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Commitments and Contingencies - Quarter (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) site item | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Commitments And Contingencies [Line Items] |  |  |
Number of landfills adjacent to or near homeowners' properties with agreements guaranteeing market value | item | 18 |  |
Environmental remediation reasonably possible additional losses high estimate | $ 135 |  |
Environmental remediation liabilities | $ 218 |  |
Number of sites listed on the EPA's NPL for which we have been notified we are a PRP | site | 73 |  |
Number of owned sites listed on the EPA's NPL for which we have been notified we are a PRP | site | 14 |  |
Number of non-owned sites listed on the EPA's NPL for which we have been notified we are a PRP | site | 59 |  |
Dollar threshold for environmental matters requiring disclosure under item 103 of the SEC's Regulation S-K | $ 1 |  |
Workforce covered by collective bargaining (as a percent) | 20.00% |  |
Expected time of completion of IRS audits | 24 months |  |
San Jacinto Waste Pits [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Environmental remediation liabilities | $ 54 |  | $ 55
Withdrawal from Multiemployer Pension Plans [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Charge to "Operating" expenses |  | $ 3 |
$3.5 billion revolving credit facility [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Credit Facility, aggregate capacity | $ 3,500 |  |

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