Shareholders' Equity (Shareholders' Equity, Accumulated Other Comprehensive Loss, Common Stock, and Preferred Stock) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Class of Stock [Line Items]
Issued	1,073,000,000		1,073,000,000		1,069,000,000
In treasury	(144,000,000)		(152,000,000)		(159,000,000)
Total shares of common stock outstanding	929,000,000		921,000,000		910,000,000
Defined benefit and other postretirement liability adjustments	$ (241,000,000)	[1]	$ (208,000,000)	[1]	$ (175,000,000)	[1]
Cumulative translation adjustment	(69,000,000)		(66,000,000)		(66,000,000)
Other	1,000,000		1,000,000		1,000,000
Total accumulated other comprehensive loss	(309,000,000)		(273,000,000)		(240,000,000)
Common Stock, Number of Shares, Par Value and Other 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, Number of Shares, Par Value and Other Disclosures [Abstract]
Number of shares of preferred stock that are authorized for issuance (in shares)	5,000,000
Number of shares preferred stock that are issued at period end (in shares)	0
Foreign Pension Plans, Defined Benefit
Class of Stock [Line Items]
Net actuarial losses	$ 208,000,000		$ 184,000,000		$ 170,000,000

[1] Included net actuarial losses for our international pension plans of $208 million at December 31, 2012, $184 million at December 31, 2011, and $170 million at December 31, 2010.