Segment and Related Information - Summary (Detail) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Operating revenues	$ 4,665		$ 3,861		$ 13,253	$ 11,151
Income from operations	806		680		2,247	1,780
Asset impairments		$ 6	7			61
Landfills and Oil Field Waste Injection Facility [Member]
Segment Reporting Information [Line Items]
Asset impairments				$ 41		41
Landfill [Member]
Segment Reporting Information [Line Items]
Asset impairments				$ 20		20
Operating Group Total [Member]
Segment Reporting Information [Line Items]
Operating revenues	4,665		3,861		13,253	11,151
Income from operations	1,096		937		3,092	2,469
Solid Waste [Member]
Segment Reporting Information [Line Items]
Operating revenues	3,886		3,269		11,135	9,505
Income from operations	1,087		944		3,061	2,511
Tier 1 [Member]
Segment Reporting Information [Line Items]
Operating revenues	1,016		861		2,889	2,500
Income from operations	357		314		1,014	872
Tier 2 [Member]
Segment Reporting Information [Line Items]
Operating revenues	1,206		1,002		3,471	2,935
Income from operations	338		307		960	784
Tier 3 [Member]
Segment Reporting Information [Line Items]
Operating revenues	1,664		1,406		4,775	4,070
Income from operations	392		323		1,087	855
Other [Member]
Segment Reporting Information [Line Items]
Operating revenues	779		592		2,118	1,646
Income from operations	9		(7)		31	(42)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues	5,643		4,692		16,049	13,544
Operating Segments [Member] | Operating Group Total [Member]
Segment Reporting Information [Line Items]
Operating revenues	5,643		4,692		16,049	13,544
Operating Segments [Member] | Solid Waste [Member]
Segment Reporting Information [Line Items]
Operating revenues	4,836		4,077		13,848	11,821
Operating Segments [Member] | Tier 1 [Member]
Segment Reporting Information [Line Items]
Operating revenues	1,249		1,055		3,551	3,054
Operating Segments [Member] | Tier 2 [Member]
Segment Reporting Information [Line Items]
Operating revenues	1,533		1,276		4,423	3,726
Operating Segments [Member] | Tier 3 [Member]
Segment Reporting Information [Line Items]
Operating revenues	2,054		1,746		5,874	5,041
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating revenues	807		615		2,201	1,723
Intercompany Operating Revenues [Member]
Segment Reporting Information [Line Items]
Operating revenues	(978)		(831)		(2,796)	(2,393)
Intercompany Operating Revenues [Member] | Operating Group Total [Member]
Segment Reporting Information [Line Items]
Operating revenues	(978)		(831)		(2,796)	(2,393)
Intercompany Operating Revenues [Member] | Solid Waste [Member]
Segment Reporting Information [Line Items]
Operating revenues	(950)		(808)		(2,713)	(2,316)
Intercompany Operating Revenues [Member] | Tier 1 [Member]
Segment Reporting Information [Line Items]
Operating revenues	(233)		(194)		(662)	(554)
Intercompany Operating Revenues [Member] | Tier 2 [Member]
Segment Reporting Information [Line Items]
Operating revenues	(327)		(274)		(952)	(791)
Intercompany Operating Revenues [Member] | Tier 3 [Member]
Segment Reporting Information [Line Items]
Operating revenues	(390)		(340)		(1,099)	(971)
Intercompany Operating Revenues [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating revenues	(28)		(23)		(83)	(77)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Income from operations	$ (290)		$ (257)		$ (845)	$ (689)