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Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
OTTI Gains (Losses) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Tax on change in other comprehensive income (loss) before reclassifications | $ 0 | $ (4) | $ 0 | $ (5)
Tax on reclassification from accumulated other comprehensive income | 0 | 2 | 1 | 1
Unrealized Gains (Losses) on Investments [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Tax on change in other comprehensive income (loss) before reclassifications | (20) | (32) | (130) | (304)
Tax on reclassification from accumulated other comprehensive income | 4 | 13 | 28 | 12
Cash Flow Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Tax on change in other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Tax on reclassification from accumulated other comprehensive income | 0 | 0 | 0 | 0
Pension Liability [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Tax on change in other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Tax on reclassification from accumulated other comprehensive income | (6) | (4) | (13) | (11)
Foreign Currency Translation [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Tax on change in other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Tax on reclassification from accumulated other comprehensive income | $ 0 | $ 0 | $ 0 | $ 0

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