Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2020

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 for the year ended December 31, 2020, 2019 and 2018.

(U.S. dollars in millions, except per share amounts)	Year Ended December 31
	2020		2019		2018
Numerator:
Basic and diluted:
Net loss attributable to common shareholders	$	(545)	$	(500)	$	(276)
Denominator:
Basic: Weighted average number of shares outstanding (in millions)	111.56		101.62		87.16
Diluted: Weighted-average number of shares outstanding, assuming dilution (in millions)	111.56		101.62		87.16
Basic loss per share	$	(4.89)	$	(4.92)	$	(3.17)
Diluted loss per share	$	(4.89)	$	(4.92)	$	(3.17)