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Provision for Federal & Foreign Income Tax Expense (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Federal income tax expense (benefit): |  |  |
Current | $ 1,327 | $ 1,573 | $ 1,770
Deferred | (231) | (473) | (351)
Total federal income tax expense | 1,096 | 1,100 | 1,419
Foreign income tax expense (benefit): |  |  |
Current | 56 | 39 | 13
Deferred | (19) | 34 | (8)
Total foreign income tax expense | 37 | 73 | 5
Total income tax expense | $ 1,133 | $ 1,173 | $ 1,424

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