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Acquisitions and Divestitures (Detail)
$ in Millions
 12 Months Ended
Jan. 08, 2016
USD ($)
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
item
May 31, 2018
USD ($)
Business Acquisition [Line Items]          
Number of business acquired | item   32 24 30  
Consideration, net of cash acquired, for business acquisitions   $ 471 $ 205 $ 604  
Business acquisitions closed during the year, cash payments   440 183 581  
Other consideration   31 22 23  
Contingent consideration paid for acquisitions closed in previous year   6 3 4  
Purchase price holdbacks paid   20 14 26  
Purchase price holdbacks paid for acquisitions closed in current year   15 13 16  
Allocation of consideration to property and equipment   115 127 115  
Allocation of consideration to other intangible assets   141 46 212  
Allocation of consideration to goodwill   248 39 280  
Revolving Credit Facility [Member]          
Business Acquisition [Line Items]          
Credit Facility, aggregate capacity   2,750     $ 2,250
Other Intangible Assets [Member]          
Business Acquisition [Line Items]          
Allocation of consideration to other intangible assets   1      
Customer and Supplier Relationships [Member]          
Business Acquisition [Line Items]          
Allocation of consideration to other intangible assets   124 39 185  
Covenants not-to-compete [Member]          
Business Acquisition [Line Items]          
Allocation of consideration to other intangible assets   $ 16 $ 7 23  
Trade Name [Member]          
Business Acquisition [Line Items]          
Allocation of consideration to other intangible assets       $ 4  
Southern Waste Systems [Member]          
Business Acquisition [Line Items]          
Consideration, net of cash acquired, for business acquisitions $ 525        
Allocation of consideration to property and equipment 93        
Allocation of consideration to other intangible assets 182        
Allocation of consideration to goodwill 250        
Southern Waste Systems [Member] | Customer and Supplier Relationships [Member]          
Business Acquisition [Line Items]          
Allocation of consideration to other intangible assets 160        
Southern Waste Systems [Member] | Covenants not-to-compete [Member]          
Business Acquisition [Line Items]          
Allocation of consideration to other intangible assets 18        
Southern Waste Systems [Member] | Trade Name [Member]          
Business Acquisition [Line Items]          
Allocation of consideration to other intangible assets $ 4