Fair Value Measurements - Level 3 Financial Instruments (Details) - Level 3 - Assets measured on recurring basis - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Assets held in separate accounts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	$ 67	$ 11	$ 61	$ 11
Total Realized/Unrealized Gains (Losses) Included in Net Income	2	0	3	0
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	33	27	39	27
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Transfers in to Level 3	0	0	3	0
Transfers out of Level 3	0	0	(4)	0
Fair Value, assets, ending balance	102	38	102	38
Change in Unrealized Gains (Losses) Included in Earnings	0	0	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	(4)	(77)	(4)	(97)
Total Realized/Unrealized Gains (Losses) Included in Net Income	(15)	13	(14)	34
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	0	0	0	0
Issues	0	0	(1)	(1)
Sales	0	0	0	0
Settlements	0	1	0	1
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair Value, Derivatives, ending balance	(19)	(63)	(19)	(63)
Change In Unrealized Gains (Losses) Included in Earnings	0	0	0	0
FIA
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Derivatives, beginning balance	(11)	(18)	(11)	(20)
Total Realized/Unrealized Gains (Losses) Included in Net Income	2	(1)	1	(2)
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	0	0	0	0
Issues	(3)	0	(3)	1
Sales	0	0	0	0
Settlements	1	3	2	5
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair Value, Derivatives, ending balance	(11)	(16)	(11)	(16)
Change In Unrealized Gains (Losses) Included in Earnings	0	0	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	52	15	28	26
Total Realized/Unrealized Gains (Losses) Included in Net Income	0	0	0	0
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	1	0
Purchases	0	3	0	3
Issuances	0	0	0	0
Sales	0	0	0	(5)
Settlements	(5)	0	(5)	0
Transfers in to Level 3	0	0	23	0
Transfers out of Level 3	0	0	0	(6)
Fair Value, assets, ending balance	47	18	47	18
Change in Unrealized Gains (Losses) Included in Earnings	0	0	0	0
U.S. corporate private securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	888	651	771	642
Total Realized/Unrealized Gains (Losses) Included in Net Income	0	0	0	0
Total Realized/Unrealized Gains (Losses) Included in OCI	15	(3)	45	(18)
Purchases	0	91	102	103
Issuances	0	0	0	0
Sales	0	(5)	(6)	(5)
Settlements	(2)	(8)	(9)	(4)
Transfers in to Level 3	0	12	0	20
Transfers out of Level 3	(8)	0	(10)	0
Fair Value, assets, ending balance	893	738	893	738
Change in Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Foreign corporate private securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	122	101	124	92
Total Realized/Unrealized Gains (Losses) Included in Net Income	0	0	(17)	(9)
Total Realized/Unrealized Gains (Losses) Included in OCI	3	2	26	20
Purchases	49	75	97	75
Issuances	0	0	0	0
Sales	0	(56)	(56)	(56)
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, assets, ending balance	174	122	174	122
Change in Unrealized Gains (Losses) Included in Earnings	0	0	0	(9)
Residential mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	31	73	10	21
Total Realized/Unrealized Gains (Losses) Included in Net Income	(1)	(1)	(2)	(3)
Total Realized/Unrealized Gains (Losses) Included in OCI	0	(1)	0	0
Purchases	0	19	8	20
Issuances	0	0	0	0
Sales	0	(40)	0	0
Settlements	0	0	0	0
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	(14)	(17)	0	(5)
Fair Value, assets, ending balance	16	33	16	33
Change in Unrealized Gains (Losses) Included in Earnings	(1)	2	(2)	(3)
Commercial mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	11	0	12	7
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	0	16	0	16
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	(11)	0	(12)	(7)
Fair Value, assets, ending balance	0	16	0	16
Change in Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Other asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	89	126	94	43
Total Realized/Unrealized Gains (Losses) Included in Net Income	0	0	0	0
Total Realized/Unrealized Gains (Losses) Included in OCI	0	(1)	0	(2)
Purchases	12	57	11	57
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(1)	(1)	(1)	(2)
Transfers in to Level 3	0	21	0	22
Transfers out of Level 3	(40)	(105)	(44)	(21)
Fair Value, assets, ending balance	60	97	60	97
Change in Unrealized Gains (Losses) Included in Earnings	0	0	0	0
Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	1,193	966	1,039	831
Total Realized/Unrealized Gains (Losses) Included in Net Income	(1)	(1)	(19)	(12)
Total Realized/Unrealized Gains (Losses) Included in OCI	18	(3)	72	0
Purchases	61	261	218	274
Issuances	0	0	0	0
Sales	0	(101)	(62)	(66)
Settlements	(8)	(9)	(15)	(6)
Transfers in to Level 3	0	33	23	42
Transfers out of Level 3	(73)	(122)	(66)	(39)
Fair Value, assets, ending balance	1,190	1,024	1,190	1,024
Change in Unrealized Gains (Losses) Included in Earnings	(1)	2	(2)	(12)
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	80	48	50	50
Total Realized/Unrealized Gains (Losses) Included in Net Income	3	2	4	0
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0	0	0
Purchases	0	3	29	3
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	0
Fair Value, assets, ending balance	83	53	83	53
Change in Unrealized Gains (Losses) Included in Earnings	$ 3	2	$ 4	0
Short-term investments and cash equivalents
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		1		1
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		1		1
Change in Unrealized Gains (Losses) Included in Earnings		$ 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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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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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 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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