Earnings Per Share (Tables)

6 Months Ended

Mar. 31, 2012

Earnings Per Share Tables [Abstract]

Common Shares Outstanding and Anti-dilutive common shares

	Quarter Ended		Six Months Ended
Common Shares Outstanding and Anti-Dilutive Common Shares	March 31,		March 31,
(in millions)	2012	2011	2012	2011
Weighted average common shares outstanding, basic	537.5	594.4	544.1	599.0
Dilutive effect of equity-based compensation awards	6.9	6.7	6.7	5.6
Weighted average common shares outstanding, diluted	544.4	601.1	550.8	604.6
Anti-dilutive common shares	9.8	17.2	13.6	22.6