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Earnings Per Share (Tables)
 6 Months Ended
Mar. 31, 2018
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):
 
Three Months Ended
March 31,
 
Six Months Ended
March 31,
 
2018
 
2017
 
2018
 
2017
Income (loss) Available to Ordinary
   Shareholders
     
 
 
 
 
 
 
 
Income (loss) from continuing operations
$
438

 
$
(148
)
 
$
668

 
$
224

Loss from discontinued operations
—

 
—

 
—

 
(43
)
Basic and diluted income (loss) available to
   shareholders
$
438

 
$
(148
)
 
$
668

 
$
181

 
 
 
 
 
 
 
 
Weighted Average Shares Outstanding
 
 
 
 
 
 
 
Basic weighted average shares outstanding
926.2

 
939.2

 
926.2

 
938.2

Effect of dilutive securities:
 
 
 
 
 
 
 
Stock options, unvested restricted stock and
     unvested performance share awards
6.3

 
—

 
6.7

 
9.8

Diluted weighted average shares outstanding
932.5

 
939.2

 
932.9

 
948.0

 
 
 
 
 
 
 
 
Antidilutive Securities
 
 
 
 
 
 
 
Options to purchase shares
1.4

 
—

 
1.2

 
0.1