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Revenue (Disaggregation of Revenue from Contracts with Customers) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disaggregation of Revenue [Line Items]        
Reportable segment revenues $ 523 $ 487 $ 890 $ 838
Renewals [Member]        
Disaggregation of Revenue [Line Items]        
Reportable segment revenues 398 347 677 593
Real Estate [Member]        
Disaggregation of Revenue [Line Items]        
Reportable segment revenues 42 57 75 102
Direct-To-Consumer [Member]        
Disaggregation of Revenue [Line Items]        
Reportable segment revenues 58 66 103 112
Revenue, Other [Member]        
Disaggregation of Revenue [Line Items]        
Reportable segment revenues $ 24 $ 18 $ 35 $ 31