Revenue (Disaggregation of Revenue from Contracts with Customers) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Reportable segment revenues		$ 487	$ 462	$ 838	$ 791
Renewals [Member]
Disaggregation of Revenue [Line Items]
Reportable segment revenues		347	316	593	539
Real Estate [Member]
Disaggregation of Revenue [Line Items]
Reportable segment revenues	[1]	57	77	102	134
Direct-To-Consumer [Member]
Disaggregation of Revenue [Line Items]
Reportable segment revenues	[1]	66	57	112	98
Revenue, Other [Member]
Disaggregation of Revenue [Line Items]
Reportable segment revenues		$ 18	$ 13	$ 31	$ 20

[1] First-year revenue only.