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Condensed Consolidating Financial Statements - Condensed Consolidating Statements of Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Condensed Income Statements, Captions [Line Items]
Comprehensive income (loss)	$ 325	$ (204)
Less: Comprehensive income (loss) attributable to noncontrolling interests	(2)	(2)
Comprehensive income (loss) attributable to Waste Management, Inc.	327	(202)
Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Comprehensive income (loss)	(611)	(504)
Comprehensive income (loss) attributable to Waste Management, Inc.	(611)	(504)
WM [Member]
Condensed Income Statements, Captions [Line Items]
Comprehensive income (loss)	260	(125)
Comprehensive income (loss) attributable to Waste Management, Inc.	260	(125)
WM Holdings [Member]
Condensed Income Statements, Captions [Line Items]
Comprehensive income (loss)	304	231
Comprehensive income (loss) attributable to Waste Management, Inc.	304	231
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Comprehensive income (loss)	372	194
Less: Comprehensive income (loss) attributable to noncontrolling interests	(2)	(2)
Comprehensive income (loss) attributable to Waste Management, Inc.	$ 374	$ 196

X

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=51831270

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=51831223

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=51831255

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4613674-111683

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569643-111683

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569616-111683

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4K
-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686

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