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Income Taxes (Income Taxes and Shareholders' Equity) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Current taxes: |  |  |
Federal | $ 0 | $ 0 | $ 0
State | 1 | 10 | 8
Foreign | 2 | 12 | 1
Deferred taxes: |  |  |
Federal | 97 | 48 | 165
Foreign | 9 | 2 | (8)
Provision (benefit) for income taxes | 109 | 72 | 166
Income tax effects allocated directly to equity [Abstract] |  |  |
Change in unrealized gains and losses on AFS securities | (30) | 89 | (81)
Change in AFS securities with OTTI | 0 | (29) | 4
Change in foreign currency translation | (14) | (13) | 1
Share-based compensation | 9 | 2 | 4
Total income taxes charged (credited) to shareholders' equity | (35) | 49 | (72)
Total effect of income taxes | $ 74 | $ 121 | $ 94

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