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Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
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Payable to Brokers [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of liabilities, measured on a recurring basis | $ (215) | $ (196)
Corporate and Other Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 19,816 | 17,769
States, Municipalities and Political Subdivisions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 13,501 | 13,174
Residential Mortgage-Backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 5,365 | 5,072
Commercial Mortgage-Backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 2,144 | 2,197
Other Asset-Backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 959 | 921
Total Asset-Backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 8,468 | 8,190
U.S. Treasury and Obligations of Government-Sponsored Enterprises [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 76 | 67
Foreign Government [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 438 | 346
Redeemable Preferred Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 20 | 35
Total Fixed Maturities Available-for-Sale [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 42,319 | 39,581
Fixed Maturities Trading [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 575 | 120
Fixed Maturity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 42,894 | 39,701
Equity Securities Available-for-Sale [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 116 | 197
Equity Securities Trading [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 470 | 555
Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 586 | 752
Other Invested Assets [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 59 | 146
Receivables [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis |  | 12
Life Settlement Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 67 | 74
Short Term Investments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 4,813 | 4,734
Level 1 [Member] | Payable to Brokers [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of liabilities, measured on a recurring basis | (215) | (196)
Level 1 [Member] | U.S. Treasury and Obligations of Government-Sponsored Enterprises [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 76 | 66
Level 1 [Member] | Redeemable Preferred Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 20 | 35
Level 1 [Member] | Total Fixed Maturities Available-for-Sale [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 96 | 101
Level 1 [Member] | Fixed Maturity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 96 | 101
Level 1 [Member] | Equity Securities Available-for-Sale [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 97 | 177
Level 1 [Member] | Equity Securities Trading [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 469 | 554
Level 1 [Member] | Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 566 | 731
Level 1 [Member] | Other Invested Assets [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 54 | 102
Level 1 [Member] | Short Term Investments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 3,902 | 3,600
Level 2 [Member] | Corporate and Other Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 19,555 | 17,601
Level 2 [Member] | States, Municipalities and Political Subdivisions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 13,500 | 13,172
Level 2 [Member] | Residential Mortgage-Backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 5,286 | 4,938
Level 2 [Member] | Commercial Mortgage-Backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 2,120 | 2,175
Level 2 [Member] | Other Asset-Backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 916 | 868
Level 2 [Member] | Total Asset-Backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 8,322 | 7,981
Level 2 [Member] | U.S. Treasury and Obligations of Government-Sponsored Enterprises [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis |  | 1
Level 2 [Member] | Foreign Government [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 438 | 346
Level 2 [Member] | Total Fixed Maturities Available-for-Sale [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 41,815 | 39,101
Level 2 [Member] | Fixed Maturities Trading [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 569 | 35
Level 2 [Member] | Fixed Maturity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 42,384 | 39,136
Level 2 [Member] | Other Invested Assets [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 5 | 44
Level 2 [Member] | Receivables [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis |  | 9
Level 2 [Member] | Short Term Investments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 911 | 1,134
Level 3 [Member] | Corporate and Other Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 261 | 168
Level 3 [Member] | States, Municipalities and Political Subdivisions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 1 | 2
Level 3 [Member] | Residential Mortgage-Backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 79 | 134
Level 3 [Member] | Commercial Mortgage-Backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 24 | 22
Level 3 [Member] | Other Asset-Backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 43 | 53
Level 3 [Member] | Total Asset-Backed [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 146 | 209
Level 3 [Member] | Total Fixed Maturities Available-for-Sale [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 408 | 379
Level 3 [Member] | Fixed Maturities Trading [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 6 | 85
Level 3 [Member] | Fixed Maturity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 414 | 464
Level 3 [Member] | Equity Securities Available-for-Sale [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 19 | 20
Level 3 [Member] | Equity Securities Trading [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 1 | 1
Level 3 [Member] | Equity Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 20 | 21
Level 3 [Member] | Receivables [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis |  | 3
Level 3 [Member] | Life Settlement Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | $ 67 | $ 74

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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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