Discontinued Operations (Schedule Of Assets And Liabilities Of Discontinued Operations) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Discontinued Operations [Abstract]
Receivables, less allowances of $3 and $3, respectively	$ 43	$ 40
Inventories	2	2
Prepaid expenses and other assets	4	3
Total Current Assets	49	45
Property and equipment, net	8	8
Operating lease right-of-use assets	2	2
Goodwill	178	183
Intangible assets, primarily trade names, service marks and trademarks, net	626	622
Notes receivable	12	13
Deferred customer acquisition costs	1	1
Other assets	1	1
Total Assets	877	875
Accounts payable	8	8
Payroll and related expenses	2	5
Other	24	23
Deferred revenue	3	4
Current portion of lease liability	1	1
Total Current Liabilities	38	40
Deferred taxes	2	1
Other long-term obligations, primarily self-insured claims	6	6
Long-term lease liability	2	2
Total Liabilities	48	50
Receivables, allowances	$ 3	$ 3