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Consolidated Statements of Income (Parenthetical) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Consolidated Statements of Income [Abstract]        
Earnings allocated to participating share awards and other items $ (15) $ (13) $ (30) $ (25)