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Acquisition of Advanced Disposal (Detail)
$ / shares in Units, customer in Millions, $ in Millions
3 Months Ended 9 Months Ended
Oct. 30, 2020
USD ($)
customer
$ / shares
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
May 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Nov. 30, 2020
USD ($)
Business Acquisition [Line Items]                
Goodwill   $ 9,006   $ 9,006     $ 8,994  
Revenue   4,665 $ 3,861 13,253 $ 11,151      
Operating expenses   2,906 2,332 8,156 6,841      
Selling, general and administrative expenses   469 $ 416 1,372 $ 1,218      
364-day revolving credit facility [Member]                
Business Acquisition [Line Items]                
Maximum capacity $ 3,000              
Senior Notes, Aggregate [Member]                
Business Acquisition [Line Items]                
Debt instrument face amount           $ 950   $ 2,500
Advanced Disposal [Member]                
Business Acquisition [Line Items]                
Price per share | $ / shares $ 30.30              
Total consideration $ 4,600              
Debt incurred for acquisition $ 1,800              
Number of customers | customer 3              
Goodwill   $ 2,495   $ 2,495