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Commitments and Contingencies - Other (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) site item | Dec. 31, 2019 USD ($) | Dec. 31, 2018 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 | $ 140 |  |
Environmental remediation liabilities | $ 230 |  |
Number of sites listed on the EPA's NPL for which we have been notified we are a PRP | site | 75 |  |
Number of owned sites listed on the EPA's NPL for which we have been notified we are a PRP | site | 15 |  |
Number of non-owned sites listed on the EPA's NPL for which we have been notified we are a PRP | site | 60 |  |
Workforce covered by collective bargaining (as a percent) | 20.00% |  |
Withdrawal from Multiemployer Pension Plans [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Charge to "Operating" expenses | $ 4 | $ 1 | $ 3
San Jacinto Waste Pits [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Environmental remediation liabilities | $ 55 | $ 56 |

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- Definition Environmental Remediation Reasonably Possible Additional Losses High Estimate + References No definition available. + Details
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- Definition Number of landfills adjacent to or near homeowners properties with agreements guaranteeing market value. + References No definition available. + Details
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- Definition Number of non-owned sites listed on the environmental protection agency's national priorities list for which we have been notified we are a PRP. + References No definition available. + Details
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