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
Mar. 31, 2020	Mar. 31, 2019
Assets
Beginning balance	$ 1,502	$ 1,646
Total realized/unrealized gains (losses), Included in net income	(17)	(4)
Total realized/unrealized gains (losses), Included in OCI	(112)	6
Purchases	132	121
Settlements	(90)	(58)
Sales	(15)	(74)
Transfers into Level 3	47	12
Transfers out of Level 3	(45)	(141)
Ending balance	1,402	1,508
Liabilities
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities	12	(4)
Freestanding Derivatives, net
Beginning balance		(4)
Realized/unrealized gain/loss included in net income, liabilities		3
Realized/unrealized gain/loss included in OCI, liabilities		0
Purchases		0
Settlements		0
Sales		0
Transfers into level 3		0
Transfers out of level 3		0
Ending balance		(1)
Contingent Consideration
Liabilities
Beginning balance	(22)	(35)
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities	12	(4)
Total realized/unrealized gains (losses), Included in OCI	0	0
Purchases	0	0
Settlements	10	10
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	0	(29)
Liability [Member]
Liabilities
Beginning balance	(37)	(35)
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities	48	(4)
Total realized/unrealized gains (losses), Included in OCI	0	0
Purchases	0	0
Settlements	10	10
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales	(21)	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	0	(29)
Equity
Freestanding Derivatives, net
Beginning balance		(3)
Realized/unrealized gain/loss included in net income, liabilities		2
Realized/unrealized gain/loss included in OCI, liabilities		0
Purchases		0
Settlements		0
Sales		0
Transfers into level 3		0
Transfers out of level 3		0
Ending balance		(1)
Equity \| Liability [Member]
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	0
Sales	21
Transfers into level 3	0
Transfers out of level 3	0
Ending balance	0
Interest rate derivatives
Freestanding Derivatives, net
Beginning balance		(1)
Realized/unrealized gain/loss included in net income, liabilities		1
Realized/unrealized gain/loss included in OCI, liabilities		0
Purchases		0
Settlements		0
Sales		0
Transfers into level 3		0
Transfers out of level 3		0
Ending balance		0
Derivative [Member] \| Liability [Member]
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	0
Sales	(21)
Transfers into level 3	0
Transfers out of level 3	0
Ending balance	0
Equity Securities, at fair value
Assets
Beginning balance	73
Total realized/unrealized gains (losses), Included in net income	(7)
Total realized/unrealized gains (losses), Included in OCI	0
Purchases	3
Settlements	0
Sales	0
Transfers into Level 3	0
Transfers out of Level 3	0
Ending balance	69
Short-term investments
Assets
Beginning balance	15
Total realized/unrealized gains (losses), Included in net income	0
Total realized/unrealized gains (losses), Included in OCI	0
Purchases	0
Settlements	(1)
Sales	0
Transfers into Level 3	0
Transfers out of Level 3	0
Ending balance	14
Securities available-for-sale and other \| Total fixed maturities, FVO
Assets
Beginning balance	1,414	1,565
Total realized/unrealized gains (losses), Included in net income	(10)	0
Total realized/unrealized gains (losses), Included in OCI	(112)	6
Purchases	129	116
Settlements	(89)	(58)
Sales	(15)	(66)
Transfers into Level 3	47	12
Transfers out of Level 3	(45)	(141)
Ending balance	1,319	1,434
Securities available-for-sale and other \| ABS \| Total fixed maturities, FVO
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	20	0
Settlements	0	(1)
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	(15)	0
Ending balance	19	9
Securities available-for-sale and other \| CLOs \| Total fixed maturities, FVO
Assets
Beginning balance	95	100
Total realized/unrealized gains (losses), Included in net income	0	0
Total realized/unrealized gains (losses), Included in OCI	(6)	0
Purchases	0	35
Settlements	(6)	0
Sales	0	(6)
Transfers into Level 3	0	0
Transfers out of Level 3	0	(15)
Ending balance	83	114
Securities available-for-sale and other \| CMBS \| Total fixed maturities, FVO
Assets
Beginning balance	9	12
Total realized/unrealized gains (losses), Included in net income	0	0
Total realized/unrealized gains (losses), Included in OCI	0	1
Purchases	10	0
Settlements	(1)	(1)
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	18	12
Securities available-for-sale and other \| Corporate \| Total fixed maturities, FVO
Assets
Beginning balance	732	520
Total realized/unrealized gains (losses), Included in net income	(10)	(1)
Total realized/unrealized gains (losses), Included in OCI	(80)	7
Purchases	94	37
Settlements	(36)	(2)
Sales	(8)	(25)
Transfers into Level 3	47	12
Transfers out of Level 3	(30)	(23)
Ending balance	709	525
Securities available-for-sale and other \| Foreign government/government agencies \| Total fixed maturities, FVO
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	0	0
Settlements	0	0
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	3	3
Securities available-for-sale and other \| RMBS \| Total fixed maturities, FVO
Assets
Beginning balance	560	920
Total realized/unrealized gains (losses), Included in net income	0	1
Total realized/unrealized gains (losses), Included in OCI	(25)	(2)
Purchases	5	44
Settlements	(46)	(54)
Sales	(7)	(35)
Transfers into Level 3	0	0
Transfers out of Level 3	0	(103)
Ending balance	$ 487	771
Equity Securities, at fair value
Assets
Beginning balance		77
Total realized/unrealized gains (losses), Included in net income		(1)
Total realized/unrealized gains (losses), Included in OCI		0
Purchases		5
Settlements		0
Sales		(8)
Transfers into Level 3		0
Transfers out of Level 3		0
Ending balance		$ 73

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 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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- Details

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