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Debt - Covenants (Detail) | 12 Months Ended
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Dec. 31, 2017
Minimum [Member] |
Debt Instrument Covenant Compliance [Line Items] |
Interest Coverage Ratio | 2.75
Maximum [Member] |
Debt Instrument Covenant Compliance [Line Items] |
Debt to EBITDA ratio | 3.50

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- Definition Debt Instrument Covenant Compliance [Line Items] + References No definition available. + Details
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Namespace Prefix: | wm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The ratio of debt to EBITDA required to be maintained under the terms of the debt agreement. + References No definition available. + Details
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Namespace Prefix: | wm_
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- Definition Debt Instrument Covenant Interest Coverage Ratio One + References No definition available. + Details
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Namespace Prefix: | wm_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |