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Income Taxes (Income Taxes and Shareholders' Equity) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current taxes: |  |  |
Federal | $ 0 | $ 4 | $ 4
State | 1 | 0 | 1
Deferred taxes: |  |  |
Federal | (1) | 945 | (8)
Foreign | 0 | (5) | 2
Provision (benefit) for income taxes | 0 | 944 | (1)
Income tax effects allocated directly to equity [Abstract] |  |  |
Change in unrealized gains and losses on AFS securities | 5 | (1) | 8
Change in AFS securities with OTTI | 0 | 1 | 5
Change in foreign currency translation | 0 | 21 | 1
Total income taxes charged (credited) to shareholders' equity | 5 | 21 | 14
Total effect of income taxes | $ 5 | $ 965 | $ 13

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