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Consolidated Statements of Income (Unaudited) (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]        
Excise tax collections $ 116 $ 99 $ 235 $ 208