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Earnings Per Share and Equity (Tables)
6 Months Ended
Jun. 30, 2011
Earnings Per Share and Equity Tables [Abstract]  
Reconciliation of basic and diluted earnings per share
   Three Months Ended June 30,  Six Months Ended June 30,
   2011  2010  2011  2010
             
Net income$620 $445 $1,288 $1,194
             
Average common shares outstanding — basic 663  661  663  661
Assumed exercise of stock options, performance share awards           
 and restricted stock 1  1  1  1
             
Average common shares outstanding — diluted 664  662  664  662