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Commitments and Contingencies (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Entity Information [Line Items] |  |
Net assets of subsidiaries subject to restrictions | $ 1,777 | $ 1,691
Aggregate statutory capital and surplus | 1,904 |
Required minimum statutory capital surplus | 1,181 |
Parent Company |  |
Entity Information [Line Items] |  |
Cash, cash equivalents, and investments (excluding restricted investments) | $ 706 | $ 696

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- Definition Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)(3)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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