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Commitments and Contingencies (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
May 31, 2018
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 130 $ 153  
Beginning Balance 582 588  
Self-insurance expense (benefit) 142 142  
Cash paid and other (157) (148)  
Ending Balance 567 582  
Current portion 137 107  
Long-term portion $ 430 $ 475  
Expected time period in years for cash settlement of recorded obligations associated with insurance liabilities 6 years    
Revolving Credit Facility [Member]      
Contingencies And Commitments [Line Items]      
Credit Facility, aggregate capacity $ 2,750   $ 2,250