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Fair Value Measurements - Measured on a Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Assets      
Mortgage loans held for sale $ 1,539 $ 927  
Liabilities      
Mortgage servicing rights financing 33 29  
Treasury futures      
Assets      
Fair Value     $ 20
Recurring Fair Value Measurements      
Assets      
Mortgage loans held for sale 1,539 927  
Mortgage servicing rights 10,352 9,090  
Equity investments 9 9  
Liabilities      
Mortgage servicing rights financing 33 29  
Excess spread financing 406 437  
Recurring Fair Value Measurements | IRLCs      
Assets      
Fair Value 31 21  
Recurring Fair Value Measurements | LPCs      
Assets      
Fair Value 2 3  
Fair Value 2    
Recurring Fair Value Measurements | Forward MBS trades      
Assets      
Fair Value 7 22  
Fair Value 8 9  
Recurring Fair Value Measurements | Treasury futures      
Assets      
Fair Value 62 113  
Fair Value 3    
Recurring Fair Value Measurements | Level 1      
Assets      
Mortgage loans held for sale 0 0  
Mortgage servicing rights 0 0  
Equity investments 1 1  
Liabilities      
Mortgage servicing rights financing 0 0  
Excess spread financing 0 0  
Recurring Fair Value Measurements | Level 1 | IRLCs      
Assets      
Fair Value 0 0  
Recurring Fair Value Measurements | Level 1 | LPCs      
Assets      
Fair Value 0 0  
Fair Value 0    
Recurring Fair Value Measurements | Level 1 | Forward MBS trades      
Assets      
Fair Value 0 0  
Fair Value 0 0  
Recurring Fair Value Measurements | Level 1 | Treasury futures      
Assets      
Fair Value 0 0  
Fair Value 0    
Recurring Fair Value Measurements | Level 2      
Assets      
Mortgage loans held for sale 1,449 846  
Mortgage servicing rights 0 0  
Equity investments 0 0  
Liabilities      
Mortgage servicing rights financing 0 0  
Excess spread financing 0 0  
Recurring Fair Value Measurements | Level 2 | IRLCs      
Assets      
Fair Value 0 0  
Recurring Fair Value Measurements | Level 2 | LPCs      
Assets      
Fair Value 0 0  
Fair Value 0    
Recurring Fair Value Measurements | Level 2 | Forward MBS trades      
Assets      
Fair Value 7 22  
Fair Value 8 9  
Recurring Fair Value Measurements | Level 2 | Treasury futures      
Assets      
Fair Value 62 113  
Fair Value 3    
Recurring Fair Value Measurements | Level 3      
Assets      
Mortgage loans held for sale 90 81  
Mortgage servicing rights 10,352 9,090  
Equity investments 8 8  
Liabilities      
Mortgage servicing rights financing 33 29  
Excess spread financing 406 437  
Recurring Fair Value Measurements | Level 3 | IRLCs      
Assets      
Fair Value 31 21  
Recurring Fair Value Measurements | Level 3 | LPCs      
Assets      
Fair Value 2 3  
Fair Value 2    
Recurring Fair Value Measurements | Level 3 | Forward MBS trades      
Assets      
Fair Value 0 0  
Fair Value 0 0  
Recurring Fair Value Measurements | Level 3 | Treasury futures      
Assets      
Fair Value 0 $ 0  
Fair Value $ 0