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Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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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 | $ (9) | $ (44)
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 | 19,584 | 18,958
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 | 13,956 | 13,240
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 | 5,005 | 5,073
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 | 1,900 | 2,040
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 | 1,061 | 1,025
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 | 7,966 | 8,138
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 | 115 | 93
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 | 445 | 445
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 | 19
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 | 42,086 | 40,893
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 | 421 | 601
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 | 42,507 | 41,494
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 | 129 | 110
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 | 481 | 439
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 | 610 | 549
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 | 66 | 60
Receivables [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis |  | 1
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 |  | 58
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 | 4,895 | 4,686
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 | (9) | (44)
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 | 115 | 93
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 | 19
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 | 135 | 112
Level 1 [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 | 9 |
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 | 144 | 112
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 | 110 | 91
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 | 479 | 438
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 | 589 | 529
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 | 61 | 55
Level 1 [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 |  | 1
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 | 4,019 | 3,833
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 | 19,465 | 18,828
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 | 13,955 | 13,239
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 | 4,829 | 4,944
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 | 1,876 | 2,027
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 | 915 | 968
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 | 7,620 | 7,939
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 | 445 | 445
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 | 41,485 | 40,451
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 | 407 | 595
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 | 41,892 | 41,046
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 | 5
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 | 876 | 853
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 | 119 | 130
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 | 1
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 | 176 | 129
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 | 13
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 | 146 | 57
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 | 346 | 199
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 | 466 | 330
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 | 5 | 6
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 | 471 | 336
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 | 19
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 | 2 | 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 | $ 21 | 20
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 |  | $ 58

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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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