Fair Value Measurements - Fair Value Recurring Basis, Unobservable Input (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Liabilities
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss)	$ 12	$ (7)
Fair Value, Measurements, Recurring
Assets
Beginning balance	1,502	1,643
Total realized/unrealized gains (losses), Included in net income	(44)	(4)
Total realized/unrealized gains (losses), Included in OCI	25	9
Purchases	891	895
Settlements	(388)	(405)
Sales	(49)	(142)
Transfers into Level 3	507	61
Transfers out of Level 3	(639)	(555)
Ending balance	1,805	1,502
Fair Value, Measurements, Recurring \| Contingent Consideration
Liabilities
Beginning balance	(22)	(35)
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss)	12	(7)
Total realized/unrealized gains (losses), Included in OCI	0	0
Purchases	0	0
Settlements	10	20
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	0	(22)
Fair Value, Measurements, Recurring \| Liability [Member]
Liabilities
Beginning balance	(37)	(32)
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss)	48	(25)
Total realized/unrealized gains (losses), Included in OCI	0	0
Purchases	0	0
Settlements	(11)	20
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	0	(37)
Fair Value, Measurements, Recurring \| Other liabilities
Freestanding Derivatives, net
Beginning balance	(15)	3
Total realized/unrealized gains (losses), Included in net income	36	(18)
Total realized/unrealized gains (losses), Included in OCI	0	0
Purchases	0	0
Settlements	(21)	0
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	0	(15)
Fair Value, Measurements, Recurring \| Other investments
Freestanding Derivatives, net
Beginning balance	0	1
Total realized/unrealized gains (losses), Included in net income		(1)
Total realized/unrealized gains (losses), Included in OCI		0
Purchases		0
Settlements		0
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	(15)	3
Total realized/unrealized gains (losses), Included in net income	36	(18)
Total realized/unrealized gains (losses), Included in OCI	0	0
Purchases	0	0
Settlements	(21)	0
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	0	(15)
Fair Value, Measurements, Recurring \| Interest rate derivatives
Freestanding Derivatives, net
Beginning balance	0	1
Total realized/unrealized gains (losses), Included in net income		(1)
Total realized/unrealized gains (losses), Included in OCI		0
Purchases		0
Settlements		0
Sales		0
Transfers into Level 3		0
Transfers out of Level 3		0
Ending balance		0
Fair Value, Measurements, Recurring \| Equity securities
Assets
Beginning balance	73	77
Total realized/unrealized gains (losses), Included in net income		0
Total realized/unrealized gains (losses), Included in OCI		0
Purchases		9
Settlements		0
Sales		(13)
Transfers into Level 3		0
Transfers out of Level 3		0
Ending balance		73
Fair Value, Measurements, Recurring \| Equity securities \| Equity securities
Assets
Beginning balance	73
Total realized/unrealized gains (losses), Included in net income	(10)
Total realized/unrealized gains (losses), Included in OCI	0
Purchases	6
Settlements	0
Sales	0
Transfers into Level 3	1
Transfers out of Level 3	0
Ending balance	70	73
Fair Value, Measurements, Recurring \| Short-term Investments [Member]
Assets
Beginning balance	15	0
Total realized/unrealized gains (losses), Included in net income	0	0
Total realized/unrealized gains (losses), Included in OCI	0	0
Purchases	30	15
Settlements	(15)	0
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	30	15
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| Total fixed maturities
Assets
Beginning balance	1,414	1,565
Total realized/unrealized gains (losses), Included in net income	(34)	(3)
Total realized/unrealized gains (losses), Included in OCI	25	9
Purchases	855	871
Settlements	(373)	(405)
Sales	(49)	(129)
Transfers into Level 3	506	61
Transfers out of Level 3	(639)	(555)
Ending balance	1,705	1,414
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| ABS \| Total fixed maturities
Assets
Beginning balance	15	10
Total realized/unrealized gains (losses), Included in net income	0	0
Total realized/unrealized gains (losses), Included in OCI	(1)	0
Purchases	43	20
Settlements	0	(1)
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	(57)	(14)
Ending balance	0	15
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| CDOs \| Total fixed maturities
Assets
Beginning balance	95	100
Total realized/unrealized gains (losses), Included in net income	0	0
Total realized/unrealized gains (losses), Included in OCI	1	0
Purchases	389	329
Settlements	(43)	(127)
Sales	0	(6)
Transfers into Level 3	0	0
Transfers out of Level 3	(82)	(201)
Ending balance	360	95
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| CMBS \| Total fixed maturities
Assets
Beginning balance	9	12
Total realized/unrealized gains (losses), Included in net income	0	0
Total realized/unrealized gains (losses), Included in OCI	3	1
Purchases	79	34
Settlements	(5)	(4)
Sales	0	0
Transfers into Level 3	13	0
Transfers out of Level 3	(22)	(34)
Ending balance	77	9
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| Corporate \| Total fixed maturities
Assets
Beginning balance	732	520
Total realized/unrealized gains (losses), Included in net income	(31)	(4)
Total realized/unrealized gains (losses), Included in OCI	31	16
Purchases	272	354
Settlements	(143)	(59)
Sales	(36)	(88)
Transfers into Level 3	486	61
Transfers out of Level 3	(430)	(68)
Ending balance	881	732
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| Foreign government/government agencies \| Total fixed maturities
Assets
Beginning balance	3	3
Total realized/unrealized gains (losses), Included in net income	0	0
Total realized/unrealized gains (losses), Included in OCI	0	0
Purchases	6	0
Settlements	0	0
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	(3)	0
Ending balance	6	3
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| Municipal \| Total fixed maturities
Assets
Beginning balance	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	0
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| Residential mortgage-backed securities ("RMBS") \| Total fixed maturities
Assets
Beginning balance	560	920
Total realized/unrealized gains (losses), Included in net income	0	1
Total realized/unrealized gains (losses), Included in OCI	(11)	(8)
Purchases	66	134
Settlements	(182)	(214)
Sales	(7)	(35)
Transfers into Level 3	0	0
Transfers out of Level 3	(45)	(238)
Ending balance	$ 381	$ 560

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 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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