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Earnings Per Share (Tables)
 12 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Earnings Per Share
The following table reconciles the numerators and denominators used to calculate basic and diluted earnings per share (in millions):
 
Year Ended September 30,
 
2017
 
2016
 
2015
Income (Loss) Available to Ordinary Shareholders
 
 
 
 
 
Income from continuing operations
$
1,654

 
$
732

 
$
814

Income (loss) from discontinued operations
(43
)
 
(1,600
)
 
749

Basic and diluted income (loss) available to shareholders
$
1,611

 
$
(868
)
 
$
1,563

 
 
 
 
 
 
Weighted Average Shares Outstanding
 
 
 
 
 
Basic weighted average shares outstanding
935.3

 
667.4

 
655.2

Effect of dilutive securities:
 
 
 
 
 
Stock options, unvested restricted stock and unvested
     performance share awards
9.3

 
5.2

 
6.3

Diluted weighted average shares outstanding
944.6

 
672.6

 
661.5

 
 
 
 
 
 
Antidilutive Securities
 
 
 
 
 
Options to purchase common shares
0.2

 
—

 
0.4