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Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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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 | $ (123) | $ (23)
Corporate Bonds and Other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 22,120 | 19,810
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 | 10,703 | 10,748
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 | 8,816 | 8,984
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 | 41,639 | 39,542
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 | 24 | 157
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 | 41,663 | 39,699
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 | 1,367 | 1,293
Receivables [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis |  | 11
Short Term and Other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 4,592 | 3,758
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 | (114) | (23)
Level 1 [Member] | Corporate Bonds and Other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 152 | 196
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 | 152 | 196
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 | 152 | 196
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 | 715 | 704
Level 1 [Member] | Short Term and Other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 3,469 | 2,647
Level 2 [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) |
Level 2 [Member] | Corporate Bonds and Other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 21,630 | 19,392
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 | 10,703 | 10,748
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 | 8,623 | 8,787
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 | 40,956 | 38,927
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 | 20 | 151
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 | 40,976 | 39,078
Level 2 [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 | 629 | 570
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 |  | 11
Level 2 [Member] | Short Term and Other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 1,123 | 1,111
Level 3 [Member] | Corporate Bonds and Other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets, measured on a recurring basis | 338 | 222
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 | 193 | 197
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 | 531 | 419
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 | 4 | 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 | 535 | 425
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 | $ 23 | $ 19

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