Fair Value Measurements - Fair Value Recurring Basis, Unobservable Input (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Liabilities
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss)	$ (7)	$ (6)
Contingent Consideration
Liabilities
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss)	(7)	(6)
Fair Value, Measurements, Recurring
Assets
Beginning balance		2,030
Total realized/unrealized gains (losses), Included in net income	(4)	32
Total realized/unrealized gains (losses), Included in OCI	9	(35)
Purchases	895	929
Settlements	(405)	(374)
Sales	(142)	(172)
Transfers into Level 3	61	47
Transfers out of Level 3	(555)	(811)
Freestanding Derivatives, net
Beginning balance	4	2
Total realized/unrealized gains (losses), Included in net income		3
Total realized/unrealized gains (losses), Included in OCI		0
Purchases		1
Settlements		0
Sales		(2)
Transfers into Level 3		0
Transfers out of Level 3		0
Ending balance		4
Fair Value, Measurements, Recurring \| Contingent Consideration
Liabilities
Beginning balance	(35)	(29)
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss)	(7)	(6)
Total realized/unrealized gains (losses), Included in OCI	0	0
Purchases	0	0
Settlements	20	0
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	(22)	(35)
Fair Value, Measurements, Recurring \| Liability [Member]
Liabilities
Beginning balance	(32)	(29)
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss)	(25)	(6)
Total realized/unrealized gains (losses), Included in OCI	0	0
Purchases	0	0
Settlements	20	0
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	(37)	(32)
Fair Value, Measurements, Recurring \| Derivative [Member]
Freestanding Derivatives, net
Beginning balance	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	1
Fair Value, Measurements, Recurring \| Derivative [Member] \| Liability [Member]
Freestanding Derivatives, net
Beginning balance	3
Total realized/unrealized gains (losses), Included in net income	(18)
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	(15)	3
Fair Value, Measurements, Recurring \| Equity
Freestanding Derivatives, net
Beginning balance	3	1
Total realized/unrealized gains (losses), Included in net income	(18)	3
Total realized/unrealized gains (losses), Included in OCI	0	0
Purchases	0	1
Settlements	0	0
Sales	0	(2)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	(15)	3
Fair Value, Measurements, Recurring \| Interest rate derivatives
Freestanding Derivatives, net
Beginning balance	1	1
Total realized/unrealized gains (losses), Included in net income	(1)	0
Total realized/unrealized gains (losses), Included in OCI	0	0
Purchases	0	0
Settlements	0	0
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	0	1
Fair Value, Measurements, Recurring \| Equity securities
Assets
Beginning balance	77	76
Total realized/unrealized gains (losses), Included in net income		29
Total realized/unrealized gains (losses), Included in OCI		0
Purchases		12
Settlements		0
Sales		(40)
Transfers into Level 3		0
Transfers out of Level 3		0
Ending balance		77
Fair Value, Measurements, Recurring \| Assets [Member]
Assets
Beginning balance	1,643
Ending balance	1,502	1,643
Fair Value, Measurements, Recurring \| Equity securities \| Short-term Investments [Member]
Assets
Beginning balance	0
Total realized/unrealized gains (losses), Included in net income	0
Total realized/unrealized gains (losses), Included in OCI	0
Purchases	15
Settlements	0
Sales	0
Transfers into Level 3	0
Transfers out of Level 3	0
Ending balance	15	0
Fair Value, Measurements, Recurring \| Equity securities \| Equity securities
Assets
Beginning balance	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	77
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| Total fixed maturities
Assets
Beginning balance	1,565	1,952
Total realized/unrealized gains (losses), Included in net income	(3)	0
Total realized/unrealized gains (losses), Included in OCI	9	(35)
Purchases	871	916
Settlements	(405)	(374)
Sales	(129)	(130)
Transfers into Level 3	61	47
Transfers out of Level 3	(555)	(811)
Ending balance	1,414	1,565
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| ABS \| Total fixed maturities
Assets
Beginning balance	10	19
Total realized/unrealized gains (losses), Included in net income	0	0
Total realized/unrealized gains (losses), Included in OCI	0	0
Purchases	20	90
Settlements	(1)	(5)
Sales	0	(4)
Transfers into Level 3	0	12
Transfers out of Level 3	(14)	(102)
Ending balance	15	10
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| CDOs \| Total fixed maturities
Assets
Beginning balance	100	95
Total realized/unrealized gains (losses), Included in net income	0	0
Total realized/unrealized gains (losses), Included in OCI	0	0
Purchases	329	330
Settlements	(127)	0
Sales	(6)	(13)
Transfers into Level 3	0	0
Transfers out of Level 3	(201)	(312)
Ending balance	95	100
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| CMBS \| Total fixed maturities
Assets
Beginning balance	12	69
Total realized/unrealized gains (losses), Included in net income	0	(1)
Total realized/unrealized gains (losses), Included in OCI	1	0
Purchases	34	25
Settlements	(4)	(14)
Sales	0	(8)
Transfers into Level 3	0	0
Transfers out of Level 3	(34)	(59)
Ending balance	9	12
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| Corporate \| Total fixed maturities
Assets
Beginning balance	520	520
Total realized/unrealized gains (losses), Included in net income	(4)	1
Total realized/unrealized gains (losses), Included in OCI	16	(18)
Purchases	354	197
Settlements	(59)	(36)
Sales	(88)	(52)
Transfers into Level 3	61	31
Transfers out of Level 3	(68)	(123)
Ending balance	732	520
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| Foreign government/government agencies \| Total fixed maturities
Assets
Beginning balance	3	2
Total realized/unrealized gains (losses), Included in net income	0	0
Total realized/unrealized gains (losses), Included in OCI	0	0
Purchases	0	1
Settlements	0	0
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	3	3
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| Municipal \| Total fixed maturities
Assets
Beginning balance	0	17
Total realized/unrealized gains (losses), Included in net income		0
Total realized/unrealized gains (losses), Included in OCI		(1)
Purchases		0
Settlements		0
Sales		(1)
Transfers into Level 3		0
Transfers out of Level 3		(15)
Ending balance		0
Fair Value, Measurements, Recurring \| Securities available-for-sale and other \| Residential mortgage-backed securities (RMBS) \| Total fixed maturities
Assets
Beginning balance	920	1,230
Total realized/unrealized gains (losses), Included in net income	1	0
Total realized/unrealized gains (losses), Included in OCI	(8)	(16)
Purchases	134	273
Settlements	(214)	(319)
Sales	(35)	(52)
Transfers into Level 3	0	4
Transfers out of Level 3	(238)	(200)
Ending balance	560	920
Previously Reported [Member] \| Fair Value, Measurements, Recurring
Assets
Beginning balance	1,646
Ending balance		1,646
Previously Reported [Member] \| Fair Value, Measurements, Recurring \| Liability [Member]
Liabilities
Beginning balance	$ (35)
Ending balance		$ (35)

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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Amount of transfers of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset) out of level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as 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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