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Revenue (Disaggregation of Revenue from Contracts with Customers) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation of Revenue [Line Items]        
Reportable segment revenues $ 645 $ 617 $ 1,096 $ 1,043
Renewals [Member]        
Disaggregation of Revenue [Line Items]        
Reportable segment revenues 479 461 830 794
Real Estate [Member]        
Disaggregation of Revenue [Line Items]        
Reportable segment revenues [1] 45 44 73 71
Direct-To-Consumer [Member]        
Disaggregation of Revenue [Line Items]        
Reportable segment revenues [1] 55 56 85 88
Non-Warranty and Other [Member]        
Disaggregation of Revenue [Line Items]        
Reportable segment revenues $ 67 $ 56 $ 108 $ 90
[1] First-year revenue only.