Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Computation of basic and diluted loss per share

(U.S. dollars in millions, except per share amounts)	Year Ended December 31
	2019		2018		2017
Numerator:
Basic and diluted:
Net loss attributable to common shareholders	$	(500)	$	(276)	$	(217)
Denominator:
Basic: Weighted average number of shares outstanding (in millions)	101.62		87.16		87.13
Diluted: Weighted-average number of shares outstanding, assuming dilution (in millions)	101.62		87.16		87.13
Basic loss per share	$	(4.92)	$	(3.17)	$	(2.49)
Diluted loss per share	$	(4.92)	$	(3.17)	$	(2.49)