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Acquisitions - Schedule of Final and Preliminary Allocations of Purchase Price (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Jan. 08, 2016
Deffenbaugh Disposal, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets subject to amortization, Amount	$ 100
Total other intangible assets subject to amortization, Weighted Average Amortization Periods	15 years
Deffenbaugh Disposal, Inc. [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets subject to amortization, Amount	$ 94
Total other intangible assets subject to amortization, Weighted Average Amortization Periods	15 years
Deffenbaugh Disposal, Inc. [Member] | Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets subject to amortization, Amount	$ 6
Total other intangible assets subject to amortization, Weighted Average Amortization Periods	15 years
Southern Waste Systems [Member]
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets subject to amortization, Amount		$ 182
Total other intangible assets subject to amortization, Weighted Average Amortization Periods		9 years 6 months
Southern Waste Systems [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets subject to amortization, Amount		$ 160
Total other intangible assets subject to amortization, Weighted Average Amortization Periods		10 years
Southern Waste Systems [Member] | Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets subject to amortization, Amount		$ 18
Total other intangible assets subject to amortization, Weighted Average Amortization Periods		5 years
Southern Waste Systems [Member] | Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets subject to amortization, Amount		$ 4
Total other intangible assets subject to amortization, Weighted Average Amortization Periods		10 years

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275

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- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472

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+ References

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