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Income Taxes - Provision for Federal & Foreign Income Tax Expense (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current |  |  |
Operations | $ (189) | $ 1,327 | $ 1,573
One-time charge due to tax legislation | 43 | 0 | 0
Deferred |  |  |
Operations | 1,613 | (231) | (473)
One-time charge due to tax legislation | 1,819 | 0 | 0
Total federal income tax expense | 3,286 | 1,096 | 1,100
Foreign income tax expense (benefit): |  |  |
Current | 53 | 56 | 39
Deferred | 1 | (19) | 34
Total foreign income tax expense | 54 | 37 | 73
Total income tax expense | $ 3,340 | $ 1,133 | $ 1,173

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