Stock and Incentive Programs for Employees (Narrative) (Details) (USD $)	12 Months Ended																					1 Months Ended	0 Months Ended	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Restricted Stock [Member] years	Dec. 31, 2010 Restricted Stock [Member]	Dec. 31, 2009 Restricted Stock [Member]	Dec. 31, 2011 Performance Incentive Plan [Member] years	Dec. 31, 2011 Stock Options [Member] years	Dec. 31, 2010 Stock Options [Member]	Dec. 31, 2009 Stock Options [Member]	Dec. 31, 2011 Performance Share Unit Awards [Member] years	Dec. 31, 2010 Performance Share Unit Awards [Member]	Dec. 31, 2009 Performance Share Unit Awards [Member]	Dec. 31, 2011 Prior To November 2004 And After December 2006 [Member] Stock Options [Member] years	Dec. 31, 2011 Between November 2004 And December 2006 [Member] Stock Options [Member] years	Dec. 31, 2011 After Retirement Date [Member] Stock Options [Member] years	Dec. 31, 2011 Between January 2008 And January 2009 [Member]	Dec. 31, 2011 Director [Member] Restricted Stock [Member]	Dec. 31, 2010 Director [Member] Restricted Stock [Member]	Dec. 31, 2009 Director [Member] Restricted Stock [Member]	Dec. 31, 2011 Director [Member] Between January 2008 And January 2009 [Member] Restricted Stock [Member]	Nov. 17, 2011 Accelerated Share Repurchase Program [Member]	May 10, 2011 Accelerated Share Repurchase Program [Member]	Dec. 31, 2011 Accelerated Share Repurchase Program [Member]	Dec. 31, 2011 Share Repurchase Program [Member]	Dec. 31, 2009 Two Thousand And Eight Share Repurchase Program [Member]	Dec. 31, 2011 Two Thousand And Eight Share Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting term, minimum (in years)	three
Award vesting term (in years)											three						three				three
Award vesting term, maximum (in years)	four			four				four
Share-based compensation expense	$ 28,300,000	$ 28,600,000	$ 24,000,000	$ 24,400,000	$ 25,500,000	$ 21,600,000		$ 2,700,000	$ 3,100,000	$ 2,400,000	$ 1,200,000	$ 0	$ 0					$ 100,000	$ 400,000	$ 900,000
Share-based compensation expense, income tax benefit	11,000,000	11,200,000	9,600,000
Unrecognized share-based compensation cost	31,200,000			25,900,000				2,900,000			2,400,000
Unrecognized compensation expense, weighted-average period of recognition, in years	2.2							2.1			2.0
Common stock reserved and authorized (in shares)							17,000,000
Maximum award term (in years)							10							10	5	5
Shares authorized and available for grant under the 2004 PIP							2,300,000
Restricted awards vesting percentage at fourth anniversary				100.00%
Stock options granted	200,000	540,000	1,520,468
Equity instruments other than options, outstanding shares				4,989,000	5,430,000													147,263	145,459	158,633
Amount payable as a percentage of initial award, contingent upon maximum performance	100.00%
Granted, shares				1,524,000								0	0													0
Grant date fair value of options	$ 4.39	$ 4.81	$ 1.47
Intrinsic value of options exercised	1,000,000	3,000,000
Cash received from the option exercises								1,000,000	2,400,000	1,500,000
Grant date fair market value of the awards granted				$ 16.37							$ 15.54
Tax benefit realized for tax deduction from option exercises								400,000	1,100,000	100,000
Excess tax benefits shown as financing cash inflows				5,700,000	6,000,000	0		300,000	800,000	0
Equity instruments other than options expected to vest, shares				4,600,000
Equity instruments other than options expected to vest, weighted-average grant date fair value				$ 13.80
Equity instruments other than options expected to vest, weighted-average period of recognition (in years)				1.7
Equity instruments other than options, minimum expected grants in period											117,500
Equity instruments other than options, maximum expected grants in period											235,000
Treasury stock, shares acquired		0	0																			9,300,000	19,900,000	29,200,000
Cash payment for share repurchase under ASR program																								500,000,000
Stock repurchase program, authorized amount																								$ 500,000,000	$ 1,000,000,000
Stock repurchase program, shares authorized																											10,000,000