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Income Taxes - Reconciliation of Income Tax Expense Computed Using U.S. Statutory Federal Tax Rate to Actual Income Tax Expense (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Amount |  |  |
Income tax expense at the U.S. federal statutory tax rate | $ 1,844 | $ 1,710 | $ 1,505
One-time charge due to tax legislation | 1,862 | 0 | 0
Excess tax benefits for share-based payment awards | (106) | (152) | 0
U.S. manufacturing deduction benefit (b) | (7) | (117) | (123)
Research and development tax credit | (115) | (107) | (70)
Tax deductible dividends | (94) | (92) | (87)
Other, net | (44) | (109) | (52)
Total income tax expense | $ 3,340 | $ 1,133 | $ 1,173
Rate |  |  |
Income tax expense at the U.S. federal statutory tax rate | 35.00% | 35.00% | 35.00%
Deferred tax write down and transition tax (a) | 35.30% | 0.00% | 0.00%
Excess tax benefits for share-based payment awards | (2.00%) | (3.10%) | 0.00%
U.S. manufacturing deduction benefit (b) | (0.10%) | (2.40%) | (2.90%)
Research and development tax credit | (2.20%) | (2.20%) | (1.60%)
Tax deductible dividends | (1.80%) | (1.90%) | (2.00%)
Other, net | (0.80%) | (2.20%) | (1.20%)
Income tax expense | 63.40% | 23.20% | 27.30%

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