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Income Taxes - Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Net operating loss, capital loss and tax credit carry-forwards	$ 186	$ 150
Landfill and environmental remediation liabilities	57	156
Operating lease liabilities	131	114
Miscellaneous and other reserves, net	99	150
Subtotal	473	570
Valuation allowance	(150)	(162)
Deferred tax liabilities:
Property and equipment	(956)	(842)
Goodwill and other intangibles	(1,059)	(865)
Operating lease right-of-use assets	(114)	(108)
Net deferred tax liabilities	$ (1,806)	$ (1,407)

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

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