Earnings per Share (EPS) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019
Earnings Per Share [Abstract]
Basic weighted average shares outstanding (shares)	432.7	436.8
Effect of Employee Stock Option Shares (shares)	1.3	1.4
Effect of Employee Restricted Stock Shares (shares)	1.4	1.7
Diluted weighted average shares outstanding (shares)	435.4	439.9
Basic EPS from continuing operations (in US$ per share)	$ 1.35	$ 1.16
Diluted EPS from continuing operations (in US$ per share)	$ 1.34	$ 1.15
Net earnings	$ 582.4	$ 505.4	$ 2,292.8
Options excluded from the calculation of diluted earnings per share (shares)	0.7	0.3