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Income Taxes - Provision for Federal & Foreign Income Tax Expense (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current |  |  |
Operations | $ 975 | $ (189) | $ 1,327
One-time charge due to tax legislation | (6) | 43 | 0
Deferred |  |  |
Operations | (194) | 1,607 | (261)
One-time charge due to tax legislation | (37) | 1,843 | 0
Total federal income tax expense | 738 | 3,304 | 1,066
Foreign income tax expense (benefit): |  |  |
Current | 67 | 53 | 56
Deferred | (13) | (1) | (29)
Total foreign income tax expense | 54 | 52 | 27
Total income tax expense | $ 792 | $ 3,356 | $ 1,093

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