(29)	(62)	(105)	(126)
Sales	(1)	0	(45)	(27)
Transfers into Level 3	0	22	172	481
Transfers out of Level 3	(6)	(138)	(42)	(194)
Ending balance	1,254	996	1,254	996
Securities available-for-sale and other \| Municipal \| Total Fixed Maturities, AFS
Assets
Beginning balance		0		0
Total realized/unrealized gains (losses), Included in net income		(3)		(3)
Total realized/unrealized gains (losses), Included in OCI		2		2
Purchases		0		0
Settlements		0		0
Sales		0		0
Transfers into Level 3		7		7
Transfers out of Level 3		0		0
Ending balance		6		6
Securities available-for-sale and other \| Foreign government/government agencies \| Total Fixed Maturities, AFS
Assets
Beginning balance	0		6	3
Total realized/unrealized gains (losses), Included in net income	0		0	0
Total realized/unrealized gains (losses), Included in OCI	0		0	0
Purchases	5		5	0
Settlements	0		0	0
Sales	0		(6)	0
Transfers into Level 3	0		0	0
Transfers out of Level 3	0		0	(3)
Ending balance	5	0	5	0
Securities available-for-sale and other \| RMBS \| Total Fixed Maturities, AFS
Assets
Beginning balance	302	479	381	560
Total realized/unrealized gains (losses), Included in net income	0	0	0	0
Total realized/unrealized gains (losses), Included in OCI	(1)	2	(3)	(10)
Purchases	41	40	221	66
Settlements	(45)	(48)	(148)	(136)
Sales	0	0	(14)	(7)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	(29)	(22)	(169)	(22)
Ending balance	268	$ 451	268	$ 451
Fair Value Option, Other Eligible Items \| Collateralized Loan Obligations [Member] \| Total Fixed Maturities, AFS
Assets
Beginning balance	0		0
Total realized/unrealized gains (losses), Included in net income	0		0
Total realized/unrealized gains (losses), Included in OCI	0		0
Purchases	75		75
Settlements	0		0
Sales	0		0
Transfers into Level 3	0		0
Transfers out of Level 3	0		0
Ending balance	$ 75		$ 75

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

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Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (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 from derivative asset (liability) after deduction of derivative liability (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 a derivative asset (liability) after deduction of derivative liability (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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