Insurance Subsidiaries - Captive Reinsurance Subsidiaries (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Missouri
Statutory Accounting Practices [Line Items]
Prescribed practice amount	$ 623	$ 577
Aggregate statutory capital and surplus, including prescribed practices	398	352
Arizona \| Security Life of Denver International Ltd
Statutory Accounting Practices [Line Items]
Permitted practice amount	451	441
Arizona \| VOYA Financial, Inc. / Roaring River II LLC
Statutory Accounting Practices [Line Items]
Permitted practice amount	$ 2,761	$ 2,467

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

Amount of each item listed to reconcile the differences as of the balance sheet date resulting from applying state permitted statutory accounting practices rather than statutory accounting practices permitted by National Association of Insurance Commissioners.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24746-158529

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Amount as of the balance sheet date of each item listed to reconcile the differences resulting from applying state prescribed statutory accounting practices rather than statutory accounting practices prescribed by National Association of Insurance Commissioners.

+ References

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- Definition

Amount of statutory capital and surplus computed using statutory accounting practices prescribed by the National Association of Insurance Commissioners.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529

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