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Earnings per share
 6 Months Ended
Jun. 30, 2011
Earnings per share [Abstract]  
Earnings per share
Note 5 — Earnings per share
     Basic earnings per share (“EPS”) is computed using the weighted average number of common shares outstanding during the period. Diluted EPS is computed in the same manner as basic earnings per share but adds the number of additional common shares that would have been outstanding for the period if the dilutive potential common shares had been issued. All shares are calculated under the “treasury stock” method. The following is the reconciliation between the number of weighted average shares used in the basic and diluted EPS calculations for all periods:
                                 
    Three Months Ended     Six Months Ended  
    June 30,     June 30,  
(in millions)   2011(1)     2010     2011(1)     2010  
 
Weighted average number of common shares outstanding during the period — Basic EPS(2)
    502.6       544.5       515.7       547.1  
Dilutive common stock equivalents: (3)
                               
Outstanding stock options, “stock-settled” stock appreciation rights (“SSRs”), restricted stock units, and executive deferred compensation units(2)
    4.4       5.6       4.6       5.8  
     
Weighted average number of common shares outstanding during the period — Diluted EPS(2)
    507.0       550.1       520.3       552.9  
     
 
(1)   The decrease in weighted average number of common shares outstanding for the three and six months ended June 30, 2011 for Basic and Diluted EPS resulted from the 26.9 million treasury shares repurchased in the year ended December 31, 2010 and the 42.4 million treasury shares repurchased during the first six months of 2011.
 
(2)   Excludes awards of 2.6 million and 2.5 million for the three months ended June 30, 2011 and 2010, respectively and 2.8 million for the six months ended both June 30, 2011 and 2010. These were excluded because their effect was anti-dilutive.
 
(3)   Dilutive common stock equivalents do not include the 2.7 million shares that we would receive if the Accelerated Share Repurchase agreement discussed in Note 7 were settled as of June 30, 2011. These were excluded because their effect was anti-dilutive.