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Business Developments And Risks And Uncertainties (Assets And Liabilities Held For Sale) (Detail) $ in Millions | Dec. 31, 2016 USD ($)
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Assets And Liabilities Held For Sale By Major Category [Line Items] |
Assets held for sale | $ 555
Liabilities held for sale | 346
Investments At Fair Value [Member] |
Assets And Liabilities Held For Sale By Major Category [Line Items] |
Assets held for sale | 466
Cash And Cash Equivalents [Member] |
Assets And Liabilities Held For Sale By Major Category [Line Items] |
Assets held for sale | 73
Premiums Receivable [Member] |
Assets And Liabilities Held For Sale By Major Category [Line Items] |
Assets held for sale | 267
Other Assets [Member] |
Assets And Liabilities Held For Sale By Major Category [Line Items] |
Assets held for sale | 19
Valuation Allowance [Member] |
Assets And Liabilities Held For Sale By Major Category [Line Items] |
Assets held for sale | (270)
Unearned Premium Revenue [Member] |
Assets And Liabilities Held For Sale By Major Category [Line Items] |
Liabilities held for sale | 304
Other Liabilities [Member] |
Assets And Liabilities Held For Sale By Major Category [Line Items] |
Liabilities held for sale | $ 42

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