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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
U.S. government-sponsored agency guaranteed          
Cash Flows Between Transferor and Transferee          
Proceeds from new securitizations $ 6,800 $ 6,300 $ 19,800 $ 19,600  
Contractual servicing fees received 100 100 400 300  
Cash flows received on retained interests and other net cash flows 0 0 0 0  
Gains recognized on the securitization 25 $ 26 115 $ 59  
Sensitivity analysis of fair value of interests continued to be held by transferor          
Carrying value of retained interests 2,584   2,584   $ 2,374
Carrying value of retained interests, impact of 10% adverse change in discount rate (62)   (62)   (69)
Carrying value of retained interests, impact of 20% adverse change in discount rate (122)   (122)   (134)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (105)   (105)   (93)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate $ (202)   $ (202)   $ (179)
U.S. government-sponsored agency guaranteed | Low end of range          
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables          
Discount rate 3.00% 0.00% 0.00% 0.00%  
Constant prepayment rate 8.40% 4.60% 5.70% 0.00%  
Weighted average life 6 years 6 months 5 years 2 months 3 years 6 months 0 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate     0.00%   0.00%
Constant prepayment rate     6.80%   6.00%
Weighted average life     1 year 7 months   0 years
U.S. government-sponsored agency guaranteed | High end of range          
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables          
Discount rate 10.70% 14.70% 10.70% 14.70%  
Constant prepayment rate 14.10% 18.10% 34.90% 18.10%  
Weighted average life 9 years 4 months 8 years 10 months 15 days 10 years 1 month 6 days 9 years 8 months 12 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate     30.50%   21.20%
Constant prepayment rate     28.60%   41.40%
Weighted average life     20 years 8 months   16 years
U.S. government-sponsored agency guaranteed | Weighted Average          
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables          
Discount rate 9.10% 12.40% 7.70% 11.20%  
Constant prepayment rate 11.10% 5.80% 12.70% 5.30%  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate     6.00%   8.40%
Constant prepayment rate     14.40%   15.30%
Mortgage securitizations - Non-agency-sponsored          
Cash Flows Between Transferor and Transferee          
Proceeds from new securitizations $ 3,100 $ 1,700 $ 9,200 $ 6,900  
Contractual servicing fees received 0 0 0 0  
Cash flows received on retained interests and other net cash flows 0 0 0 0  
Gains recognized on the securitization $ 7 $ 9 $ 38 $ 38  
Senior interests          
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables          
Discount rate 3.20%        
Constant prepayment rate     0.00% 0.00%  
Anticipated net credit losses 40.00%   40.00% 40.00%  
Sensitivity analysis of fair value of interests continued to be held by transferor          
Carrying value of retained interests $ 192   $ 192   $ 310
Carrying value of retained interests, impact of 10% adverse change in discount rate (8)   (8)   (7)
Carrying value of retained interests, impact of 20% adverse change in discount rate (15)   (15)   (13)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (3)   (3)   (3)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate (6)   (6)   (5)
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses (6)   (6)   (6)
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses $ (11)   $ (11)   $ (10)
Senior interests | Low end of range          
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables          
Discount rate     2.80% 1.40%  
Weighted average life 9 years 9 months   9 years 8 months 2 years 7 months 6 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate     1.10%   1.10%
Constant prepayment rate     2.90%   2.00%
Anticipated net credit losses     0.00%   0.00%
Weighted average life     3 months 18 days   3 months 18 days
Senior interests | High end of range          
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables          
Discount rate     3.20% 4.60%  
Weighted average life     9 years 9 months 8 years 7 months 6 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate     38.60%   47.10%
Constant prepayment rate     100.00%   100.00%
Anticipated net credit losses     88.70%   92.40%
Weighted average life     22 years 5 months   14 years 4 months 24 days
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 3.20%   2.90% 3.80%  
Constant prepayment rate     0.00% 0.00%  
Anticipated net credit losses 40.00%   40.00% 40.00%  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate     8.50%   7.70%
Constant prepayment rate     15.90%   10.90%
Anticipated net credit losses     44.90%   51.70%
Subordinated interests          
Sensitivity analysis of fair value of interests continued to be held by transferor          
Carrying value of retained interests $ 514   $ 514   $ 554
Carrying value of retained interests, impact of 10% adverse change in discount rate (24)   (24)   (30)
Carrying value of retained interests, impact of 20% adverse change in discount rate (46)   (46)   (57)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (6)   (6)   (9)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate (14)   (14)   (18)
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses (6)   (6)   (9)
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses (12)   $ (12)   $ (16)
Subordinated interests | Low end of range          
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables          
Discount rate   6.70% 0.00% 2.60%  
Constant prepayment rate   0.50% 0.00% 0.50%  
Anticipated net credit losses   8.90% 0.00% 8.90%  
Weighted average life   6 years 8 months 0 days 3 years  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate     2.00%   1.30%
Constant prepayment rate     0.50%   0.50%
Anticipated net credit losses     4.40%   13.70%
Weighted average life     1 month   0 years
Subordinated interests | High end of range          
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables          
Discount rate   9.00% 12.10% 9.10%  
Constant prepayment rate   8.90% 8.00% 8.90%  
Anticipated net credit losses   40.00% 55.90% 58.50%  
Weighted average life   7 years 3 months 12 years 10 months 24 days 14 years 6 months  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate     22.60%   19.60%
Constant prepayment rate     22.10%   16.20%
Anticipated net credit losses     89.40%   83.80%
Weighted average life     21 years 5 months   24 years 4 months 24 days
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   8.70% 5.50% 7.80%  
Constant prepayment rate   1.70% 3.30% 3.20%  
Anticipated net credit losses   35.60% 40.20% 43.10%  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate     7.70%   8.20%
Constant prepayment rate     7.30%   7.20%
Anticipated net credit losses     52.10%   52.50%
Asset-backed securities          
Cash Flows Between Transferor and Transferee          
Proceeds from new securitizations 400 $ 0 $ 400 $ 500  
Gains recognized on the securitization $ 10   $ 10