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Business Segments - Summary of Operating Results by Reportable Segment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue:
Total revenue	$ 751	$ 822	$ 2,312	$ 2,363
Operating profit:
Total operating loss	$ 14	$ 26	$ 54	$ 51
Operating profit % of revenue:
Total operating profit %	1.90%	3.20%	2.30%	2.20%
United States [Member]
Revenue:
Total revenue	$ 567	$ 630	$ 1,772	$ 1,792
Operating profit:
Total operating loss	$ 9	$ 21	$ 44	$ 40
Operating profit % of revenue:
Total operating profit %	1.60%	3.30%	2.50%	2.20%
Canada [Member]
Revenue:
Total revenue	$ 83	$ 93	$ 243	$ 270
Operating profit:
Total operating loss	$ 4	$ 5	$ 7	$ 10
Operating profit % of revenue:
Total operating profit %	4.80%	5.40%	2.90%	3.70%
International [Member]
Revenue:
Total revenue	$ 101	$ 99	$ 297	$ 301
Operating profit:
Total operating loss	$ 1		$ 3	$ 1
Operating profit % of revenue:
Total operating profit %	1.00%	0.00%	1.00%	0.30%