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Commitments and Contingencies (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Contingencies And Commitments [Line Items]    
Maximum self insurance exposures per incident under general liability insurance program $ 5  
Maximum self insurance exposures per incident under workers' compensation insurance program 5  
Per incident base deductible under auto liability insurance program 10  
Insurance claims receivable 139 $ 126
Beginning Balance 575 567
Self-insurance expense 172 171
Cash paid and other (151) (163)
Other 68  
Ending Balance 664 575
Current portion 175 145
Long-term portion $ 489 $ 430
Expected time period in years for cash settlement of recorded obligations associated with insurance liabilities 6 years  
$3.5 billion revolving credit facility [Member]    
Contingencies And Commitments [Line Items]    
Credit Facility, aggregate capacity $ 3,500  
Advanced Disposal [Member]    
Contingencies And Commitments [Line Items]    
Other $ 68