Segment and Related Information - Summary (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Operating revenues	$ 3,861		$ 3,967	$ 11,151	$ 11,609
Income from operations	680		734	1,780	2,051
Asset impairments		$ 61
Landfills and Oil Field Waste Injection Facility [Member]
Segment Reporting Information [Line Items]
Asset impairments		41
Operating Group Total [Member]
Segment Reporting Information [Line Items]
Operating revenues	3,861		3,967	11,151	11,609
Income from operations	939		935	2,469	2,682
Solid Waste [Member]
Segment Reporting Information [Line Items]
Operating revenues	3,269		3,411	9,505	9,946
Income from operations	946		960	2,511	2,774
Tier 1 [Member]
Segment Reporting Information [Line Items]
Operating revenues	1,226		1,281	3,596	3,749
Income from operations	430		436	1,139	1,268
Tier 1 [Member] | Energy Services Assets [Member]
Segment Reporting Information [Line Items]
Asset impairments		$ 41
Tier 2 [Member]
Segment Reporting Information [Line Items]
Operating revenues	775		799	2,216	2,317
Income from operations	226		226	596	656
Tier 3 [Member]
Segment Reporting Information [Line Items]
Operating revenues	1,268		1,331	3,693	3,880
Income from operations	290		298	776	850
Other [Member]
Segment Reporting Information [Line Items]
Operating revenues	592		556	1,646	1,663
Income from operations	(7)		(25)	(42)	(92)
Asset impairments					16
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues	4,692		4,804	13,544	14,036
Operating Segments [Member] | Operating Group Total [Member]
Segment Reporting Information [Line Items]
Operating revenues	4,692		4,804	13,544	14,036
Operating Segments [Member] | Solid Waste [Member]
Segment Reporting Information [Line Items]
Operating revenues	4,077		4,215	11,821	12,279
Operating Segments [Member] | Tier 1 [Member]
Segment Reporting Information [Line Items]
Operating revenues	1,521		1,576	4,442	4,602
Operating Segments [Member] | Tier 2 [Member]
Segment Reporting Information [Line Items]
Operating revenues	984		998	2,813	2,897
Operating Segments [Member] | Tier 3 [Member]
Segment Reporting Information [Line Items]
Operating revenues	1,572		1,641	4,566	4,780
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating revenues	615		589	1,723	1,757
Intercompany Operating Revenues [Member]
Segment Reporting Information [Line Items]
Operating revenues	(831)		(837)	(2,393)	(2,427)
Intercompany Operating Revenues [Member] | Operating Group Total [Member]
Segment Reporting Information [Line Items]
Operating revenues	(831)		(837)	(2,393)	(2,427)
Intercompany Operating Revenues [Member] | Solid Waste [Member]
Segment Reporting Information [Line Items]
Operating revenues	(808)		(804)	(2,316)	(2,333)
Intercompany Operating Revenues [Member] | Tier 1 [Member]
Segment Reporting Information [Line Items]
Operating revenues	(295)		(295)	(846)	(853)
Intercompany Operating Revenues [Member] | Tier 2 [Member]
Segment Reporting Information [Line Items]
Operating revenues	(209)		(199)	(597)	(580)
Intercompany Operating Revenues [Member] | Tier 3 [Member]
Segment Reporting Information [Line Items]
Operating revenues	(304)		(310)	(873)	(900)
Intercompany Operating Revenues [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating revenues	(23)		(33)	(77)	(94)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Income from operations	$ (259)		$ (201)	$ (689)	$ (631)