Fair Value Measurements - Level 3 Financial Instruments (Details) - Assets measured on recurring basis - Level 3 - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
U.S. corporate public securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Fair Value, beginning balance	$ 28	$ 26
Total Realized/Unrealized Gains (Losses) Included in Net Income	0	0
Total Realized/Unrealized Gains (Losses) Included in OCI	3	0
Purchases	0	22
Issuances	0	0
Sales	0	(5)
Settlements	(7)	0
Transfers in to Level 3	23	0
Transfers out of Level 3	0	(15)
Assets, Fair Value, ending balance	47	28
Change in Unrealized Gains (Losses) Included in Earnings(4)	0	0
U.S. corporate private securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Fair Value, beginning balance	771	642
Total Realized/Unrealized Gains (Losses) Included in Net Income	(1)	0
Total Realized/Unrealized Gains (Losses) Included in OCI	62	(31)
Purchases	246	184
Issuances	0	0
Sales	(14)	(4)
Settlements	(61)	(32)
Transfers in to Level 3	8	20
Transfers out of Level 3	(9)	(8)
Assets, Fair Value, ending balance	1,002	771
Change in Unrealized Gains (Losses) Included in Earnings(4)	(1)	0
Foreign corporate private securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Fair Value, beginning balance	124	92
Total Realized/Unrealized Gains (Losses) Included in Net Income	(17)	(9)
Total Realized/Unrealized Gains (Losses) Included in OCI	31	14
Purchases	108	93
Issuances	0	0
Sales	(56)	(56)
Settlements	0	(10)
Transfers in to Level 3	0	0
Transfers out of Level 3	0	0
Assets, Fair Value, ending balance	190	124
Change in Unrealized Gains (Losses) Included in Earnings(4)	1	(9)
Residential mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Fair Value, beginning balance	10	21
Total Realized/Unrealized Gains (Losses) Included in Net Income	(3)	(5)
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0
Purchases	9	41
Issuances	0	0
Sales	0	(40)
Settlements	0	0
Transfers in to Level 3	0	0
Transfers out of Level 3	0	(7)
Assets, Fair Value, ending balance	16	10
Change in Unrealized Gains (Losses) Included in Earnings(4)	(4)	(5)
Commercial mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Fair Value, beginning balance	12	7
Total Realized/Unrealized Gains (Losses) Included in Net Income	0	0
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0
Purchases	0	13
Issuances	0	0
Sales	0	0
Settlements	0	(1)
Transfers in to Level 3	0	0
Transfers out of Level 3	(12)	(7)
Assets, Fair Value, ending balance	0	12
Change in Unrealized Gains (Losses) Included in Earnings(4)	0	0
Other asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Fair Value, beginning balance	94	43
Total Realized/Unrealized Gains (Losses) Included in Net Income	0	0
Total Realized/Unrealized Gains (Losses) Included in OCI	0	(2)
Purchases	0	56
Issuances	0	0
Sales	0	0
Settlements	(2)	(4)
Transfers in to Level 3	0	22
Transfers out of Level 3	(44)	(21)
Assets, Fair Value, ending balance	48	94
Change in Unrealized Gains (Losses) Included in Earnings(4)	0	0
Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Fair Value, beginning balance	1,039	831
Total Realized/Unrealized Gains (Losses) Included in Net Income	(21)	(14)
Total Realized/Unrealized Gains (Losses) Included in OCI	96	(19)
Purchases	363	409
Issuances	0	0
Sales	(70)	(105)
Settlements	(70)	(47)
Transfers in to Level 3	31	42
Transfers out of Level 3	(65)	(58)
Assets, Fair Value, ending balance	1,303	1,039
Change in Unrealized Gains (Losses) Included in Earnings(4)	(4)	(14)
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Fair Value, beginning balance	50	50
Total Realized/Unrealized Gains (Losses) Included in Net Income	(16)	(4)
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0
Purchases	29	4
Issuances	0	0
Sales	0	0
Settlements	0	0
Transfers in to Level 3	0	0
Transfers out of Level 3	0	0
Assets, Fair Value, ending balance	63	50
Change in Unrealized Gains (Losses) Included in Earnings(4)	(16)	(4)
Stabilizer and MCGs
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Derivatives, beginning balance	(4)	(97)
Total Realized/Unrealized Gains (Losses) Included in Net Income	(16)	96
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0
Purchases	0	0
Issues	(2)	(3)
Sales	0	0
Settlements	0	0
Transfers in to Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, Derivatives, ending balance	(22)	(4)
Guaranteed benefit derivatives, Change in Unrealized Gains (Losses) Included in Earnings	0	0
FIA
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Derivatives, beginning balance	(11)	(20)
Total Realized/Unrealized Gains (Losses) Included in Net Income	5	(2)
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0
Purchases	0	0
Issues	(5)	2
Sales	0	0
Settlements	0	9
Transfers in to Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, Derivatives, ending balance	(11)	(11)
Guaranteed benefit derivatives, Change in Unrealized Gains (Losses) Included in Earnings	0	0
Separate Accounts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets, Fair Value, beginning balance	61	11
Total Realized/Unrealized Gains (Losses) Included in Net Income	4	0
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0
Purchases	79	67
Issuances	0	0
Sales	(2)	(6)
Settlements	0	0
Transfers in to Level 3	3	0
Transfers out of Level 3	(30)	(11)
Assets, Fair Value, ending balance	115	61
Change in Unrealized Gains (Losses) Included in Earnings(4)	$ 0	$ 0

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
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-Topic 820
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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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Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs, Change in Unrealized Gain (Loss)

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