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Revenue (Disaggregation Of Revenue From Contracts With Customers) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of Revenue [Line Items]        
Reportable segment revenues $ 440 $ 407 $ 1,151 $ 1,065
Renewals [Member]        
Disaggregation of Revenue [Line Items]        
Reportable segment revenues 303 278 792 722
Real Estate [Member]        
Disaggregation of Revenue [Line Items]        
Reportable segment revenues [1] 76 77 206 206
Direct-To-Consumer [Member]        
Disaggregation of Revenue [Line Items]        
Reportable segment revenues [1] 56 50 143 131
Service, Other [Member]        
Disaggregation of Revenue [Line Items]        
Reportable segment revenues $ 4 $ 2 $ 10 $ 6
[1] First-year revenue only.