Other (Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended				3 Months Ended							9 Months Ended
	Oct. 31, 2011	Sep. 25, 2011	Aug. 31, 2011	Jan. 31, 2011	Dec. 31, 2011	Sep. 25, 2011	Jun. 26, 2011	Mar. 27, 2011	Sep. 26, 2010	Jun. 27, 2010	Mar. 28, 2010	Sep. 25, 2011	Sep. 26, 2010	Sep. 27, 2011	Sep. 09, 2011	Dec. 31, 2010
Debt instrument, face amount		$ 7,545,000,000				$ 7,545,000,000						$ 7,545,000,000			$ 2,000,000,000	$ 5,524,000,000
Premium that will be recognized in other non-operating income (expense), net	26,000,000
Additional amount to increase credit facility, at banks' discretion			500,000,000
Repurchases of common stock, shares												29.9	19.8
Additional authorized amount under stock repurchase program		2,500,000,000	1,000,000,000
Total authorized amount under stock repurchase program												6,500,000,000
Number of shares repurchased in current period but settled and paid for in subsequent period	0.1
Value of shares repurchased in current period but settled and paid for in subsequent period	9,000,000
Cash paid for repurchases of common stock												2,317,000,000	1,566,000,000
Repurchases of common stock												2,263,000,000	1,566,000,000
Value of shares repurchased in prior period but paid for in current period				63,000,000
Number of shares repurchased under the share repurchase program		41.1				41.1						41.1
Value of stock repurchased under share repurchase program						3,038,000,000
Remaining authorized repurchase amount						3,462,000,000
Common stock par value, per share (in USD)		$ 1				$ 1						$ 1				$ 1
Total options granted, shares				2.5
Exercise price, per share (in USD)				$ 79.60
Fair value of option on the date of grant, per share (in USD)				$ 13.06
Number of years over which stock options vest				three
Common stock dividends												770,000,000	700,000,000
Dividends payable		323,000,000				323,000,000						323,000,000
Common stock dividends declared, per share (in USD)					$ 1.00
Dividend paid, per share (in USD)						$ 0.75	$ 0.75	$ 0.75	$ 0.63	$ 0.63	$ 0.63	$ 2.25	$ 1.89
Adjustment for postretirement benefit plans, net of tax						171,000,000			116,000,000			501,000,000	347,000,000
Federal and foreign income tax payments made, net of refunds received												562,000,000	326,000,000
Refund received from the IRS related to estimated taxes paid for the prior year												250,000,000	325,000,000
Increase in operating profit, net of state taxes, due to changes in estimates						425,000,000			325,000,000			1,175,000,000	975,000,000
Increase in net earnings due to changes in estimates						275,000,000			200,000,000			775,000,000	625,000,000
Increase in diluted earnings per share due to changes in estimates, per share (in USD)						$ 0.80			$ 0.55			$ 2.25	$ 1.70
Cash paid for acquisition														420,000,000
Restricted Stock Units (RSUs) [Member]
Number of years over which stock options vest				three
Number of RSUs granted, shares				1.9
RSUs fair value, per share (in USD)				$ 79.43
2.13% Fixed Coupon Interest Rate Due In 2016 [Member]
Debt instrument, face amount															500,000,000
Long-term note, interest rate															2.13%
3.35% Fixed Coupon Interest Rate Due In 2021 [Member]
Debt instrument, face amount															900,000,000
Long-term note, interest rate															3.35%
4.85% Fixed Coupon Interest Rate Due In 2041 [Member]
Debt instrument, face amount															600,000,000
Long-term note, interest rate															4.85%
4.12% Fixed Coupon Interest Rate Due In 2013 [Member]
Debt instrument, face amount		500,000,000				500,000,000						500,000,000
Long-term note, interest rate		4.12%				4.12%						4.12%
Credit Facility Expiring In June 2012 [Member]
Revolving credit facility			1,500,000,000
Credit Facility Expiring In August 2016 [Member]
Revolving credit facility			$ 1,500,000,000