XML 108 R85.htm IDEA: XBRL DOCUMENT v3.6.0.2

Commitments and Contingencies - Changes to Net Insurance Liabilities (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Expected time period in years for cash settlement of substantially all recorded obligations associated with insurance liabilities	6 years

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Expected time period in years for cash settlement of substantially all recorded obligations associated with insurance liabilities.

+ References

No definition available.

+ Details

Name:	wm_ExpectedTimePeriodInTermsForCashSettlementOfSubstantiallyAllRecordedObligationsAssociatedWithInsuranceLiabilities
Namespace Prefix:	wm_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration