Acquisitions - Additional Information (Detail) - USD ($)			3 Months Ended		6 Months Ended
	Jan. 08, 2016	Mar. 26, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
Allocation of purchase price to goodwill			$ 6,230,000,000		$ 6,230,000,000		$ 5,984,000,000
Total operating revenues			3,425,000,000	$ 3,315,000,000	6,601,000,000	$ 6,355,000,000
Consolidated net income			286,000,000	$ 273,000,000	542,000,000	$ 142,000,000
Revolving Credit Facility [Member]
Business Acquisition [Line Items]
Credit Facility, aggregate capacity			2,250,000,000		2,250,000,000
Southern Waste Systems [Member]
Business Acquisition [Line Items]
Total consideration, net of cash acquired, for business acquisitions closed during the year	$ 525,000,000
Allocation of purchase price to property and equipment	93,000,000
Allocation of purchase price to other intangible assets	182,000,000
Allocation of purchase price to goodwill	$ 250,000,000
Total operating revenues			39,000,000		76,000,000
Consolidated net income					$ 1,000,000
Southern Waste Systems [Member] | Maximum [Member]
Business Acquisition [Line Items]
Consolidated net income			$ 1,000,000
Deffenbaugh Disposal, Inc. [Member]
Business Acquisition [Line Items]
Total consideration, net of cash acquired, for business acquisitions closed during the year		$ 400,000,000