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Income Taxes - Provision for Federal & Foreign Income Tax Expense (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Current |  |  |
Operations | $ 698 | $ 975 | $ (189)
One-time charge due to tax legislation | 0 | (6) | 43
Deferred |  |  |
Operations | 235 | (194) | 1,607
One-time charge due to tax legislation | 0 | (37) | 1,843
Total federal income tax expense | 933 | 738 | 3,304
Foreign income tax expense (benefit): |  |  |
Current | 91 | 67 | 53
Deferred | (13) | (13) | (1)
Total foreign income tax expense | 78 | 54 | 52
Total income tax expense | $ 1,011 | $ 792 | $ 3,356

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