Restructuring And Other Charges (Narrative) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		$ 15	$ 17	$ 21
Restructuring charges, net of tax		11	13	15
Professional fees		2	0	0
Professional fees, net of tax		2
Terminix [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	[1]	$ 5	$ 2	$ 2

[1] For the years ended December 31, 2019, 2018 and 2017, these charges include $5 million, $2 million and $2 million, respectively, of lease termination and severance costs. Of this amount, $1 million was unpaid and accrued as of December 31, 2019.