Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred income tax assets
Employee pensions and other liabilities	$ 49	$ 50
Other balance sheet reserves and allowances	18	13
Tax loss and credit carryforwards	63	59
Deferred revenue	20	3
Other	0	2
Total deferred income tax assets	150	127
Valuation allowance	(39)	(32)
Net deferred income tax assets	111	95
Deferred income tax liabilities
Intangibles and capitalized software	17	30
Property and equipment	11	12
Other	19	0
Total deferred income tax liabilities	47	42
Total net deferred income tax assets	$ 64	$ 53