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Landfill and Environmental Remediation Liabilities - Summary (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Landfill and environmental remediation liabilities
Total, Environmental Remediation	$ 230
Current (in accrued liabilities)	164	$ 165
Long-term	2,222	1,930
Total	2,386	2,095
Landfill [Member]
Landfill and environmental remediation liabilities
Current (in accrued liabilities), Landfill	138	138
Long-term, Landfill	2,018	1,717
Total, Landfill	2,156	1,855
Environmental Remediation Liabilities [Member]
Landfill and environmental remediation liabilities
Current (in accrued liabilities), Environmental Remediation	26	27
Long-term, Environmental Remediation	204	213
Total, Environmental Remediation	$ 230	$ 240

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

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