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Income Taxes (Income Taxes and Shareholders' Equity) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Current taxes: |  |  |
Federal | $ 4 | $ 0 | $ 0
State | 1 | 1 | 10
Foreign | 0 | 2 | 12
Deferred taxes: |  |  |
Federal | (8) | 97 | 48
State | 0 | 0 | 0
Foreign | 2 | 9 | 2
Provision (benefit) for income taxes | (1) | 109 | 72
Income tax effects allocated directly to equity [Abstract] |  |  |
Change in unrealized gains and losses on AFS securities | 8 | (30) | 89
Change in AFS securities with OTTI | 5 | 0 | (29)
Change in foreign currency translation | 1 | (14) | (13)
Share-based compensation | 0 | 9 | 2
Total income taxes charged (credited) to shareholders' equity | 14 | (35) | 49
Total effect of income taxes | $ 13 | $ 74 | $ 121

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