Fair Value Measurements (excluding Consolidated Investment Entities) - Level 3 Financial Instruments (Details) - Measured at fair value on a recurring basis - Level 3 - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Assets held in separate accounts
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	$ 116.0	$ 62.0
Total Realized/Unrealized Gains (Losses) Included in Net income	(3.0)	1.0
Total Realized/Unrealized Gains (Losses) Included in OCI	0.0	0.0
Purchases	47.0	6.0
Issuances	0.0	0.0
Sales	(1.0)	0.0
Settlements	0.0	0.0
Transfers in to Level 3	0.0	3.0
Transfers out of Level 3	(18.0)	(5.0)
Fair Value, Assets, ending balance	141.0	67.0
Change In Unrealized Gains (Losses) Included in Earnings	0.0	0.0
Other derivatives, net
Fixed Maturities and Equity Securities Rollforward:
Change In Unrealized Gains (Losses) Included in OCI	0.0
IUL
Derivatives Rollforward:
Change In Unrealized Gains (Losses) Included in OCI	0.0
Guaranteed benefit derivatives
Derivatives Rollforward:
Fair Value, Derivatives, beginning balance	(60.0)	(44.0)
Total Realized/Unrealized Gains (Losses) Included in Net income	(193.0)	5.0
Total Realized/Unrealized Gains (Losses) Included in OCI	0.0	0.0
Purchases	0.0	0.0
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, Derivatives, ending balance	(253.0)	(41.0)
Change In Unrealized Gains (Losses) Included in Earnings	0.0	0.0
U.S. corporate public securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	74.0	34.0
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	0.0	0.0
Issuances	0.0	0.0
Sales	0.0	0.0
Settlements	(3.0)	0.0
Transfers in to Level 3	0.0	38.0
Transfers out of Level 3	(5.0)	0.0
Fair Value, Assets, ending balance	66.0	73.0
Change In Unrealized Gains (Losses) Included in Earnings	0.0	0.0
Change In Unrealized Gains (Losses) Included in OCI	0.0
U.S. corporate private securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	1,457.0	1,134.0
Total Realized/Unrealized Gains (Losses) Included in Net income	1.0	0.0
Total Realized/Unrealized Gains (Losses) Included in OCI	(74.0)	43.0
Purchases	46.0	129.0
Issuances	0.0	0.0
Sales	(3.0)	(13.0)
Settlements	(82.0)	(13.0)
Transfers in to Level 3	0.0	0.0
Transfers out of Level 3	(54.0)	0.0
Fair Value, Assets, ending balance	1,291.0	1,280.0
Change In Unrealized Gains (Losses) Included in Earnings	0.0	0.0
Change In Unrealized Gains (Losses) Included in OCI	(74.0)
Foreign corporate public securities and foreign governments
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	0.0	0.0
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	4.0	0.0
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	4.0	0.0
Change In Unrealized Gains (Losses) Included in Earnings	0.0	0.0
Change In Unrealized Gains (Losses) Included in OCI	0.0
Foreign corporate private securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	328.0	217.0
Total Realized/Unrealized Gains (Losses) Included in Net income	(3.0)	(25.0)
Total Realized/Unrealized Gains (Losses) Included in OCI	(51.0)	34.0
Purchases	3.0	72.0
Issuances	0.0	0.0
Sales	(4.0)	(80.0)
Settlements	0.0	0.0
Transfers in to Level 3	10.0	0.0
Transfers out of Level 3	(6.0)	0.0
Fair Value, Assets, ending balance	277.0	218.0
Change In Unrealized Gains (Losses) Included in Earnings	0.0	0.0
Change In Unrealized Gains (Losses) Included in OCI	(51.0)
Residential mortgage-backed securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	23.0	28.0
Total Realized/Unrealized Gains (Losses) Included in Net income	(2.0)	(2.0)
Total Realized/Unrealized Gains (Losses) Included in OCI	0.0	0.0
Purchases	17.0	23.0
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	(8.0)	0.0
Fair Value, Assets, ending balance	30.0	49.0
Change In Unrealized Gains (Losses) Included in Earnings	(2.0)	(2.0)
Change In Unrealized Gains (Losses) Included in OCI	0.0
