Consolidated Statements of Stockholders' Equity (USD $) In Millions, except Share data, unless otherwise specified	Total	Common Stock	Capital in Excess of Par Value	Common Stock in Treasury	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)
Beginning balance at Dec. 31, 2009	$ 1,686	$ 202	$ 153	$ (1,983)	$ 3,230	$ 84
Beginning balance (in shares) at Dec. 31, 2009		202,000,000		80,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	384				384
Other comprehensive income	11					11
Cash dividends	(78)				(78)
Exercise of stock options	60		30	30
Exercise of stock options (in shares)		0		(2,000,000)
Restricted stock unit grant	5		4	1
Stock-based compensation expense	7		7	0
Stock repurchases	(99)		0	(99)
Stock repurchases (in shares)		0		2,000,000
Ending balance at Dec. 31, 2010	1,976	202	194	(2,051)	3,536	95
Ending balance (in shares) at Dec. 31, 2010		202,000,000		80,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	457				457
Other comprehensive income	(65)					(65)
Cash dividends	(86)				(86)
Exercise of stock options	37		21	16
Exercise of stock options (in shares)		0		(1,000,000)
Restricted stock unit grant	7		3	4
Stock-based compensation expense	7		7	0
Stock repurchases	(134)		0	(134)
Stock repurchases (in shares)	98,000,000	0		2,000,000
Ending balance at Dec. 31, 2011	2,199	202	225	(2,165)	3,907	30
Ending balance (in shares) at Dec. 31, 2011		202,000,000		81,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	460				460
Other comprehensive income	39					39
Cash dividends	(97)				(97)
Exercise of stock options	54		36	18
Exercise of stock options (in shares)	(1,319,322)	0		(1,000,000)
Restricted stock unit grant	6		6	0
Stock-based compensation expense	9		9	0
Stock repurchases	(124)		0	(124)
Stock repurchases (in shares)	99,000,000	0		2,000,000
Ending balance at Dec. 31, 2012	$ 2,546	$ 202	$ 276	$ (2,271)	$ 4,270	$ 69
Ending balance (in shares) at Dec. 31, 2012		202,000,000		82,000,000