Discontinued Operations (Schedule Of Assets And Liabilities Of Discontinued Operations) (Details) - Discontinued Operations, Held-for-sale [Member] - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Details of assets and liabilities and operating results of discontinued operations
Receivables, less allowances of $5 and $3, respectively	$ 47	$ 40
Inventories	6	2
Prepaid expenses and other assets	3	3
Total Current Assets	56	45
Property and equipment, net	12	8
Operating lease right-of-use assets	2	2
Goodwill	180	183
Intangible assets, primarily trade names, service marks and trademarks, net	626	622
Notes receivable	11	13
Deferred customer acquisition costs	1	1
Other assets	4	5
Total Assets	892	879
Accounts payable	11	8
Payroll and related expenses	4	5
Other	30	23
Deferred revenue	4	4
Current portion of lease liability	1	1
Current portion of long-term debt	2	1
Total Current Liabilities	51	42
Long-Term Debt	1	2
Deferred taxes	2	1
Other long-term obligations	6	6
Long-term lease liability	1	2
Total Liabilities	62	52
Receivables, allowances	$ 5	$ 3