Commercial mortgage-backed securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance		14.0
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		(1.0)
Transfers in to Level 3		0.0
Transfers out of Level 3		0.0
Fair Value, Assets, ending balance		13.0
Change In Unrealized Gains (Losses) Included in Earnings		0.0
Other asset-backed securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	78.0	127.0
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	10.0	29.0
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	(25.0)
Fair Value, Assets, ending balance	87.0	131.0
Change In Unrealized Gains (Losses) Included in Earnings	0.0	0.0
Change In Unrealized Gains (Losses) Included in OCI	0.0
Fixed maturities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	1,960.0	1,554.0
Total Realized/Unrealized Gains (Losses) Included in Net income	(4.0)	(27.0)
Total Realized/Unrealized Gains (Losses) Included in OCI	(125.0)	79.0
Purchases	80.0	253.0
Issuances	0.0	0.0
Sales	(7.0)	(93.0)
Settlements	(86.0)	(15.0)
Transfers in to Level 3	10.0	38.0
Transfers out of Level 3	(73.0)	(25.0)
Fair Value, Assets, ending balance	1,755.0	1,764.0
Change In Unrealized Gains (Losses) Included in Earnings	(2.0)	(2.0)
Change In Unrealized Gains (Losses) Included in OCI	(125.0)
Equity securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	128.0	104.0
Total Realized/Unrealized Gains (Losses) Included in Net income	(9.0)	4.0
Total Realized/Unrealized Gains (Losses) Included in OCI	0.0	0.0
Purchases	0.0	42.0
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	119.0	150.0
Change In Unrealized Gains (Losses) Included in Earnings	(9.0)	4.0
Change In Unrealized Gains (Losses) Included in OCI	0.0
Discontinued Operations, Held-for-sale \| Other derivatives, net
Derivatives Rollforward:
Fair Value, Derivatives, beginning balance	202.0	83.0
Total Realized/Unrealized Gains (Losses) Included in Net income	(127.0)	52.0
Total Realized/Unrealized Gains (Losses) Included in OCI	0.0	0.0
Purchases	14.0	11.0
Issuances	0.0	0.0
Sales	0.0	0.0
Settlements	(6.0)	(9.0)
Transfers in to Level 3	0.0	0.0
Transfers out of Level 3	0.0	0.0
Fair Value, Derivatives, ending balance	83.0	137.0
Change In Unrealized Gains (Losses) Included in Earnings	(119.0)	54.0
Change In Unrealized Gains (Losses) Included in OCI	0.0
Discontinued Operations, Held-for-sale \| IUL
Derivatives Rollforward:
Fair Value, Derivatives, beginning balance	(217.0)	(82.0)
Total Realized/Unrealized Gains (Losses) Included in Net income	145.0	(63.0)
Total Realized/Unrealized Gains (Losses) Included in OCI	0.0	0.0
Purchases	0.0	0.0
Issuances	(16.0)	(13.0)
Sales	0.0	0.0
Settlements	7.0	12.0
Transfers in to Level 3	0.0	0.0
Transfers out of Level 3	0.0	0.0
Fair Value, Derivatives, ending balance	(81.0)	(146.0)
Change In Unrealized Gains (Losses) Included in Earnings	0.0	0.0
Change In Unrealized Gains (Losses) Included in OCI	0.0
Discontinued Operations, Held-for-sale \| U.S. corporate public securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	32.0	10.0
Total Realized/Unrealized Gains (Losses) Included in Net income	0.0	0.0
Total Realized/Unrealized Gains (Losses) Included in OCI	2.0	1.0
Purchases	1.0	3.0
Issuances	0.0	0.0
Sales	0.0	0.0
Settlements	(1.0)	0.0
Transfers in to Level 3	0.0	21.0
Transfers out of Level 3	0.0	0.0
Fair Value, Assets, ending balance	34.0	35.0
Change In Unrealized Gains (Losses) Included in Earnings	0.0
Change In Unrealized Gains (Losses) Included in OCI	2.0
Discontinued Operations, Held-for-sale \| U.S. corporate private securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	316.0	259.0
Total Realized/Unrealized Gains (Losses) Included in Net income	0.0	0.0
Total Realized/Unrealized Gains (Losses) Included in OCI	(17.0)	11.0
Purchases	9.0	19.0
