Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Account receivable allowances	$ 6	$ 6
Accumulated depreciation and amortization	1	1
Stock-based compensation	46	46
Accrued compensation and benefits	89	75
Operating lease liabilities	136
Deferred rent		22
Deferred revenue	37	41
Net operating loss	13	16
Restructuring	4	5
Uncertain tax positions	94	81
Self-insured related reserves	8	8
Other	13	14
Total deferred tax assets	447	315
Deferred tax liabilities:
Accumulated depreciation and amortization of intangible assets and capitalized software	(389)	(395)
ROU Assets	(107)	0
Capital gains	(23)	(24)
Self-insured related income	(8)	(8)
Stock based compensation	(2)	(2)
New revenue accounting standard - ASC 606	(12)	(19)
Unrealized gain on net investment hedges - OCI	(22)	(10)
Other liabilities	(3)	(7)
Total deferred tax liabilities	(566)	(465)
Net deferred tax liabilities	(119)	(150)
Valuation allowance	(9)	(5)	$ (6)	$ (3)
Total net deferred tax liabilities	$ (128)	$ (155)