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Mortgage Servicing Rights ("MSRs") and Related Liabilities - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Servicing Asset at Amortized Cost [Line Items]          
Mortgage servicing liabilities - amortized cost $ 80,000,000   $ 80,000,000   $ 71,000,000
Accretion of MSL 11,000,000   29,000,000    
Mortgage servicing rights at fair value 3,505,000,000   3,505,000,000   3,665,000,000
Clean up call option     21,000,000    
Cumulative incurred losses related to advances and other receivables associated with inactive and liquidated loans 17,000,000 $ 22,000,000 28,000,000 $ 34,000,000  
Servicing fee income accretion expense 59,000,000 37,000,000 95,000,000 67,000,000  
Forward MSRs Sold          
Servicing Asset at Amortized Cost [Line Items]          
UPB 22,932,000,000 1,203,000,000 22,932,000,000 1,203,000,000  
Forward MSRs Sold, Subservicing Retained          
Servicing Asset at Amortized Cost [Line Items]          
UPB 20,560,000,000 $ 1,000,000 20,560,000,000 1,000,000  
Reverse Mortgage Servicing Rights          
Servicing Asset at Amortized Cost [Line Items]          
UPB 25,569,000,000   25,569,000,000   28,415,000,000
Amortization of mortgage servicing rights     1,000,000    
Other MSR adjustments     6,000,000 4,000,000  
Mortgage servicing rights at fair value 7,000,000   7,000,000   11,000,000
Mortgage servicing rights          
Servicing Asset at Amortized Cost [Line Items]          
UPB 316,012,000,000   316,012,000,000   295,481,000,000
Mortgage servicing liabilities - amortized cost 80,000,000   80,000,000   71,000,000
Accretion of MSL     28,000,000 11,000,000  
Other adjustments of MSL     37,000,000 $ 3,000,000  
Mortgage servicing right at amortized cost 6,000,000   6,000,000   11,000,000
Mortgage servicing rights at fair value 3,505,000,000   3,505,000,000   3,665,000,000
Fair value of MSL 44,000,000   44,000,000   $ 53,000,000
Impairment     $ 0    
Cumulative incurred losses related to advances and other receivables associated with inactive and liquidated loans $ 17,000,000