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Fair Value Measurements - Reconciliation of Level 3 (Details) - USD ($)
$ in Millions
5 Months Ended 7 Months Ended 12 Months Ended
Dec. 31, 2018
Jul. 31, 2018
Dec. 31, 2019
Excess spread financing      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance - beginning of period $ 1,039 $ 996 $ 1,184
Total gains or losses included in earnings 5 81 (169)
Payments received from borrowers 0   0
Purchases, issuances, sales, repayments and settlements      
Purchases 0 0 0
Issuances 255 70 542
Sales 0 0 0
Repayments (38) (3) (27)
Settlements (77) (105) (219)
Transfers to mortgage loans held for sale     0
Transfers to real estate owned     0
Changes in fair value 0    
Balance - end of period 1,184 1,039 1,311
Mortgage servicing rights financing      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance - beginning of period 26 10 32
Total gains or losses included in earnings 6 16 5
Payments received from borrowers 0   0
Purchases, issuances, sales, repayments and settlements      
Purchases 0 0 0
Issuances 0 0 0
Sales 0 0 0
Repayments 0 0 0
Settlements 0 0 0
Transfers to mortgage loans held for sale     0
Transfers to real estate owned     0
Changes in fair value 0    
Balance - end of period 32 26 37
Mortgage servicing rights      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance - beginning of period 3,413 2,937 3,665
Total gains or losses included in earnings (236) 166 (1,053)
Payments received from borrowers 0   0
Purchases, issuances, sales, repayments and settlements      
Purchases 479 144 858
Issuances 120 162 434
Sales (111) (4) (408)
Repayments 0 0 0
Settlements 0 0 0
Transfers to mortgage loans held for sale     0
Transfers to real estate owned     0
Changes in fair value 0    
Balance - end of period 3,665 3,413 3,496
Mortgage loans held for investment      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance - beginning of period 125   119
Total gains or losses included in earnings (1)    
Payments received from borrowers (5)   (11)
Purchases, issuances, sales, repayments and settlements      
Purchases 0   0
Issuances 0   0
Sales 0   (94)
Repayments 0   0
Settlements 0   0
Transfers to mortgage loans held for sale     (12)
Transfers to real estate owned     (5)
Changes in fair value 2    
Balance - end of period $ 119 $ 125 $ 0