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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Basic and Diluted Earnings Per Share

Basic and diluted earnings per share are as follows:

 

 

 

Three Months Ended September 30,

 

 

Nine Months Ended September 30,

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

Net income/(loss) attributable to Willis Towers Watson

 

$

44

 

 

$

(54

)

 

$

317

 

 

$

323

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Basic average number of shares outstanding

 

 

131

 

 

 

134

 

 

 

132

 

 

 

136

 

Dilutive effect of potentially issuable shares

 

 

1

 

 

 

—

 

 

 

—

 

 

 

1

 

Diluted average number of shares outstanding

 

 

132

 

 

 

134

 

 

 

132

 

 

 

137

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Basic earnings/(loss) per share

 

$

0.34

 

 

$

(0.40

)

 

$

2.40

 

 

$

2.38

 

Dilutive effect of potentially issuable shares

 

 

(0.01

)

 

 

—

 

 

 

(0.01

)

 

 

(0.02

)

Diluted earnings/(loss) per share

 

$

0.33

 

 

$

(0.40

)

 

$

2.39

 

 

$

2.36