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Fair Value Measurements - Measured on a Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Assets      
Mortgage loans held for sale $ 937 $ 893  
Liabilities      
Mortgage servicing rights financing 21 19  
Treasury futures      
Assets      
Fair Value     $ 49
Recurring Fair Value Measurements      
Assets      
Mortgage loans held for sale 937 893  
Mortgage servicing rights 6,566 6,654  
Equity investments 44 47  
Liabilities      
Mortgage servicing rights financing 21 19  
Excess spread financing 491 509  
Recurring Fair Value Measurements | IRLCs      
Assets      
Fair Value 33 22  
Recurring Fair Value Measurements | LPCs      
Assets      
Fair Value 3 1  
Fair Value   1  
Recurring Fair Value Measurements | Forward MBS trades      
Assets      
Fair Value 18 8  
Fair Value 10 9  
Recurring Fair Value Measurements | Treasury futures      
Assets      
Fair Value 71    
Fair Value 1 14  
Recurring Fair Value Measurements | Level 1      
Assets      
Mortgage loans held for sale 0 0  
Mortgage servicing rights 0 0  
Equity investments 2 2  
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    
Fair Value 0 0  
Recurring Fair Value Measurements | Level 2      
Assets      
Mortgage loans held for sale 866 819  
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 18 8  
Fair Value 10 9  
Recurring Fair Value Measurements | Level 2 | Treasury futures      
Assets      
Fair Value 71    
Fair Value 1 14  
Recurring Fair Value Measurements | Level 3      
Assets      
Mortgage loans held for sale 71 74  
Mortgage servicing rights 6,566 6,654  
Equity investments 42 45  
Liabilities      
Mortgage servicing rights financing 21 19  
Excess spread financing 491 509  
Recurring Fair Value Measurements | Level 3 | IRLCs      
Assets      
Fair Value 33 22  
Recurring Fair Value Measurements | Level 3 | LPCs      
Assets      
Fair Value 3 1  
Fair Value   1  
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    
Fair Value $ 0 $ 0