Fair Value Measurements - Level 3 Financial Instruments (Details) - Assets measured on recurring basis - Level 3 - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Assets held in separate accounts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	$ 174	$ 102	$ 115	$ 61
Total Realized/Unrealized Gains (Losses) Included in Net Income	3	1	3	4
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	43	12	123	51
Issuances	0	0	0	0
Sales	(1)	(1)	(2)	(1)
Settlements	0	0	0	0
Transfers in to Level 3	1	0	4	3
Transfers out of Level 3	(13)	(14)	(36)	(18)
Fair Value, assets, ending balance	207	100	207	100
Change in Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0		0
Stabilizer (Investment Only) and MCG Contracts
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Derivatives, beginning balance	(154)	(19)	(22)	(4)
Total Realized/Unrealized Gains (Losses) Included in Net Income	29	(37)	(102)	(51)
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	0	0	0	0
Issues	0	(1)	(1)	(2)
Sales	0	0	0	0
Settlements	0	0	0	0
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair Value, Derivatives, ending balance	(125)	(57)	(125)	(57)
Change In Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0		0
FIA
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Derivatives, beginning balance	(10)	(11)	(11)	(11)
Total Realized/Unrealized Gains (Losses) Included in Net Income	2	1	3	2
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	0	0	0	0
Issues	(1)	(1)	(2)	(4)
Sales	0	0	0	0
Settlements	0	1	1	3
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair Value, Derivatives, ending balance	(9)	(10)	(9)	(10)
Change In Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0		0
U.S. corporate public securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	61	47	47	28
Total Realized/Unrealized Gains (Losses) Included in Net Income	0	0	0	0
Total Realized/Unrealized Gains (Losses) Included in OCI	3	2	3	3
Purchases	3	0	3	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(1)	(1)	(4)	(6)
Transfers in to Level 3	28	0	27	23
Transfers out of Level 3	(18)	0	0	0
Fair Value, assets, ending balance	76	48	76	48
Change in Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	3		3
U.S. corporate private securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	965	893	1,002	771
Total Realized/Unrealized Gains (Losses) Included in Net Income	0	0	1	0
Total Realized/Unrealized Gains (Losses) Included in OCI	7	23	26	68
Purchases	37	103	88	205
Issuances	0	0	0	0
Sales	0	0	(10)	(6)
Settlements	(10)	(46)	(80)	(55)
Transfers in to Level 3	243	6	284	5
Transfers out of Level 3	(63)	0	(132)	(9)
Fair Value, assets, ending balance	1,179	979	1,179	979
Change in Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	7		26
Foreign corporate public securities and foreign governments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	0		0
Total Realized/Unrealized Gains (Losses) Included in Net Income	0		0
Total Realized/Unrealized Gains (Losses) Included in OCI	0		0
Purchases	0		0
Issuances	0		0
Sales	0		0
Settlements	0		0
Transfers in to Level 3	0		0
Transfers out of Level 3	0		0
Fair Value, assets, ending balance	0		0
Change in Unrealized Gains (Losses) Included in Earnings	0		0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0		0
Foreign corporate private securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	179	174	190	124
Total Realized/Unrealized Gains (Losses) Included in Net Income	(1)	0	1	(17)
Total Realized/Unrealized Gains (Losses) Included in OCI	(15)	2	(27)	28
Purchases	165	5	175	102
Issuances	0	0	0	0
Sales	(8)	0	(10)	(56)
Settlements	0	0	(2)	0
Transfers in to Level 3	12	0	4	0
Transfers out of Level 3	(45)	0	(44)	0
Fair Value, assets, ending balance	287	181	287	181
Change in Unrealized Gains (Losses) Included in Earnings	0	0	1	0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	(16)		(26)
Residential mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	30	16	16	10
Total Realized/Unrealized Gains (Losses) Included in Net Income	(1)	(1)	(3)	(3)
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	0	13	19	14
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	(4)	(7)	(7)	0
Fair Value, assets, ending balance	25	21	25	21
Change in Unrealized Gains (Losses) Included in Earnings	(1)	(1)	(2)	(3)
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0		0
Commercial mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	0	0	0	12
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	4	10	4	10
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	(12)
Fair Value, assets, ending balance	4	10	4	10
Change in Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0		0
Other asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	51	60	48	94
Total Realized/Unrealized Gains (Losses) Included in Net Income	0	0	0	0
Total Realized/Unrealized Gains (Losses) Included in OCI	0	1	0	1
Purchases	5	22	9	21
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(13)	(1)	(14)	(2)
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	(12)	0	(44)
Fair Value, assets, ending balance	43	70	43	70
Change in Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0		0
Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	1,286	1,190	1,303	1,039
Total Realized/Unrealized Gains (Losses) Included in Net Income	(2)	(1)	(1)	(20)
Total Realized/Unrealized Gains (Losses) Included in OCI	(5)	28	2	100
Purchases	214	153	298	352
Issuances	0	0	0	0
Sales	(8)	0	(20)	(62)
Settlements	(24)	(48)	(100)	(63)
Transfers in to Level 3	283	6	315	28
Transfers out of Level 3	(130)	(19)	(183)	(65)
Fair Value, assets, ending balance	1,614	1,309	1,614	1,309
Change in Unrealized Gains (Losses) Included in Earnings	(1)	(1)	(1)	(3)
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	(6)		3
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	94	83	63	50
Total Realized/Unrealized Gains (Losses) Included in Net Income	3	0	6	4
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	1	0	31	29
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	(2)	0
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair Value, assets, ending balance	98	83	98	83
Change in Unrealized Gains (Losses) Included in Earnings	3	$ 0	6	$ 4
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	$ 0		$ 0

Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset (liability) measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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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 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 issuances 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 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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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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No definition available.

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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
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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 issuances 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 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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Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held.

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Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs, Change in Unrealized Gain (Loss)

+ References

No definition available.

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