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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 ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Amount |  |  |
Income tax expense at the U.S. federal statutory tax rate | $ 1,226,000,000 | $ 1,836,000,000 | $ 1,664,000,000
Research and development tax credit | (138,000,000) | (115,000,000) | (107,000,000)
Foreign derived intangible income deduction | (61,000,000) | 0 | 0
Tax deductible dividends | (59,000,000) | (94,000,000) | (92,000,000)
Excess tax benefits for share-based payment awards | (55,000,000) | (106,000,000) | (152,000,000)
Deferred tax write-down and transition tax | (43,000,000) | 1,886,000,000 | 0
U.S. manufacturing deduction benefit | 0 | (7,000,000) | (117,000,000)
Tax accounting method change | (61,000,000) | 0 | 0
Other, net | (17,000,000) | (44,000,000) | (103,000,000)
Total income tax expense | $ 792,000,000 | $ 3,356,000,000 | $ 1,093,000,000
Rate |  |  |
Income tax expense at the U.S. federal statutory tax rate | 21.00% | 35.00% | 35.00%
Research and development tax credit | (2.40%) | (2.20%) | (2.20%)
Foreign derived intangible income deduction | (1.00%) | (0.00%) | (0.00%)
Tax deductible dividends | (1.00%) | (1.80%) | (1.90%)
Excess tax benefits for share-based payment awards | (0.90%) | (2.00%) | (3.20%)
Deferred tax write-down and transition tax | (0.70%) | 35.90% | 0.00%
U.S. manufacturing deduction benefit | (0.00%) | (0.10%) | (2.50%)
Tax accounting method change, percent | (1.00%) | 0.00% | 0.00%
Other, net | (0.40%) | (0.80%) | (2.20%)
Income tax expense | 13.60% | 64.00% | 23.00%

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