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Landfill and Environmental Remediation Liabilities - Changes (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Landfill and environmental remediation liabilities |  |
Interest accretion | $ 26 | $ 24
Ending balance, environmental remediation | 218 |
Landfill [Member] |  |
Landfill and environmental remediation liabilities |  |
Beginning balance, landfill | 2,156 |
Obligations incurred and capitalized | 26 |
Obligations settled | (16) |
Interest accretion | 26 |
Revisions in estimates and interest rate assumptions | 7 |
Ending balance, landfill | 2,199 |
Environmental Remediation Liabilities [Member] |  |
Landfill and environmental remediation liabilities |  |
Beginning balance, environmental remediation | 230 |
Obligations settled | (5) |
Revisions in estimates and interest rate assumptions | (7) |
Ending balance, environmental remediation | $ 218 |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
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- Definition Amount of expense (reversal of expense) which increases (decreases) the accrual for environmental loss contingencies from revisions in estimates to existing obligations. Excludes changes related to business acquisitions, divestitures, or currency movement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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