Fair Value Measurements - Fair Value Recurring Basis, Unobservable Input (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Liabilities
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss)	$ 0	$ 12
Fair Value, Measurements, Recurring
Assets
Beginning balance	1,805	1,502
Total realized/unrealized gains (losses), Included in net income	50	(44)
Total realized/unrealized gains (losses), Included in OCI	(38)	25
Purchases	2,145	891
Settlements	(570)	(388)
Sales	(72)	(49)
Transfers into Level 3	177	507
Transfers out of Level 3	(789)	(639)
Ending balance	2,708	1,805
Fair Value, Measurements, Recurring \| Contingent Consideration
Liabilities
Beginning balance	0	(22)
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss)	0	12
Total realized/unrealized gains (losses), Included in OCI		0
Purchases		0
Settlements		10
Sales		0
Transfers into Level 3		0
Transfers out of Level 3		0
Ending balance		0
Fair Value, Measurements, Recurring \| Liability [Member]
Liabilities
Beginning balance	0	(37)
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss)		48
Total realized/unrealized gains (losses), Included in OCI		0
Purchases		0
Settlements		(11)
Sales		0
Transfers into Level 3		0
Transfers out of Level 3		0
Ending balance		0
Fair Value, Measurements, Recurring \| Other liabilities
Freestanding Derivatives, net
Beginning balance	0	(15)
Total realized/unrealized gains (losses), Included in net income		36
Total realized/unrealized gains (losses), Included in OCI		0
Purchases		0
Settlements		(21)
Sales		0
Transfers into Level 3		0
Transfers out of Level 3		0
Ending balance		0
Fair Value, Measurements, Recurring \| Equity
Freestanding Derivatives, net
Beginning balance	0	(15)
Total realized/unrealized gains (losses), Included in net income		36
Total realized/unrealized gains (losses), Included in OCI		0
Purchases		0
Settlements		(21)
Sales		0
Transfers into Level 3		0
Transfers out of Level 3		0
Ending balance		0
Fair Value, Measurements, Recurring \| Equity Securities [Member]
Assets
Beginning balance	70	73
Total realized/unrealized gains (losses), Included in net income	42	(10)
Total realized/unrealized gains (losses), Included in OCI	0	0
Purchases	6	6
Settlements	(53)	0
Sales	(1)	0
Transfers into Level 3	0	1
Transfers out of Level 3	0	0
Ending balance	64	70
Fair Value, Measurements, Recurring \| Short-term Investments [Member]
Assets
Beginning balance	30	15
Total realized/unrealized gains (losses), Included in net income	0	0
Total realized/unrealized gains (losses), Included in OCI	0	0
Purchases	98	30
Settlements	(48)	(15)
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	80	30
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| Total fixed maturities
Assets
Beginning balance	1,705	1,414
Total realized/unrealized gains (losses), Included in net income	14	(34)
Total realized/unrealized gains (losses), Included in OCI	(38)	25
Purchases	1,881	855
Settlements	(475)	(373)
Sales	(71)	(49)
Transfers into Level 3	177	506
Transfers out of Level 3	(789)	(639)
Ending balance	2,404	1,705
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| ABS \| Total fixed maturities
Assets
Beginning balance	0	15
Total realized/unrealized gains (losses), Included in net income	0	0
Total realized/unrealized gains (losses), Included in OCI	0	(1)
Purchases	42	43
Settlements	0	0
Sales	(3)	0
Transfers into Level 3	0	0
Transfers out of Level 3	(39)	(57)
Ending balance	0	0
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| CLOs \| Total fixed maturities
Assets
Beginning balance	360	95
Total realized/unrealized gains (losses), Included in net income	0	0
Total realized/unrealized gains (losses), Included in OCI	(1)	1
Purchases	471	389
Settlements	(124)	(43)
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	(449)	(82)
Ending balance	257	360
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| CMBS \| Total fixed maturities
Assets
Beginning balance	77	9
Total realized/unrealized gains (losses), Included in net income	0	0
Total realized/unrealized gains (losses), Included in OCI	1	3
Purchases	166	79
Settlements	(4)	(5)
Sales	(1)	0
Transfers into Level 3	5	13
Transfers out of Level 3	(48)	(22)
Ending balance	196	77
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| Corporate \| Total fixed maturities
Assets
Beginning balance	881	732
Total realized/unrealized gains (losses), Included in net income	14	(31)
Total realized/unrealized gains (losses), Included in OCI	(34)	31
Purchases	828	272
Settlements	(154)	(143)
Sales	(47)	(36)
Transfers into Level 3	172	486
Transfers out of Level 3	(42)	(430)
Ending balance	1,618	881
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| Foreign government/government agencies \| Total fixed maturities
Assets
Beginning balance	6	3
Total realized/unrealized gains (losses), Included in net income	0	0
Total realized/unrealized gains (losses), Included in OCI	0	0
Purchases	5	6
Settlements	0	0
Sales	(6)	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	(3)
Ending balance	5	6
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| Municipal \| Total fixed maturities
Assets
Beginning balance	0	0
Total realized/unrealized gains (losses), Included in net income		(3)
Total realized/unrealized gains (losses), Included in OCI		2
Purchases		0
Settlements		0
Sales		(6)
Transfers into Level 3		7
Transfers out of Level 3		0
Ending balance		0
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| Residential mortgage-backed securities ("RMBS") \| Total fixed maturities
Assets
Beginning balance	381	560
Total realized/unrealized gains (losses), Included in net income	0	0
Total realized/unrealized gains (losses), Included in OCI	(4)	(11)
Purchases	369	66
Settlements	(193)	(182)
Sales	(14)	(7)
Transfers into Level 3	0	0
Transfers out of Level 3	(211)	(45)
Ending balance	328	381
Fair Value, Measurements, Recurring \| Fair Value Option, Other Eligible Items \| CLOs \| Total fixed maturities
Assets
Beginning balance	0
Total realized/unrealized gains (losses), Included in net income	(6)
Total realized/unrealized gains (losses), Included in OCI	0
Purchases	160
Settlements	6
Sales	0
Transfers into Level 3	0
Transfers out of Level 3	0
Ending balance	$ 160	$ 0

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 sale 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 settlements of financial instrument classified as a liability 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 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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Amount of sales 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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Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, 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 a derivative asset (liability) after deduction of derivative liability (asset) into level 3 of the fair value hierarchy.

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