Income Taxes - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 26, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]
Total net state income tax expense		$ 183	$ 149	$ 168
U.S. federal statutory income tax rate		35.00%
Deduction rate related to U.S. manufacturing activity		9.00%	9.00%	9.00%
Recognized tax benefit for the impact of the tax credit			35	43
Reduction in income tax expense due to IRS examinations	(89)		(89)	(10)
Reduction in tax expense per share from resolution of tax matters			$ 0.26
Increase in tax expense related to Medicare Part D reimbursement				96
Decrease in diluted earnings per share, in USD, due to write off of deferred tax assets associated with retiree prescription drug expenses				$ 0.26
Liabilities for unrecognized tax benefits related to permanent and temporary tax adjustments, exclusive of interest			160
Undistributed foreign companies, earnings not taxed to U.S. income taxes and foreign withholding taxes		211	193	108
Estimated additional income tax expense after foreign tax credits on undistributed earnings of foreign companies if remitted		45	41	17
Federal and foreign income tax payments, net of refunds received		890	722	806
Refund received from the IRS related to capital loss carryback claim and estimated taxes paid for the prior year		153	250	325
Tax payment related to sale of EIG				260
Advance payment related to matters pending with IRS Appeals				85
Federal and foreign taxes receivable		$ 662