Issuances	0.0	0.0
Sales	0.0	0.0
Settlements	(10.0)	4.0
Transfers in to Level 3	0.0	0.0
Transfers out of Level 3	(10.0)	0.0
Fair Value, Assets, ending balance	288.0	285.0
Change In Unrealized Gains (Losses) Included in Earnings	0.0
Change In Unrealized Gains (Losses) Included in OCI	(17.0)
Discontinued Operations, Held-for-sale \| Foreign corporate public securities and foreign governments
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	7.0	11.0
Total Realized/Unrealized Gains (Losses) Included in Net income	0.0	0.0
Total Realized/Unrealized Gains (Losses) Included in OCI	(4.0)	(2.0)
Purchases	0.0	0.0
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	3.0	9.0
Change In Unrealized Gains (Losses) Included in Earnings	0.0
Change In Unrealized Gains (Losses) Included in OCI	(4.0)
Discontinued Operations, Held-for-sale \| Foreign corporate private securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	80.0	34.0
Total Realized/Unrealized Gains (Losses) Included in Net income	0.0	(4.0)
Total Realized/Unrealized Gains (Losses) Included in OCI	(13.0)	6.0
Purchases	1.0	25.0
Issuances	0.0	0.0
Sales	0.0	13.0
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	68.0	48.0
Change In Unrealized Gains (Losses) Included in Earnings	0.0
Change In Unrealized Gains (Losses) Included in OCI	(13.0)
Discontinued Operations, Held-for-sale \| Residential mortgage-backed securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	0.0	0.0
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	0.0	0.0
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	0.0	0.0
Change In Unrealized Gains (Losses) Included in Earnings	0.0
Change In Unrealized Gains (Losses) Included in OCI	0.0
Discontinued Operations, Held-for-sale \| Commercial mortgage-backed securities
Fixed Maturities and Equity Securities Rollforward:
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		3.0
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		3.0
Change In Unrealized Gains (Losses) Included in Earnings	0.0
Discontinued Operations, Held-for-sale \| Other asset-backed securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	6.0	11.0
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
Issuances	0.0	0.0
Sales	0.0	0.0
Settlements	(1.0)	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	7.0	13.0
Change In Unrealized Gains (Losses) Included in Earnings	0.0
Change In Unrealized Gains (Losses) Included in OCI	0.0
Discontinued Operations, Held-for-sale \| Fixed maturities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	441.0	325.0
Total Realized/Unrealized Gains (Losses) Included in Net income	0.0	(4.0)
Total Realized/Unrealized Gains (Losses) Included in OCI	(32.0)	16.0
Purchases	13.0	52.0
Issuances	0.0	0.0
Sales	0.0	13.0
Settlements	(12.0)	4.0
Transfers in to Level 3	0.0	21.0
Transfers out of Level 3	(10.0)	0.0
Fair Value, Assets, ending balance	400.0	393.0
Change In Unrealized Gains (Losses) Included in Earnings	0.0
Change In Unrealized Gains (Losses) Included in OCI	(32.0)
Discontinued Operations, Held-for-sale \| Equity securities
Fixed Maturities and Equity Securities Rollforward:
Fair Value, Assets, beginning balance	33.0	25.0
Total Realized/Unrealized Gains (Losses) Included in Net income	(3.0)	2.0
Total Realized/Unrealized Gains (Losses) Included in OCI	0.0	0.0
Purchases	0.0	7.0
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	30.0	34.0
Change In Unrealized Gains (Losses) Included in Earnings	(3.0)	$ 2.0
Change In Unrealized Gains (Losses) Included in 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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- Definition

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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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