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Indebtedness - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Debt Instrument [Line Items]        
Interest Expense $ 111 $ 119 $ 217 $ 245
Advance Facilities | Servicing        
Debt Instrument [Line Items]        
Short-Term Debt, Weighted Average Interest Rate, over Time 3.10% 3.40% 2.80% 3.20%
Warehouse & MSR Facilities        
Debt Instrument [Line Items]        
Short-Term Debt, Weighted Average Interest Rate, over Time 3.10% 2.10% 2.60% 2.20%
Debt        
Debt Instrument [Line Items]        
Interest Expense $ 90 $ 90 $ 176 $ 183
Unsecured Senior Notes        
Debt Instrument [Line Items]        
Maximum percentage redeemable on unsecured debt     40.00%  
Repayments of debt     $ 0 0
Amount of principal amount outstanding repaid     $ 0 $ 0