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Revenue (Disaggregation of Revenue from Contracts with Customers) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disaggregation of Revenue [Line Items]    
Reportable segment revenues $ 367 $ 351
Renewals [Member]    
Disaggregation of Revenue [Line Items]    
Reportable segment revenues 278 247
Real Estate [Member]    
Disaggregation of Revenue [Line Items]    
Reportable segment revenues 33 45
Direct-To-Consumer [Member]    
Disaggregation of Revenue [Line Items]    
Reportable segment revenues 44 46
Revenue, Other [Member]    
Disaggregation of Revenue [Line Items]    
Reportable segment revenues $ 11 $ 13