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Commitments and Contingencies - Changes to Net Insurance Liabilities (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Contingencies And Commitments [Line Items]      
Beginning Balance $ 425 $ 414 $ 393
Self-insurance expense (benefit) 101 130 126
Cash (paid) received (109) (119) (105)
Ending Balance 417 425 414
Current portion at December 31, 2016 113    
Long-term portion at December 31, 2016 304    
Gross Claims Liability [Member]      
Contingencies And Commitments [Line Items]      
Beginning Balance 643 597 590
Self-insurance expense (benefit) 71 169 135
Cash (paid) received (126) (123) (128)
Ending Balance 588 643 597
Current portion at December 31, 2016 133    
Long-term portion at December 31, 2016 455    
Receivables Associated with Insured Claims [Member]      
Contingencies And Commitments [Line Items]      
Beginning Balance (218) (183) (197)
Self-insurance expense (benefit) 30 (39) (9)
Cash (paid) received 17 4 23
Ending Balance (171) $ (218) $ (183)
Current portion at December 31, 2016 (20)    
Long-term portion at December 31, 2016 $ (151)