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Nature of Business and Basis of Presentation - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 01, 2021
Oct. 22, 2021
Aug. 31, 2021
Mar. 12, 2021
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Title Business          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Disposal Group, Including Discontinued Operation, Cash         $ 450
Disposal Group, Including Discontinued Operation, Consideration         $ 500
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal $ 487        
Disposal Group, Not Discontinued Operation, Transaction Cost 7        
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Title Business | Blend Labs, Inc. | Mr. Cooper Group Inc.          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners         9.90%
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Valuations Business          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Disposal Group, Including Discontinued Operation, Cash       $ 9  
Disposal Group, Including Discontinued Operation, Consideration       16  
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal 7        
Disposal Group, Not Discontinued Operation, Transaction Cost 0        
Disposal Group, Including Discontinued Operation, Consideration, Common Stock       $ 7  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Valuations Business | Cyprexx Services LLC | Mr. Cooper Group Inc.          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     10.00%    
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Field Services Business          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Disposal Group, Including Discontinued Operation, Cash     $ 36    
Disposal Group, Including Discontinued Operation, Consideration     $ 41    
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal 34        
Disposal Group, Not Discontinued Operation, Transaction Cost $ 0        
Discontinued Operations, Held-for-sale or Disposed of by Sale | Champion Mortgage          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Disposal Group, Including Discontinued Operation, Consideration   $ 1,640