Fair Value Measurements - Level 3 Financial Instruments (Details) - Assets measured on recurring basis - Level 3 - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 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	$ 141	$ 67	$ 115	$ 61
Total Realized/Unrealized Gains (Losses) Included in Net Income	2	2	0	3
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	33	33	80	39
Issuances	0	0	0	0
Sales	0	0	(1)	0
Settlements	0	0	0	0
Transfers in to Level 3	3	0	3	3
Transfers out of Level 3	(5)	0	(23)	(4)
Fair Value, assets, ending balance	174	102	174	102
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	(193)	(4)	(22)	(4)
Total Realized/Unrealized Gains (Losses) Included in Net Income	40	(15)	(131)	(14)
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	0	0	0	0
Issues	(1)	0	(1)	(1)
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	(154)	(19)	(154)	(19)
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	(9)	(11)	(11)	(11)
Total Realized/Unrealized Gains (Losses) Included in Net Income	(1)	2	1	1
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	0	0	0	0
Issues	(1)	(3)	(1)	(3)
Sales	0	0	0	0
Settlements	1	1	1	2
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair Value, Derivatives, ending balance	(10)	(11)	(10)	(11)
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	44	52	47	28
Total Realized/Unrealized Gains (Losses) Included in Net Income	0	0	0	0
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	(1)	1
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	(5)	(2)	(5)
Transfers in to Level 3	17	0	17	23
Transfers out of Level 3	0	0	0	0
Fair Value, assets, ending balance	61	47	61	47
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		(1)
U.S. corporate private securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	891	888	1,002	771
Total Realized/Unrealized Gains (Losses) Included in Net Income	0	0	1	0
Total Realized/Unrealized Gains (Losses) Included in OCI	57	15	7	45
Purchases	20	0	46	102
Issuances	0	0	0	0
Sales	(9)	0	(10)	(6)
Settlements	(32)	(2)	(76)	(9)
Transfers in to Level 3	67	0	64	0
Transfers out of Level 3	(29)	(8)	(69)	(10)
Fair Value, assets, ending balance	965	893	965	893
Change in Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	57		7
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	3		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	(3)		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	159	122	190	124
Total Realized/Unrealized Gains (Losses) Included in Net Income	0	0	(1)	(17)
Total Realized/Unrealized Gains (Losses) Included in OCI	17	3	(10)	26
Purchases	0	49	2	97
Issuances	0	0	0	0
Sales	0	0	(4)	(56)
Settlements	(2)	0	(1)	0
Transfers in to Level 3	5	0	3	0
Transfers out of Level 3	0	0	0	0
Fair Value, assets, ending balance	179	174	179	174
Change in Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	17		(10)
Residential mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	15	31	16	10
Total Realized/Unrealized Gains (Losses) Included in Net Income	(1)	(1)	(1)	(2)
Total Realized/Unrealized Gains (Losses) Included in OCI	1	0	0	0
Purchases	23	0	22	8
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	(8)	(14)	(7)	0
Fair Value, assets, ending balance	30	16	30	16
Change in Unrealized Gains (Losses) Included in Earnings	(1)	(1)	(1)	(2)
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		11		12
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		(11)		(12)
Fair Value, assets, ending balance		0		0
Change in Unrealized Gains (Losses) Included in Earnings		0		0
Other asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	55	89	48	94
Total Realized/Unrealized Gains (Losses) Included in Net Income	0	0	0	0
Total Realized/Unrealized Gains (Losses) Included in OCI	1	0	0	0
Purchases	(4)	12	4	11
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(1)	(1)	(1)	(1)
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	(40)	0	(44)
Fair Value, assets, ending balance	51	60	51	60
Change in Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	1		0
Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	1,167	1,193	1,303	1,039
Total Realized/Unrealized Gains (Losses) Included in Net Income	(1)	(1)	(1)	(19)
Total Realized/Unrealized Gains (Losses) Included in OCI	76	18	(4)	72
Purchases	39	61	74	218
Issuances	0	0	0	0
Sales	(9)	0	(14)	(62)
Settlements	(35)	(8)	(80)	(15)
Transfers in to Level 3	89	0	84	23
Transfers out of Level 3	(40)	(73)	(76)	(66)
Fair Value, assets, ending balance	1,286	1,190	1,286	1,190
Change in Unrealized Gains (Losses) Included in Earnings	(1)	(1)	(1)	(2)
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	75		(4)
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	58	80	63	50
Total Realized/Unrealized Gains (Losses) Included in Net Income	7	3	2	4
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	30	0	30	29
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(1)	0	(1)	0
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair Value, assets, ending balance	94	83	94	83
Change in Unrealized Gains (Losses) Included in Earnings	6	$ 3	2	$ 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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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
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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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