Business Segments - Summary of Financial Information of Company's Reportable Segments (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenue	$ 1,619	$ 2,951	$ 3,127
Operating profit (loss)	(420)	(83)	73
Impairment charges	321	128
Depreciation and amortization	28	41	41
Property, plant and equipment, net	98	120	106
Total assets	1,008	1,591	1,795
United States [Member]
Segment Reporting Information [Line Items]
Revenue	1,153	2,240	2,371
Operating profit (loss)	(281)	(6)	57
Impairment charges	189	43
Depreciation and amortization	23	30	30
Property, plant and equipment, net	70	84	73
Total assets	714	1,034	1,148
Canada [Member]
Segment Reporting Information [Line Items]
Revenue	209	319	358
Operating profit (loss)	(60)	(19)	14
Impairment charges	60	27
Depreciation and amortization	2	2	2
Property, plant and equipment, net	12	14	12
Total assets	141	259	294
International [Member]
Segment Reporting Information [Line Items]
Revenue	257	392	398
Operating profit (loss)	(79)	(58)	2
Impairment charges	72	58
Depreciation and amortization	3	9	9
Property, plant and equipment, net	16	22	21
Total assets	$ 153	$ 298	$ 353