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
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation Of Income Taxes [Line Items]
Income tax expense at the U.S. federal statutory tax rate	$ 1,710	$ 1,505	$ 1,637
Adoption of stock-based compensation ASU	(152)
U.S. manufacturing deduction benefit	(117)	(123)	(124)
Research and development tax credit	(107)	(70)	(63)
Tax deductible dividends	(92)	(87)	(82)
Other, net	(109)	(52)	56
Total income tax expense	$ 1,133	$ 1,173	$ 1,424
Income tax expense at the U.S. federal statutory tax rate	35.00%	35.00%	35.00%
Adoption of stock-based compensation ASU, rate	(3.10%)
U.S. manufacturing deduction benefit, rate	(2.40%)	(2.90%)	(2.60%)
Research and development tax credit, rate	(2.20%)	(1.60%)	(1.30%)
Tax deductible dividends, rate	(1.90%)	(2.00%)	(1.80%)
Other, net, rate	(2.20%)	(1.20%)	1.10%
Total Income tax expense, rate	23.20%	27.30%	30.40%