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Quarterly Information (unaudited) (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 588	$ 526	$ 544	$ 506	$ 626	$ 526	$ 513	$ 491	$ 2,164	$ 2,156	$ 2,322
Gross profit	289	264	250	223	307	250	242	225	1,026	1,024	1,189
Operating (loss) income	23	14	10	(4)	60	9	(1)	0	43	68	235
Net income (loss)	$ 15	$ 18	$ 4	$ (7)	$ (74)	$ 13	$ (4)	$ (2)	$ 30	$ (67)	$ 125
Net (loss) income per share:
Basic (in usd per share)	$ 0.13	$ 0.15	$ 0.03	$ (0.06)	$ (0.61)	$ 0.11	$ (0.03)	$ (0.02)	$ 0.25	$ (0.53)	$ 0.96
Diluted (in usd per share)	$ 0.13	$ 0.15	$ 0.03	$ (0.06)	$ (0.61)	$ 0.10	$ (0.03)	$ (0.02)	$ 0.25	$ (0.53)	$ 0.95
Tax Cuts and Jobs Act of 2017, existing income tax expense (benefit)					$ 126

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