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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Mortgage Securitizations (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Mortgage securitizations - U.S. agency sponsored          
Cash Flows Between Transferor and Transferee          
Principal securitized $ 500 $ 2,700 $ 5,400 $ 7,200  
Proceeds from new securitizations 500 2,900 5,600 7,600  
Contractual servicing fees received     100 100  
Purchases of previously transferred financial assets 0 200 100 300  
Gains recognized on the securitization 2 $ 83 3 $ 87  
Carrying value of retained interests $ 379   $ 379   $ 315
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables          
Weighted average life (in years) 7 years 4 months 24 days 4 years 2 months 12 days 7 years 7 months 6 days 4 years 6 months  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Weighted average life (in years)     5 years 8 months 12 days   4 years 6 months
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)   $ (9)   $ (8)
Carrying value of retained interests, impact of 20% adverse change in discount rate (18)   (18)   (15)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (18)   (18)   (21)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate $ (35)   $ (35)   $ (40)
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) 8.60% 3.50% 8.80% 5.20%  
Weighted average constant prepayment rate (as a percent) 5.90% 29.70% 5.30% 27.90%  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Weighted average discount rate (as a percent)     6.40%   5.90%
Weighted average constant prepayment rate (as a percent)     11.30%   22.70%
Mortgage securitizations - Non-agency-sponsored          
Cash Flows Between Transferor and Transferee          
Principal securitized $ 1,700 $ 2,900 $ 19,800 $ 5,400  
Proceeds from new securitizations 1,900 4,500 19,700 7,900  
Contractual servicing fees received     0 0  
Purchases of previously transferred financial assets 0 0 0 0  
Gains recognized on the securitization 121 $ 51 423 $ 116  
Senior interests          
Cash Flows Between Transferor and Transferee          
Carrying value of retained interests $ 1,777   $ 1,777   $ 1,210
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 3 years 10 months 24 days 3 years 4 months 24 days 4 years 2 months 12 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Weighted average life (in years)     12 years 7 months 6 days   5 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 $ 0   $ 0   $ 0
Carrying value of retained interests, impact of 20% adverse change in discount rate (1)   (1)   (1)
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          
Weighted average discount rate (as a percent) 2.20% 1.80% 2.20% 1.80%  
Weighted average constant prepayment rate (as a percent) 4.30% 2.50% 6.30% 1.80%  
Weighted average anticipated net credit losses (as a percent) 0.80% 0.20% 1.40% 0.70%  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Weighted average discount rate (as a percent)     13.00%   7.20%
Weighted average constant prepayment rate (as a percent)     6.00%   5.30%
Weighted average anticipated net credit losses (as a percent)         1.20%
Subordinated interests          
Cash Flows Between Transferor and Transferee          
Carrying value of retained interests $ 500   $ 500   $ 145
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 10 months 24 days   5 years 4 months 24 days 2 years 3 months 18 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Weighted average life (in years)     18 years 2 months 12 days   4 years 8 months 12 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   $ (1)
Carrying value of retained interests, impact of 20% adverse change in discount rate (1)   (1)   (1)
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          
Weighted average discount rate (as a percent) 2.40%   2.80% 3.00%  
Weighted average constant prepayment rate (as a percent) 13.30%   10.60% 25.00%  
Weighted average anticipated net credit losses (as a percent) 0.20%   1.00% 0.50%  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Weighted average discount rate (as a percent)     3.00%   4.30%
Weighted average constant prepayment rate (as a percent)     7.00%   4.70%
Weighted average anticipated net credit losses (as a percent)     1.50%   1.40%
Personal loan          
Cash Flows Between Transferor and Transferee          
Carrying value of retained interests $ 82   $ 82