Revenues (Disaggregation Of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 512	$ 465	$ 1,502	$ 1,378
Residential Pest Control [Member]
Disaggregation of Revenue [Line Items]
Revenues	193	183	534	519
Commercial Pest Control [Member]
Disaggregation of Revenue [Line Items]
Revenues	119	110	332	309
Termite and Home Services [Member]
Disaggregation of Revenue [Line Items]
Revenues	151	144	502	483
Sales of Products and Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	28	24	78	64
European Pest Control [Member]
Disaggregation of Revenue [Line Items]
Revenues	21	4	56	4
Terminix [Member]
Disaggregation of Revenue [Line Items]
Revenues	491	461	1,446	1,375
Terminix [Member] | Residential Pest Control [Member]
Disaggregation of Revenue [Line Items]
Revenues	193	183	534	519
Terminix [Member] | Commercial Pest Control [Member]
Disaggregation of Revenue [Line Items]
Revenues	119	110	332	309
Terminix [Member] | Termite and Home Services [Member]
Disaggregation of Revenue [Line Items]
Revenues	151	144	502	483
Terminix [Member] | Sales of Products and Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	28	24	78	64
European Pest Control And Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	21	4	56	4
European Pest Control And Other [Member] | European Pest Control [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 21	$ 4	$ 56	$ 4