Segment and Related Information - Summary (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Operating revenues	$ 3,846	$ 3,967	$ 3,946	$ 3,696	$ 3,842	$ 3,822	$ 3,739	$ 3,511	$ 15,455	$ 14,914	$ 14,485
Income from operations	655	$ 734	$ 696	$ 621	767	$ 699	$ 715	$ 608	2,706	2,789	2,636
Depreciation and amortization									1,574	1,477	1,376
Capital Expenditures									1,815	1,671	1,568
Total Assets	27,743				22,650				27,743	22,650	21,829
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues									18,704	18,024	17,370
Total Assets	28,010				22,896				28,010	22,896	22,116
Intercompany Operating Revenues [Member]
Segment Reporting Information [Line Items]
Operating revenues									(3,249)	(3,110)	(2,885)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Income from operations									(763)	(540)	(585)
Depreciation and amortization									36	30	45
Capital Expenditures									407	200	92
Total Assets	5,042				1,487				5,042	1,487	1,327
Elimination of Intercompany Investments and Advances [Member]
Segment Reporting Information [Line Items]
Total Assets	(267)				(246)				(267)	(246)	(287)
Operating Group Total [Member]
Segment Reporting Information [Line Items]
Operating revenues									15,455	14,914	14,485
Operating Group Total [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues									18,704	18,024	17,370
Income from operations									3,469	3,329	3,221
Depreciation and amortization									1,538	1,447	1,331
Capital Expenditures									1,408	1,471	1,476
Total Assets	22,968				21,409				22,968	21,409	20,789
Operating Group Total [Member] | Intercompany Operating Revenues [Member]
Segment Reporting Information [Line Items]
Operating revenues									(3,249)	(3,110)	(2,885)
Solid Waste [Member]
Segment Reporting Information [Line Items]
Operating revenues									13,260	12,622	12,167
Solid Waste [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues									16,387	15,537	14,832
Income from operations									3,672	3,395	3,289
Depreciation and amortization									1,463	1,356	1,228
Capital Expenditures									1,290	1,399	1,383
Total Assets	21,320				19,838				21,320	19,838	19,004
Solid Waste [Member] | Intercompany Operating Revenues [Member]
Segment Reporting Information [Line Items]
Operating revenues									(3,127)	(2,915)	(2,665)
Tier 1 [Member]
Segment Reporting Information [Line Items]
Operating revenues									4,995	4,685	4,454
Tier 1 [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues									6,136	5,730	5,441
Income from operations									1,682	1,619	1,506
Depreciation and amortization									551	493	438
Capital Expenditures									508	584	588
Total Assets	7,519				6,736				7,519	6,736	6,305
Tier 1 [Member] | Intercompany Operating Revenues [Member]
Segment Reporting Information [Line Items]
Operating revenues									(1,141)	(1,045)	(987)
Tier 2 [Member]
Segment Reporting Information [Line Items]
Operating revenues									3,088	2,951	2,945
Tier 2 [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues									3,865	3,675	3,599
Income from operations									854	784	777
Depreciation and amortization									327	317	274
Capital Expenditures									329	322	308
Total Assets	5,558				5,224				5,558	5,224	5,214
Tier 2 [Member] | Intercompany Operating Revenues [Member]
Segment Reporting Information [Line Items]
Operating revenues									(777)	(724)	(654)
Tier 3 [Member]
Segment Reporting Information [Line Items]
Operating revenues									5,177	4,986	4,768
Tier 3 [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues									6,386	6,132	5,792
Income from operations									1,136	992	1,006
Depreciation and amortization									585	546	516
Capital Expenditures									453	493	487
Total Assets	8,243				7,878				8,243	7,878	7,485
Tier 3 [Member] | Intercompany Operating Revenues [Member]
Segment Reporting Information [Line Items]
Operating revenues									(1,209)	(1,146)	(1,024)
Other [Member]
Segment Reporting Information [Line Items]
Operating revenues									2,195	2,292	2,318
Other [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues									2,317	2,487	2,538
Income from operations									(203)	(66)	(68)
Depreciation and amortization									75	91	103
Capital Expenditures									118	72	93
Total Assets	$ 1,648				$ 1,571				1,648	1,571	1,785
Other [Member] | Intercompany Operating Revenues [Member]
Segment Reporting Information [Line Items]
Operating revenues									$ (122)	$ (195)	$ (220)