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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Mortgage Securitizations (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Mortgage securitizations - U.S. agency sponsored          
Cash Flows Between Transferor and Transferee          
Principal securitized $ 1,700,000,000 $ 1,000,000,000.0 $ 3,800,000,000 $ 3,200,000,000  
Proceeds from new securitizations 1,700,000,000 1,100,000,000 3,900,000,000 3,400,000,000  
Purchases of previously transferred financial assets 0 100,000,000 100,000,000 300,000,000  
Gains recognized on the securitization 9,000,000 $ 4,000,000 14,000,000 $ 15,000,000  
Carrying value of retained interests $ 461,000,000   $ 461,000,000   $ 564,000,000
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables          
Weighted average life (in years) 6 years 7 months 6 days 7 years 2 months 12 days 6 years 2 months 12 days 7 years 7 months 6 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Weighted average life (in years)     6 years 2 months 12 days   6 years 4 months 24 days
Sensitivity analysis of fair value of interests continued to be held by transferor          
Carrying value of retained interests, impact of 10% adverse change in discount rate $ (16,000,000)   $ (16,000,000)   $ (16,000,000)
Carrying value of retained interests, impact of 20% adverse change in discount rate (31,000,000)   (31,000,000)   (32,000,000)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (19,000,000)   (19,000,000)   (21,000,000)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate $ (36,000,000)   $ (36,000,000)   $ (41,000,000)
Mortgage securitizations - U.S. agency sponsored | Weighted Average          
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables          
Discount rate (as a percent) 11.40% 10.00% 8.40% 9.90%  
Constant prepayment rate (as a percent) 14.60% 6.20% 14.80% 5.50%  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     10.20%   7.80%
Constant prepayment rate (as a percent)     11.20%   9.10%
Mortgage securitizations - Non-agency-sponsored          
Cash Flows Between Transferor and Transferee          
Principal securitized $ 3,800,000,000 $ 700,000,000 $ 12,600,000,000 $ 1,700,000,000  
Proceeds from new securitizations 4,000,000,000.0 700,000,000 12,800,000,000 3,300,000,000  
Purchases of previously transferred financial assets 0 0 0 0  
Gains recognized on the securitization 16,000,000 $ 0 59,000,000 $ 18,000,000  
Senior interests          
Cash Flows Between Transferor and Transferee          
Carrying value of retained interests $ 812,000,000   $ 812,000,000   $ 300,000,000
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables          
Weighted average life (in years) 5 years 4 months 24 days 3 years 7 months 6 days 6 years 1 month 6 days 5 years 9 months 18 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Weighted average life (in years)     7 years 1 month 6 days   6 years 7 months 6 days
Sensitivity analysis of fair value of interests continued to be held by transferor          
Carrying value of retained interests, impact of 10% adverse change in discount rate $ 0   $ 0   $ 0
Carrying value of retained interests, impact of 20% adverse change in discount rate (1,000,000)   (1,000,000)   0
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate 0   0   0
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate 0   0   0
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses 0   0   0
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses $ 0   $ 0   $ 0
Senior interests | Weighted Average          
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables          
Discount rate (as a percent) 3.70% 4.10% 3.60% 3.70%  
Constant prepayment rate (as a percent) 17.60% 7.90% 11.30% 8.80%  
Anticipated net credit losses (as a percent) 2.60% 3.60% 3.60% 4.40%  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     6.60%   9.30%
Constant prepayment rate (as a percent)     2.40%   8.00%
Anticipated net credit losses (as a percent)     6.20%   40.00%
Subordinated interests          
Cash Flows Between Transferor and Transferee          
Carrying value of retained interests $ 99,000,000   $ 99,000,000   $ 51,000,000
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables          
Weighted average life (in years) 11 years 11 years 4 months 24 days 12 years 6 years 8 months 12 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Weighted average life (in years)     26 years 7 months 6 days    
Sensitivity analysis of fair value of interests continued to be held by transferor          
Carrying value of retained interests, impact of 10% adverse change in discount rate $ (1,000,000)   $ (1,000,000)   0
Carrying value of retained interests, impact of 20% adverse change in discount rate (1,000,000)   (1,000,000)   0
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate 0   0   0
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate 0   0   0
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses 0   0   0
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses $ (1,000,000)   $ (1,000,000)   $ 0
Subordinated interests | Weighted Average          
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables          
Discount rate (as a percent) 4.00% 5.60% 4.30% 4.40%  
Constant prepayment rate (as a percent) 8.40% 8.20% 7.80% 9.10%  
Anticipated net credit losses (as a percent) 2.70% 3.60% 2.80% 3.40%  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     7.80%   0.00%
Constant prepayment rate (as a percent)     5.60%   0.00%
Anticipated net credit losses (as a percent)     2.50%   0.00%
Personal loan          
Cash Flows Between Transferor and Transferee          
Proceeds from new securitizations     $ 200,000,000    
Carrying value of retained interests $ 150,000,000   $ 150,000,000