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Landfill and Environmental Remediation Liabilities - Summary (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Landfill and environmental remediation liabilities
Total, Environmental Remediation	$ 218
Current (in accrued liabilities)	155	$ 164
Long-term	2,262	2,222
Total	2,417	2,386
Landfill [Member]
Landfill and environmental remediation liabilities
Current (in accrued liabilities), Landfill	130	138
Long-term, Landfill	2,069	2,018
Total, Landfill	2,199	2,156
Environmental Remediation Liabilities [Member]
Landfill and environmental remediation liabilities
Current (in accrued liabilities), Environmental Remediation	25	26
Long-term, Environmental Remediation	193	204
Total, Environmental Remediation	$ 218	$ 230

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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