Acquisitions and Divestitures - Preliminary Purchase Price Allocation of Other Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Greenstar LLC [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total intangible assets subject to amortization	$ 32
Total other intangible assets subject to amortization, Weighted average amortization period	10 years
Greenstar LLC [Member] | Supplier Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total intangible assets subject to amortization	31
Total other intangible assets subject to amortization, Weighted average amortization period	10 years
Greenstar LLC [Member] | Lease Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total intangible assets subject to amortization	1
Total other intangible assets subject to amortization, Weighted average amortization period	8 years 4 months 24 days
RCI Environnement Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total intangible assets subject to amortization	169
Total other intangible assets subject to amortization, Weighted average amortization period	14 years 7 months 6 days
RCI Environnement Inc [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total intangible assets subject to amortization	162
Total other intangible assets subject to amortization, Weighted average amortization period	15 years
RCI Environnement Inc [Member] | Trade Name [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total intangible assets subject to amortization	$ 7
Total other intangible assets subject to amortization, Weighted average amortization period	5 years