Acquisitions and Divestitures - Purchase Price Allocation (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
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)
Landfill and environmental remediation liabilities	(2)
Current portion of long-term debt	(4)
Long-term debt, less current portion	(2)
Other liabilities	(5)
Total purchase price	206
RCI Environnement Inc [Member]
Business Acquisition [Line Items]
Accounts and other receivables	32
Property and equipment	117
Goodwill	191
Other intangible assets	169
Deferred revenues	(4)
Landfill and environmental remediation liabilities	(1)
Long-term debt, less current portion	(3)
Deferred income taxes, net	(14)
Total purchase price	$ 487