Fair Value Measurements - Fair Value Recurring Basis, Unobservable Input (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Freestanding Derivatives, net
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	$ 2,004	$ 1,402	$ 1,805	1,502
Total realized/unrealized gains (losses), Included in net income	3	(25)	8	(42)
Total realized/unrealized gains (losses), Included in OCI	3	78	(11)	(34)
Purchases	380	88	751	220
Settlements	(158)	(78)	(242)	(168)
Sales	(47)	(19)	(64)	(34)
Transfers into Level 3	129	412	177	459
Transfers out of Level 3	(304)	(48)	(414)	(93)
Ending balance	2,010	1,810	2,010	1,810
Liabilities
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities	0	0	0	12
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
Ending balance		0		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		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	0	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		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		0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Equity Securities, at fair value
Assets
Beginning balance	70	69	70	73
Total realized/unrealized gains (losses), Included in net income	2	(3)	2	(10)
Total realized/unrealized gains (losses), Included in OCI	0	0	0	0
Purchases	3	0	3	3
Settlements	(1)	0	(1)	0
Sales	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Ending balance	74	66	74	66
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Short-term investments
Assets
Beginning balance	16	14	30	15
Total realized/unrealized gains (losses), Included in net income	0	0	0	0
Total realized/unrealized gains (losses), Included in OCI	0	0	0	0
Purchases	2	0	2	0
Settlements	0	0	(14)	(1)
Sales	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Ending balance	18	14	18	14
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Securities available-for-sale and other \| Total Fixed Maturities, AFS
Assets
Beginning balance	1,918	1,319	1,705	1,414
Total realized/unrealized gains (losses), Included in net income	1	(22)	6	(32)
Total realized/unrealized gains (losses), Included in OCI	3	78	(11)	(34)
Purchases	375	88	746	217
Settlements	(157)	(78)	(227)	(167)
Sales	(47)	(19)	(64)	(34)
Transfers into Level 3	129	412	177	459
Transfers out of Level 3	(304)	(48)	(414)	(93)
Ending balance	1,918	1,730	1,918	1,730
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Securities available-for-sale and other \| ABS \| Total Fixed Maturities, AFS
Assets
Beginning balance	6	19	0	15
Total realized/unrealized gains (losses), Included in net income	0	0	0	0
Total realized/unrealized gains (losses), Included in OCI	0	0	0	(1)
Purchases	13	23	19	43
Settlements	0	0	0	0
Sales	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	(5)	(19)	(5)	(34)
Ending balance	14	23	14	23
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Securities available-for-sale and other \| Collateralized Loan Obligations [Member] \| Total Fixed Maturities, AFS
Assets
Beginning balance	426	83	360	95
Total realized/unrealized gains (losses), Included in net income	0	0	0	0
Total realized/unrealized gains (losses), Included in OCI	0	4	0	(2)
Purchases	119	19	259	19
Settlements	(30)	(7)	(45)	(13)
Sales	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	(140)	0	(199)	0
Ending balance	375	99	375	99
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Securities available-for-sale and other \| CMBS \| Total Fixed Maturities, AFS
Assets
Beginning balance	61	18	77	9
Total realized/unrealized gains (losses), Included in net income	0	0	0	0
Total realized/unrealized gains (losses), Included in OCI	2	0	2	0
Purchases	38	3	39	13
Settlements	(1)	(1)	(3)	(2)
Sales	0	0	0	0
Transfers into Level 3	5	0	5	0
Transfers out of Level 3	(19)	0	(34)	0
Ending balance	86	20	86	20
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Securities available-for-sale and other \| Corporate \| Total Fixed Maturities, AFS
Assets
Beginning balance	944	709	881	732
Total realized/unrealized gains (losses), Included in net income	1	(22)	6	(32)
Total realized/unrealized gains (losses), Included in OCI	2	61	(11)	(19)
Purchases	176	22	249	116
Settlements	(69)	(28)	(76)	(64)
Sales	(37)	(19)	(44)	(27)
Transfers into Level 3	124	412	172	459
Transfers out of Level 3	0	(26)	(36)	(56)
Ending balance	1,141	1,109	1,141	1,109
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Securities available-for-sale and other \| Foreign government/government agencies \| Total Fixed Maturities, AFS
Assets
Beginning balance		3	6	3
Total realized/unrealized gains (losses), Included in net income		0	0	0
Total realized/unrealized gains (losses), Included in OCI		0	0	0
Purchases		0	0	0
Settlements		0	0	0
Sales		0	(6)	0
Transfers into Level 3		0	0	0
Transfers out of Level 3		(3)	0	(3)
Ending balance	0	0	0	0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Securities available-for-sale and other \| RMBS \| Total Fixed Maturities, AFS
Assets
Beginning balance	481	487	381	560
Total realized/unrealized gains (losses), Included in net income	0	0	0	0
Total realized/unrealized gains (losses), Included in OCI	(1)	13	(2)	(12)
Purchases	29	21	180	26
Settlements	(57)	(42)	(103)	(88)
Sales	(10)	0	(14)	(7)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	(140)	0	(140)	0
Ending balance	$ 302	$ 479	$ 302	$ 479

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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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 settlement 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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Fair value 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 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 purchases 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 sales 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 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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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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