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Loss per share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per share
The following table sets forth the computation of basic and diluted loss per share for the three and nine months ended September 30, 2018 and 2017.
(U.S. dollars in millions, except per share amounts)
Three Months Ended September 30
 
Nine Months Ended September 30
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Basic and diluted:
 
 
 
 
 
 
 
Net loss attributable to common shareholders
$
(68
)
 
$
(33
)
 
$
(162
)
 
$
(81
)
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Basic: Weighted average number of shares outstanding (in millions)
87.15

 
87.13

 
87.15

 
87.13

Diluted: Weighted-average number of shares outstanding, assuming dilution (in millions)1
87.15

 
87.13

 
87.15

 
87.13

 
 
 
 
 
 
 
 
Basic loss per share
(0.78)
 
(0.38)
 
(1.86)
 
(0.93)
Diluted loss per share
(0.78)
 
(0.38)
 
(1.86)
 
(0.93)
1 Shares in the diluted loss per share calculation represent basic shares due to the net loss. The shares excluded from the calculation were 815,627 for the three and nine months ended September 30, 2018 and 2017 because they are anti-dilutive.