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Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Computation of basic and diluted loss per share
The following table sets forth the computation of basic and diluted loss per share.
(U.S. dollars in millions, except per share amounts)
Year Ended December 31
 
2018
 
2017
 
2016
Numerator:
 
 
 
 
 
Basic and diluted:
 
 
 
 
 
Net loss attributable to common shareholders
$
(276
)
 
$
(217
)
 
$
(53
)
 
 
 
 
 
 
Denominator:
 
 
 
 
 
Basic: Weighted average number of shares outstanding (in millions)
87.16

 
87.13

 
87.13

Diluted: Weighted-average number of shares outstanding, assuming dilution (in millions)1
87.16

 
87.13

 
87.13

 
 
 
 
 
 
Basic loss per share
$
(3.17
)
 
$
(2.49
)
 
$
(0.61
)
Diluted loss per share1
$
(3.17
)
 
$
(2.49
)
 
$
(0.61
)
1
Shares in the diluted loss per share calculation represent basic shares due to the net loss. The shares excluded from the calculation were 446,821 for the year ended December 31, 2018, because they are anti-dilutive and for the years ended December 31, 2017 and 2016, the shares excluded were zero.