Reconciliation of Income Tax Expense Computed Using U.S. Statutory Federal Tax Rate to Actual Income Tax Expense (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 26, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation Of Income Taxes [Line Items]
Income tax expense at the U.S. federal statutory tax rate		$ 1,425	$ 1,271	$ 1,322
Increase (decrease) in tax expense:
U.S. manufacturing activity benefit		(29)	(106)	(110)
Tax deductible dividends		(73)	(62)	(56)
Research and development tax credit			(35)	(43)
IRS appeals and audit resolution	(89)		(89)	(10)
Medicare Part D law change				96
Other, net		4	(15)	(35)
Income tax expense		$ 1,327	$ 964	$ 1,164