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Condensed Consolidating Financial Statements - Condensed Consolidating Statements of Comprehensive Income (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Condensed Income Statements, Captions [Line Items]      
Comprehensive income $ 1,207us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest $ 91us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest $ 881us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Less: Comprehensive income attributable to noncontrolling interests 40us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest 32us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest 43us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Comprehensive income attributable to Waste Management, Inc. 1,167us-gaap_ComprehensiveIncomeNetOfTax 59us-gaap_ComprehensiveIncomeNetOfTax 838us-gaap_ComprehensiveIncomeNetOfTax
Eliminations [Member]      
Condensed Income Statements, Captions [Line Items]      
Comprehensive income (2,580)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(645)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(2,080)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Comprehensive income attributable to Waste Management, Inc. (2,580)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(645)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(2,080)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
WM [Member]      
Condensed Income Statements, Captions [Line Items]      
Comprehensive income 1,300us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
112us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
807us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Comprehensive income attributable to Waste Management, Inc. 1,300us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
112us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
807us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
WM Holdings [Member]      
Condensed Income Statements, Captions [Line Items]      
Comprehensive income 1,510us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
313us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,034us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Comprehensive income attributable to Waste Management, Inc. 1,510us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
313us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,034us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Non-Guarantor Subsidiaries [Member]      
Condensed Income Statements, Captions [Line Items]      
Comprehensive income 977us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
311us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
1,120us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Less: Comprehensive income attributable to noncontrolling interests 40us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
32us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
43us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Comprehensive income attributable to Waste Management, Inc. $ 937us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
$ 279us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
$ 1,077us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember