Acquisitions - Purchase Price Allocation (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Jul. 05, 2013
Greenstar LLC [Member]
Business Acquisition [Line Items]
Accounts and other receivables	$ 30
Parts and supplies	4
Other current assets	2
Property and equipment	58
Goodwill	122
Other intangible assets	32
Accounts payable	(17)
Accrued liabilities	(12)
Deferred revenues
Landfill and environmental remediation liabilities	(2)
Deferred income taxes, net
Current portion of long-term debt	(4)
Long-term debt, less current portion	(2)
Other liabilities	(5)
Total purchase price	206
RCI Environnment Inc [Member]
Business Acquisition [Line Items]
Accounts and other receivables	32	32
Parts and supplies
Other current assets
Property and equipment	117	118
Goodwill	191	177
Other intangible assets	169	169
Accounts payable
Accrued liabilities
Deferred revenues	(4)	(4)
Landfill and environmental remediation liabilities	(1)	(1)
Deferred income taxes, net	(14)
Current portion of long-term debt
Long-term debt, less current portion	(3)	(4)
Other liabilities
Total purchase price	487	487
RCI Environnment Inc [Member] | Adjustments [Member]
Business Acquisition [Line Items]
Accounts and other receivables
Parts and supplies
Other current assets
Property and equipment	(1)
Goodwill	14
Other intangible assets
Accounts payable
Accrued liabilities
Deferred revenues
Landfill and environmental remediation liabilities
Deferred income taxes, net	(14)
Current portion of long-term debt
Long-term debt, less current portion	1
Other liabilities
Total purchase price