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Investments - Components of Net Other-than-Temporary Impairment Losses Recognized in Earnings by Asset Type (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Net OTTI losses recognized in earnings | $ 18 | $ 56 | $ 56 | $ 99
Corporate and Other Bonds [Member] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Net OTTI losses recognized in earnings | 14 | 36 | 43 | 52
States, Municipalities and Political Subdivisions [Member] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Net OTTI losses recognized in earnings |  |  |  | 18
Residential Mortgage-Backed [Member] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Net OTTI losses recognized in earnings |  | 1 | 1 | 7
Other Asset-Backed [Member] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Net OTTI losses recognized in earnings |  |  | 3 | 1
Total Asset-Backed [Member] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Net OTTI losses recognized in earnings |  | 1 | 4 | 8
Total Fixed Maturities Available-for-Sale [Member] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Net OTTI losses recognized in earnings | 14 | 37 | 47 | 78
Common Stock [Member] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Net OTTI losses recognized in earnings | $ 4 | $ 19 | $ 9 | 20
Short Term Investments [Member] |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |  |  |
Net OTTI losses recognized in earnings |  |  |  | $ 1

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- Definition 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. + References No definition available. + Details
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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=73527792&loc=SL6284393-111563 + Details
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