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Investments (Components of other-than-temporary impairment losses recognized in earnings) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
OTTI losses recognized in earnings | $ 14 | $ 81 | $ 156
Corporate and other bonds |  |  |
OTTI losses recognized in earnings | 12 | 59 | 104
States, municipalities and political subdivisions |  |  |
OTTI losses recognized in earnings | 0 | 0 | 18
Residential mortgage-backed |  |  |
OTTI losses recognized in earnings | 1 | 10 | 8
Other asset-backed |  |  |
OTTI losses recognized in earnings | 0 | 3 | 1
Total asset-backed |  |  |
OTTI losses recognized in earnings | 1 | 13 | 9
Total fixed maturity securities available-for-sale |  |  |
OTTI losses recognized in earnings | 13 | 72 | 131
Equity securities available-for-sale |  |  |
OTTI losses recognized in earnings | $ 1 | $ 9 | $ 25

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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -URI http://asc.fasb.org/extlink&oid=82897076&loc=SL6284393-111563 + Details
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