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Stock-Based Compensation Plans (Summary Of Stock Option Activity) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
years
Dec. 31, 2010
years
Dec. 31, 2009
years
Employee Stock Option Plan [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares, Outstanding at Beginning of Year 6,805 8,419 9,392
Shares, Granted 2,462 2,197 1,990
Shares, Exercised (1,497) (3,564) (432)
Shares, Forfeited (215) (247) (2,531)
Shares, Outstanding at End of Year 7,555 6,805 8,419
Shares, Exercisable at End of Year 2,024 1,767 3,757
Wtd. Avg. Ex. Price, Outstanding at Beginning of Year $ 17 $ 16 $ 17
Wtd. Avg. Ex. Price, Granted $ 29 $ 21 $ 13
Wtd. Avg. Ex. Price, Exercised $ 16 $ 17 $ 16
Wtd. Avg. Ex. Price, Forfeited $ 19 $ 16 $ 18
Wtd. Avg. Ex. Price, Outstanding at End of Year $ 21 $ 17 $ 16
Wtd. Avg. Ex. Price, Exercisable at End of Year $ 17 $ 16 $ 17
Wtd. Avg. Remaining Contract Life, Outstanding at End of Year 3.5 3.5 3.1
Wtd. Avg. Remaining Contract Life, Exercisable at End of Year 2.3 2.3 1.9
Aggregate Intrinsic Value, Exercised $ 20,659 $ 20,706 $ 921
Aggregate Intrinsic Value, Outstanding at End of Year 66,295 85,374 21,024
Aggregate Intrinsic Value, Exercisable at End of Year 26,218 23,810 5,076
Non-Employee Director Stock Option Plan [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares, Outstanding at Beginning of Year 244 429 391
Shares, Granted 42 48 48
Shares, Exercised (94) (233)  
Shares, Forfeited     (10)
Shares, Outstanding at End of Year 192 244 429
Shares, Exercisable at End of Year 192 244 429
Wtd. Avg. Ex. Price, Outstanding at Beginning of Year $ 18 $ 16 $ 17
Wtd. Avg. Ex. Price, Granted $ 32 $ 21 $ 11
Wtd. Avg. Ex. Price, Exercised $ 17 $ 16  
Wtd. Avg. Ex. Price, Forfeited     $ 14
Wtd. Avg. Ex. Price, Outstanding at End of Year $ 21 $ 18 $ 16
Wtd. Avg. Ex. Price, Exercisable at End of Year $ 21 $ 18 $ 16
Wtd. Avg. Remaining Contract Life, Outstanding at End of Year 6.8 6.1 5.5
Wtd. Avg. Remaining Contract Life, Exercisable at End of Year 6.8 6.1 5.5
Aggregate Intrinsic Value, Exercised 1,362 1,932 0
Aggregate Intrinsic Value, Outstanding at End of Year 1,740 2,937 756
Aggregate Intrinsic Value, Exercisable at End of Year $ 1,740 $ 2,937 $ 756