Acquisitions and Divestitures - Schedule of Final Allocations of Purchase Price (Detail) - USD ($) $ in Millions	Jan. 08, 2016	Mar. 26, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets subject to amortization, Amount			$ 212	$ 145	$ 9
Non-compete Covenant [Member]
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets subject to amortization, Amount			23	8	$ 2
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets subject to amortization, Amount			$ 4	$ 6
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] | Non-compete Covenant [Member]
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets subject to amortization, Weighted Average Amortization Periods		0 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] | Non-compete Covenant [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