Fair Value Measurements - Fair Value Recurring Basis, Unobservable Input (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Freestanding Derivatives, net
Realized/unrealized gain/loss included in OCI, liabilities		$ 0
Purchases		0
Sales		0
Transfers into level 3		0
Transfers out of level 3		0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3)
Assets
Beginning balance	$ 1,805	1,502
Total realized/unrealized gains (losses), Included in net income	5	(17)
Total realized/unrealized gains (losses), Included in OCI	(14)	(112)
Purchases	371	132
Settlements	(84)	(90)
Sales	(17)	(15)
Transfers into Level 3	48	47
Transfers out of Level 3	(110)	(45)
Ending balance	2,004	1,402
Liabilities
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities	0	12
Freestanding Derivatives, net
Beginning balance		15
Realized/unrealized gain/loss included in net income, liabilities		36
Settlements		0
Ending balance		0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Other liabilities
Freestanding Derivatives, net
Settlements	(21)
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| 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
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Contingent Consideration
Liabilities
Beginning balance		(22)
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities	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
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| 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
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Equity Securities, at fair value
Assets
Beginning balance	70
Total realized/unrealized gains (losses), Included in net income	0
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	70
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Short-term investments
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	0	0
Settlements	(14)	(1)
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	16	14
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Securities available-for-sale and other \| Total fixed maturities, FVO
Assets
Beginning balance	1,705	1,414
Total realized/unrealized gains (losses), Included in net income	5	(10)
Total realized/unrealized gains (losses), Included in OCI	(14)	(112)
Purchases	371	129
Settlements	(70)	(89)
Sales	(17)	(15)
Transfers into Level 3	48	47
Transfers out of Level 3	(110)	(45)
Ending balance	1,918	1,319
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Securities available-for-sale and other \| ABS \| Total fixed maturities, FVO
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	6	20
Settlements	0	0
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	(15)
Ending balance	6	19
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Securities available-for-sale and other \| CLOs \| Total fixed maturities, FVO
Assets
Beginning balance	360	95
Total realized/unrealized gains (losses), Included in net income	0	0
Total realized/unrealized gains (losses), Included in OCI	0	(6)
Purchases	140	0
Settlements	(15)	(6)
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	(59)	0
Ending balance	426	83
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Securities available-for-sale and other \| CMBS \| Total fixed maturities, FVO
Assets
Beginning balance	77	9
Total realized/unrealized gains (losses), Included in net income	0	0
Total realized/unrealized gains (losses), Included in OCI	0	0
Purchases	1	10
Settlements	(2)	(1)
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	(15)	0
Ending balance	61	18
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Securities available-for-sale and other \| Corporate \| Total fixed maturities, FVO
Assets
Beginning balance	881	732
Total realized/unrealized gains (losses), Included in net income	5	(10)
Total realized/unrealized gains (losses), Included in OCI	(13)	(80)
Purchases	73	94
Settlements	(7)	(36)
Sales	(7)	(8)
Transfers into Level 3	48	47
Transfers out of Level 3	(36)	(30)
Ending balance	944	709
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Securities available-for-sale and other \| Foreign government/government agencies \| Total fixed maturities, FVO
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	0	0
Settlements	0	0
Sales	(6)	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	0	3
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Securities available-for-sale and other \| RMBS \| Total fixed maturities, FVO
Assets
Beginning balance	381	560
Total realized/unrealized gains (losses), Included in net income	0	0
Total realized/unrealized gains (losses), Included in OCI	(1)	(25)
Purchases	151	5
Settlements	(46)	(46)
Sales	(4)	(7)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	$ 481	487
Equity Securities, at fair value \| Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3)
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

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 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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