Capital Stock and Earnings per Share (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Reconciliation of weighted average shares for the basic and diluted shares computations
Weighted average shares outstanding for basic net earnings per share	187.6	200.0	215.0
Effect of dilutive stock options and other equity awards	1.1	1.1	0.8
Weighted average shares outstanding for diluted net earnings per share	188.7	201.1	215.8
Capital Stock and Earnings per Share (Numeric)
Preferred Stock, Shares authorized	250
Preferred Stock, Shares issued	0
Preferred Stock, Shares outstanding	0
Options to purchase shares of common stock not included in the computation of diluted earnings per share	13.2	13.7	14.3
Repurchased shares of common stock	18.9
Average price per share	$ 55.54
Total cash outlay	$ 1,050,000,000	$ 505,600,000	$ 923,700,000
Amount remains authorized for future repurchases	1,500,000,000
Amount authorized for share repurchase program	1,500,000,000
Dividend declared	$ 0.18
Dividend payable	$ 32,100,000