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Preferred And Common Stock (Schedule Of Activity For Stock Options) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Preferred And Common Stock [Abstract]      
Number of options, beginning of year 56.1 65.5 46.2
Weighted average exercise price, beginning of year $ 19.29 $ 24.44 $ 35.61
Number of options, Granted 4.5 9.0 27.1
Weighted average exercise price, granted $ 16.24 $ 13.52 $ 8.34
Number of options, Exercised (4.3) (1.6)  
Weighted average exercise price, exercised $ 8.59 $ 8.34  
Number of options, Expired or forfeited (9.5) (16.8) (7.8)
Weighted average exercise price, expired or forfeited $ 31.90 $ 37.21 $ 34.60
Number of options Outstanding, end of year 46.8 56.1 65.5
Weighted average exercise price outstanding, end of year $ 17.41 $ 19.29 $ 24.44
Number of options exercisable, end of year 28.8 30.2 37.7
Weighted average exercise price Exercisable, end of year $ 20.90 $ 26.91 $ 35.51