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Stockholders' Equity And Benefit Plans (Narrative) (Details) (USD $)
Share data in Millions, unless otherwise specified
 3 Months Ended 20 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2012
Mar. 31, 2012
Mar. 31, 2012
Period Authorized Fiscal Year 2010 Termination Date December 2013 [Member]
Dec. 31, 2011
Period Authorized Fiscal Year 2010 Termination Date December 2013 [Member]
Common stock repurchased, value   $ 509,400,000 $ 59,300,000 $ 270,900,000
Common stock repurchased and retired during period, shares 6.8      
Common stock authorized amount, value     750,000,000  
Common stock decreased by effective retirement of common stock repurchased 68,000      
Additional paid in capital decreased by effective retirement of common stock repurchased 28,500,000      
Retained earnings decreased by effective retirement of common stock repurchased 481,400,000      
Treasury stock decreased by effective retirement of common stock repurchased $ 510,000,000