Business Segment Reporting (Schedule Of Information For Continuing Operations For Each Reportable Segment And Other Operations And Headquarters) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenue		$ 512	$ 465	$ 1,502	$ 1,378
Reportable Segment Adjusted EBITDA		98	72	280	261
Terminix [Member]
Segment Reporting Information [Line Items]
Revenue		491	461	1,446	1,375
Terminix [Member] | Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue		491	461	1,446	1,375
Reportable Segment Adjusted EBITDA	[1]	98	72	280	261
European Pest Control And Other [Member]
Segment Reporting Information [Line Items]
Revenue		21	4	56	4
European Pest Control And Other [Member] | Operating Segment [Member]
Segment Reporting Information [Line Items]
Revenue		$ 21	$ 4	$ 56	$ 4

[1] Presented below is a reconciliation of Net Income to Reportable Segment Adjusted EBITDA