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Compensation Plans (Stock Options) (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Realized tax benefit from stock options exercised $ 35,000,000 $ 37,000,000 $ 36,000,000
Unrecognized stock-based compensation expense 52    
Unrecognized stock-based compensation expense, weighted-average recognition period, in years 1 year 9 months 29 days    
Stock Options Granted Between 2004 and 2008 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option term 6 years    
Vesting period 3 years    
Stock Options Granted Prior to 2004 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option term 10 years    
Stock Options Granted Between 2009 and 2012 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option term 7 years    
Requisite service period 6 months    
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant date fair value of options granted $ 11.81 $ 12.32 $ 6.44
Total intrinsic value of options exercised 147,000,000 216,000,000 109,000,000
Realized tax benefit from stock options exercised 49,000,000    
Unrecognized stock-based compensation expense $ 29,000,000    
Unrecognized stock-based compensation expense, weighted-average recognition period, in years 1 year 10 months 13 days