Summary Quarterly Financial Data (Unaudited) - Summary of Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 455	$ 371	$ 184	$ 362	$ 456	$ 462	$ 489	$ 495	$ 1,373	$ 1,902	$ 2,228
Gross profit	72	54	3	53	76	73	77	85	182	311	430
Operating loss	(77)	(103)	(64)	(122)	(72)	(122)	(137)	(128)	(367)	(460)	(197)
Loss before income taxes	(85)	(132)	(88)	(208)	(91)	(136)	(152)	(142)	(512)	(521)	(253)
Net loss	(91)	(132)	(90)	(231)	(93)	(139)	(142)	(148)	(544)	(522)	(294)
Net loss attributable to common shareholders	$ (91)	$ (132)	$ (90)	$ (233)	$ (96)	$ (133)	$ (133)	$ (137)	$ (545)	$ (500)	$ (276)
Per Share Data:
Basic loss per share (in dollars per share)	$ (0.82)	$ (1.18)	$ (0.80)	$ (2.09)	$ (0.87)	$ (1.20)	$ (1.39)	$ (1.57)	$ (4.89)	$ (4.92)	$ (3.17)
Diluted loss per share (in dollars per share)	$ (0.82)	$ (1.18)	$ (0.80)	$ (2.09)	$ (0.87)	$ (1.20)	$ (1.39)	$ (1.57)	$ (4.89)	$ (4.92)	$ (3.17)