Shareholders' Equity and Stock Incentive Plans, Accumulated Other Comprehensive Loss, Common Stock, and Preferred Stock (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of accumulated other comprehensive income (loss) [Abstract]
Cumulative translation adjustment	$ (66,000,000)	$ (66,000,000)	$ (65,000,000)
Defined benefit and other postretirement liability adjustments	(208,000,000)	(175,000,000)	(149,000,000)
Unrealized gains on investments	1,000,000	1,000,000	1,000,000
Total accumulated other comprehensive loss	(273,000,000)	(240,000,000)	(213,000,000)
Class of Stock [Line Items]
Issued (in shares)	1,073	1,069	1,067
In treasury (in shares)	(152)	(159)	(165)
Total shares of common stock outstanding (in shares)	921	910	902
Common stock disclosures [Abstract]
Stock authorized to repurchase	5,000,000,000
Stock remaining available for repurchase at period end	1,700,000,000
Number of shares of common stock repurchased from inception (in shares)	96,000,000
Approximate value of shares of common stock repurchased from inception	3,300,000,000
Average price per share of common stock that has been repurchased from inception (in dollars per share)	$ 34.22
Repurchase of shares during the period (in shares)	0
Preferred stock [Abstract]
Number of shares of preferred stock that are authorized for issuance (in shares)	5,000,000
Number of shares of preferred stock that are issued at period end (in shares)	0
International [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial losses	$ 184,000,000	$ 170,000,000	$ 149,000,000