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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Mortgage Securitizations (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Mortgage securitizations - U.S. agency sponsored          
Cash Flows Between Transferor and Transferee          
Principal securitized $ 1,100 $ 1,000 $ 2,100 $ 2,200  
Proceeds from new securitizations 1,200 1,100 2,200 2,300  
Purchases of previously transferred financial assets 100 100 100 200  
Gains recognized on the securitization 5 $ 6 5 $ 11  
Carrying value of retained interests $ 487   $ 487   $ 564
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 10 months 24 days 7 years 8 months 12 days 6 years 7 years 8 months 12 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Weighted average life (in years)     5 years 9 months 18 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 $ (14)   $ (14)   $ (16)
Carrying value of retained interests, impact of 20% adverse change in discount rate (27)   (27)   (32)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (23)   (23)   (21)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate $ (45)   $ (45)   $ (41)
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) 7.40% 9.40% 7.00% 9.90%  
Constant prepayment rate (as a percent) 15.70% 5.70% 14.80% 5.10%  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     8.00%   7.80%
Constant prepayment rate (as a percent)     13.10%   9.10%
Mortgage securitizations - Non-agency-sponsored          
Cash Flows Between Transferor and Transferee          
Principal securitized $ 6,100 $ 1,000 $ 8,800 $ 1,000  
Proceeds from new securitizations 6,100 1,000 8,800 2,600  
Purchases of previously transferred financial assets 0 0 0 0  
Gains recognized on the securitization 26 $ 7 43 $ 18  
Senior interests          
Cash Flows Between Transferor and Transferee          
Carrying value of retained interests $ 804   $ 804   $ 300
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables          
Weighted average life (in years) 3 years 2 months 12 days 6 years 8 months 12 days 6 years 7 months 6 days 6 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 10 months 24 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)   (1)   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) 3.20% 3.80% 3.50% 3.60%  
Constant prepayment rate (as a percent) 5.70% 8.00% 5.80% 9.80%  
Anticipated net credit losses (as a percent) 3.00% 4.60% 4.40% 4.90%  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     7.50%   9.30%
Constant prepayment rate (as a percent)     3.10%   8.00%
Anticipated net credit losses (as a percent)     9.00%   40.00%
Subordinated interests          
Cash Flows Between Transferor and Transferee          
Carrying value of retained interests $ 63   $ 63   $ 51
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables          
Weighted average life (in years) 15 years 7 months 6 days 3 years 4 months 24 days 16 years 1 month 6 days 3 years  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Weighted average life (in years)     24 years 3 months 18 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)   $ (1)   0
Carrying value of retained interests, impact of 20% adverse change in discount rate (1)   (1)   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
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) 5.30% 3.50% 5.50% 3.20%  
Constant prepayment rate (as a percent) 5.90% 8.00% 5.90% 9.90%  
Anticipated net credit losses (as a percent) 3.70% 4.60% 3.70% 3.30%  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     4.90%   0.00%
Constant prepayment rate (as a percent)     4.20%   0.00%
Anticipated net credit losses (as a percent)     0.00%   0.00%
Personal loan          
Cash Flows Between Transferor and Transferee          
Proceeds from new securitizations     $ 200    
Carrying value of retained interests $ 168   $ 168