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Income Taxes (Narrative) (Details) (USD $)
In Millions
3 Months Ended6 Months Ended
Mar. 31, 2010
Jun. 30, 2011
Oct. 31, 2011
Sep. 30, 2011
Income Taxes (Narrative) [Abstract]    
Additional deferred income tax expense from healthcare legislation$ 18   
Amount of unrecognized tax benefits   70
Deferred state tax benefit  65 
Impact of ceiling test charge included in foreign income taxed at different rates $ 53