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Acquisitions - Additional Information (Detail) - USD ($)
 3 Months Ended
Jan. 08, 2016
Mar. 26, 2015
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Business Acquisition [Line Items]          
Total operating revenues     $ 3,176,000,000 $ 3,040,000,000  
Consolidated net income     256,000,000 $ (131,000,000)  
Allocation of purchase price to goodwill     6,215,000,000   $ 5,984,000,000
Revolving Credit Facility [Member]          
Business Acquisition [Line Items]          
Credit Facility, aggregate capacity     2,250,000,000    
Deffenbaugh Disposal, Inc. [Member]          
Business Acquisition [Line Items]          
Total consideration, net of cash acquired, for business acquisitions closed during the year   $ 400,000,000      
Allocation of purchase price to goodwill     159,000,000    
Southern Waste Systems [Member]          
Business Acquisition [Line Items]          
Total operating revenues     37,000,000    
Consolidated net income     1,000,000    
Total consideration, net of cash acquired, for business acquisitions closed during the year $ 525,000,000        
Allocation of purchase price to goodwill $ 250,000,000   $ 250,000,000