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Stock-Based Compensation (Summary Of Options Outstanding) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
years
Dec. 31, 2010
years
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2011
15.67 - 15.67 [Member]
years
Dec. 31, 2010
15.67 - 15.67 [Member]
Dec. 31, 2011
22.03 - 30.40 [Member]
years
Dec. 31, 2010
22.03 - 30.40 [Member]
Dec. 31, 2011
30.87 - 36.33 [Member]
years
Dec. 31, 2011
36.51 - 36.51 [Member]
years
Dec. 31, 2010
36.51 - 36.51 [Member]
Dec. 31, 2011
36.70 - 37.20 [Member]
years
Dec. 31, 2010
36.70 - 37.20 [Member]
Dec. 31, 2011
37.49 - 40.45 [Member]
years
Dec. 31, 2010
37.49 - 40.45 [Member]
Dec. 31, 2011
41.79 - 41.79 [Member]
years
Dec. 31, 2010
41.79 - 41.79 [Member]
Dec. 31, 2011
42.47 - 43.06 [Member]
years
Dec. 31, 2010
42.47 - 43.06 [Member]
Dec. 31, 2011
44.39 - 45.45 [Member]
years
Dec. 31, 2010
44.39 - 45.45 [Member]
Dec. 31, 2011
15.67 - 45.45 [Member]
years
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                                            
Range of Exercise Prices, Minimum         $ 15.67   $ 22.03   $ 30.87   $ 36.51   $ 36.70   $ 37.49   $ 41.79   $ 42.47 $ 44.39   $ 15.67
Range of Exercise Prices, Maximum           $ 15.67   $ 30.40 $ 36.33 $ 36.51   $ 37.20   $ 40.45   $ 41.79   $ 43.06     $ 45.45 $ 45.45
Number Of Options Outstanding 11,620,393 15,185,729 15,509,978 14,581,461 1,086,231   1,244,673   1,401,238 1,859,229   1,005,845   1,134,413   1,270,873   1,130,041   1,487,850   11,620,393
Weighted-average remaining contractual term (in years) 2.95 2.85     4.13   1.85   4.86 0.34   1.05   2.97   3.13   1.99   6.32   2.95
Options Outstanding, Weighted-Average Exercise Price $ 35.42 $ 34.09 $ 34.04 $ 35.60 $ 15.67   $ 28.49   $ 31.11 $ 36.51   $ 37.00   $ 37.69   $ 41.79   $ 42.78   $ 44.50   $ 35.42
Options Exercisable, Number Exercisable 8,265,818 11,830,076 12,384,363   431,969   1,226,486   71,188 1,859,229   994,084   1,125,948   1,270,873   1,130,041   156,000   8,265,818
Options Exercisable, Weighted-Average Exercise Price $ 36.28 $ 36.10 $ 34.98   $ 15.67   $ 28.50   $ 35.51 $ 36.51   $ 37.00   $ 37.68   $ 41.79   $ 42.78   $ 45.45   $ 36.28