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Business Combinations and Asset Acquisitions (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Jul. 31, 2023
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Aug. 01, 2023
Business Combination, Description [Abstract]                
Asset Acquisition, Consideration Transferred       $ 34        
Goodwill, Acquired During Period         $ 21      
Business Combination, Bargain Purchase, Gain Recognized, Amount         $ 96 $ 0 $ 0  
Business Combination, Bargain Purchase, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]         Other income (expense), net      
Corporate/Other(2)                
Business Combination, Description [Abstract]                
Goodwill, Acquired During Period         $ 16      
Servicing                
Business Combination, Description [Abstract]                
Goodwill, Acquired During Period         $ 5      
Home Point Capital Inc                
Business Combination, Description [Abstract]                
Business Combination, Bargain Purchase, Gain Recognized, Description         The Company believes it was able to negotiate a bargain purchase price due to seller’s operational challenges from significant market volatility, as well as the seller’s desire to exit the business in an expedited manner.      
Business Combination, Consideration Transferred     $ 658          
Acquisition costs         $ 7      
Business Combination, Consideration Transferred for MSRs     335          
Business Combination, Consideration Transferred for Tender Offer     $ 323          
Price per share (in dollars per share)               $ 2.33
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Senior Note               $ 500
Mortgage servicing rights acquired               $ 1,200
Home Point Capital Inc | Corporate/Other(2)                
Business Combination, Description [Abstract]                
Business Combination, Bargain Purchase, Gain Recognized, Amount         96      
Roosevelt [Member]                
Business Combination, Description [Abstract]                
Business Combination, Consideration Transferred $ 28              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 4              
Goodwill, Acquired During Period   $ 21            
Acquisition costs         13      
Roosevelt [Member] | Corporate/Other(2)                
Business Combination, Description [Abstract]                
Goodwill, Acquired During Period         16      
Roosevelt [Member] | Servicing                
Business Combination, Description [Abstract]                
Goodwill, Acquired During Period         $ 5