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Acquisitions and Divestitures (Detail)
$ / shares in Units, customer in Millions, $ in Millions
 1 Months Ended 2 Months Ended 12 Months Ended
Oct. 30, 2020
USD ($)
customer
$ / shares
Mar. 08, 2019
item
Oct. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
item
Business Acquisition [Line Items]              
Number of business acquired | item         4 18 32
Cash acquired from acquisitions         $ 36    
Total consideration         4,100 $ 515 $ 471
Business acquisitions cash payments           501 440
Other consideration         14   31
Payments made for contingent consideration           (6)  
Contingent consideration paid for acquisitions closed in previous year           4 6
Purchase price holdbacks paid       $ 3 3 20 20
Purchase price holdbacks paid for acquisitions closed in current year           9 15
Revenue         15,218 15,455 14,914
Operating expenses         9,341 9,496 9,249
Selling, general and administrative expenses         1,728 $ 1,631 $ 1,453
364-day revolving credit facility [Member]              
Business Acquisition [Line Items]              
Proceeds from Lines of Credit     $ 3,000        
Advanced Disposal [Member]              
Business Acquisition [Line Items]              
Total consideration $ 4,600            
Price per share | $ / shares $ 30.30            
Debt incurred for acquisition $ 1,800            
Number of customers | customer 3            
Business acquisition costs       156 $ 156    
Revenue       205      
Operating expenses       142      
Selling, general and administrative expenses       $ 60      
Petro Waste Environmental [Member]              
Business Acquisition [Line Items]              
Number of landfills | item   7