Revenue (Disaggregation of Revenue from Contracts with Customers) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Reportable segment revenues		$ 484	$ 471	$ 1,322	$ 1,263
Renewals [Member]
Disaggregation of Revenue [Line Items]
Reportable segment revenues		356	328	949	867
Real Estate [Member]
Disaggregation of Revenue [Line Items]
Reportable segment revenues	[1]	51	73	153	207
Direct-To-Consumer [Member]
Disaggregation of Revenue [Line Items]
Reportable segment revenues	[1]	64	59	176	157
Revenue, Other [Member]
Disaggregation of Revenue [Line Items]
Reportable segment revenues		$ 13	$ 11	$ 44	$ 31

[1] First-year revenue only.