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Income Taxes - Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Net operating loss, capital loss and tax credit carry-forwards	$ 258	$ 259
Landfill and environmental remediation liabilities	143	121
Miscellaneous and other reserves, net	175	96
Subtotal	576	476
Valuation allowance	(261)	(264)
Deferred tax liabilities:
Property and equipment	(752)	(595)
Goodwill and other intangibles	(854)	(865)
Net deferred tax liabilities	(1,291)	$ (1,248)
Increase (decrease) valuation allowance	$ (3)

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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