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Property and Equipment - Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment      
Depreciation and amortization expense $ 1,477 $ 1,376 $ 1,301
Tangible Property and Equipment [Member]      
Property, Plant and Equipment      
Depreciation and amortization expense 838 783 773
Landfill Airspace [Member]      
Property, Plant and Equipment      
Depreciation and amortization expense 538 497 428
Property and Equipment [Member]      
Property, Plant and Equipment      
Depreciation and amortization expense $ 1,376 $ 1,280 $ 1,201