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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Mortgage securitizations - U.S. agency sponsored          
Cash Flows Between Transferor and Transferee          
Principal securitized $ 1,400 $ 500 $ 5,400 $ 5,400  
Proceeds from new securitizations 1,400 500 5,200 5,600  
Contractual servicing fees received 0 0 100 100  
Cash flows received on retained interests and other new cash flows 0 0 0 0  
Purchases of previously transferred financial assets 0 0 100 100  
Gains recognized on the securitization 1 $ 2 1 $ 3  
Carrying value of retained interests $ 647   $ 647   $ 374
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables          
Weighted average life (in years) 9 years 4 months 24 days 7 years 4 months 24 days 9 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)     8 years 2 months 12 days   5 years 1 month 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 $ (21)   $ (21)   $ (6)
Carrying value of retained interests, impact of 20% adverse change in discount rate (40)   (40)   (11)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (12)   (12)   (19)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate $ (24)   $ (24)   $ (37)
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) 9.60% 8.60% 8.20% 8.80%  
Weighted average constant prepayment rate (as a percent) 2.60% 5.90% 2.60% 5.30%  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Weighted average discount rate (as a percent)     5.90%   3.70%
Weighted average constant prepayment rate (as a percent)     4.80%   14.50%
Mortgage securitizations - Non-agency-sponsored          
Cash Flows Between Transferor and Transferee          
Principal securitized $ 1,100 $ 1,700 $ 11,300 $ 19,800  
Proceeds from new securitizations 1,000 1,900 11,000 19,700  
Contractual servicing fees received 0 0 0 0  
Cash flows received on retained interests and other new cash flows 0 0 100 0  
Purchases of previously transferred financial assets 0 0 0 0  
Gains recognized on the securitization 21 $ 121 94 $ 423  
Senior interests          
Cash Flows Between Transferor and Transferee          
Carrying value of retained interests 1,069   $ 1,069   $ 1,452
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 6 months 3 years 4 months 24 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Weighted average life (in years)     1 year 6 months   8 years 9 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   $ (1)
Carrying value of retained interests, impact of 20% adverse change in discount rate 0   0   (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% 3.40% 2.20%  
Weighted average constant prepayment rate (as a percent)   4.30% 5.90% 6.30%  
Weighted average anticipated net credit losses (as a percent)   0.80% 2.90% 1.40%  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Weighted average discount rate (as a percent)     1.50%   16.20%
Weighted average constant prepayment rate (as a percent)     15.00%   6.80%
Weighted average anticipated net credit losses (as a percent)     1.00%   1.00%
Subordinated interests          
Cash Flows Between Transferor and Transferee          
Carrying value of retained interests $ 945   $ 945   $ 955
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 3 months 18 days 4 years 10 months 24 days 5 years 8 months 12 days 5 years 4 months 24 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Weighted average life (in years)         18 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 $ 0   $ 0   $ 0
Carrying value of retained interests, impact of 20% adverse change in discount rate 0   0   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          
Weighted average discount rate (as a percent) 5.70% 2.40% 4.20% 2.80%  
Weighted average constant prepayment rate (as a percent) 9.10% 13.30% 11.70% 10.60%  
Weighted average anticipated net credit losses (as a percent) 0.70% 0.20% 0.50% 1.00%  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Weighted average discount rate (as a percent)         4.00%
Weighted average constant prepayment rate (as a percent)         9.00%
Weighted average anticipated net credit losses (as a percent)         2.00%
Personal loan          
Cash Flows Between Transferor and Transferee          
Carrying value of retained interests $ 35   $ 35