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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Mortgage Securitizations (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Mortgage securitizations - U.S. agency sponsored      
Cash Flows Between Transferor and Transferee      
Principal securitized $ 2,000,000,000.0 $ 1,000,000,000.0  
Proceeds from new securitizations 2,100,000,000 1,000,000,000.0  
Gains recognized on the securitization 3,000,000 $ 0  
Carrying value of retained interests $ 349,000,000   $ 491,000,000
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 2 months 12 days 6 years 1 month 6 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Weighted average life (in years) 4 years 7 months 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 $ (9,000,000)   $ (18,000,000)
Carrying value of retained interests, impact of 20% adverse change in discount rate (17,000,000)   (35,000,000)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (23,000,000)   (18,000,000)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate $ (43,000,000)   $ (35,000,000)
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      
Weighted average discount rate (as a percent) 8.50% 6.60%  
Weighted average constant prepayment rate (as a percent) 25.70% 14.10%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Weighted average discount rate (as a percent) 6.20%   9.30%
Weighted average constant prepayment rate (as a percent) 20.60%   12.90%
Mortgage securitizations - Non-agency-sponsored      
Cash Flows Between Transferor and Transferee      
Principal securitized $ 1,600,000,000 $ 2,700,000,000  
Proceeds from new securitizations 2,500,000,000 2,700,000,000  
Gains recognized on the securitization 39,000,000 $ 17,000,000  
Senior interests      
Cash Flows Between Transferor and Transferee      
Carrying value of retained interests $ 902,000,000   $ 748,000,000
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables      
Weighted average life (in years) 4 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 9 months 18 days   3 years
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)   $ 0
Carrying value of retained interests, impact of 20% adverse change in discount rate (1,000,000)   (1,000,000)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate 0   0
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate 0   0
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses 0   0
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses $ 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      
Weighted average discount rate (as a percent) 1.30% 3.60%  
Weighted average constant prepayment rate (as a percent) 0.00% 6.00%  
Weighted average anticipated net credit losses (as a percent) 1.60% 5.00%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Weighted average discount rate (as a percent) 8.90%   3.60%
Weighted average constant prepayment rate (as a percent) 2.70%   10.50%
Weighted average anticipated net credit losses (as a percent) 1.10%   3.90%
Subordinated interests      
Cash Flows Between Transferor and Transferee      
Carrying value of retained interests $ 101,000,000   $ 102,000,000
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables      
Weighted average life (in years)   19 years 4 months 24 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Weighted average life (in years)     11 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 (1,000,000)   $ (1,000,000)
Carrying value of retained interests, impact of 20% adverse change in discount rate (2,000,000)   (1,000,000)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate 0   0
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate 0   0
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses 0   0
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses $ (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      
Weighted average discount rate (as a percent) 0.00% 7.10%  
Weighted average constant prepayment rate (as a percent) 0.00% 6.00%  
Weighted average anticipated net credit losses (as a percent) 0.00% 3.50%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Weighted average discount rate (as a percent) 4.40%   4.60%
Weighted average constant prepayment rate (as a percent) 5.10%   7.60%
Weighted average anticipated net credit losses (as a percent) 1.40%   2.80%
Personal loan      
Cash Flows Between Transferor and Transferee      
Proceeds from new securitizations $ 200,000,000    
Carrying value of retained interests $ 127,000,000