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Basis of Presentation Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Other Significant Noncash Transactions [Line Items]    
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability $ 3 $ 1
Title Insurance Underwriter Joint Venture | Realogy Title Group    
Other Significant Noncash Transactions [Line Items]    
Noncash or Part Noncash Acquisition, Investments Acquired $ 90  
Equity Method Investment, Ownership Percentage 30.00%