Basis of Presentation (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($) area	Sep. 30, 2016 USD ($)
Segment Reporting Information [Line Items]
Increase to net cash provided by operating activities	$ 2,390	$ 2,252
Increase to net cash used in financing activities	$ (1,404)	$ (711)
Solid Waste [Member]
Segment Reporting Information [Line Items]
Number of areas | area	17
Accounting Standards Update 2016-09 [Member] | Excess Tax Benefits Or Deficiencies [Member]
Segment Reporting Information [Line Items]
Increase to net cash provided by operating activities	$ 27
Increase to net cash used in financing activities	(27)
Accounting Standards Update 2016-09 [Member] | Tax Payments Associated with Equity Based Compensation Transactions [Member]
Segment Reporting Information [Line Items]
Increase to net cash provided by operating activities	18
Increase to net cash used in financing activities	$ (18)