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Acquisitions - Allocation of Purchase Price (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Jan. 08, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill $ 6,215   $ 5,984
Southern Waste Systems [Member]      
Business Acquisition [Line Items]      
Property and equipment   $ 93  
Goodwill 250 250  
Other intangible assets   182  
Total purchase price   $ 525  
Deffenbaugh Disposal, Inc. [Member]      
Business Acquisition [Line Items]      
Cash and cash equivalents 15    
Accounts and other receivables 22    
Parts and supplies 2    
Deferred income tax asset 11    
Other current assets 10    
Property and equipment 207    
Goodwill 159    
Other intangible assets 100    
Other assets 1    
Accounts payable (2)    
Accrued liabilities (20)    
Deferred revenues (6)    
Landfill and environmental remediation liabilities (18)    
Deferred income tax liability (52)    
Other liabilities (14)    
Total purchase price $ 415