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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Personal Loan          
Cash Flows Between Transferor and Transferee          
Proceeds from new securitizations     $ 500    
U.S. government-sponsored agency guaranteed          
Cash Flows Between Transferor and Transferee          
Proceeds from new securitizations $ 11,700 $ 6,800 32,500 $ 19,800  
Contractual servicing fees received 100 $ 100 300 $ 400  
Sensitivity analysis of fair value of interests continued to be held by transferor          
Carrying value of retained interests 2,261   2,261   $ 3,546
Carrying value of retained interests, impact of 10% adverse change in discount rate (54)   (54)   (79)
Carrying value of retained interests, impact of 20% adverse change in discount rate (105)   (105)   (155)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (91)   (91)   (111)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate $ (189)   $ (189)   $ (213)
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 (as a percent) 1.50% 2.30% 0.80% 0.00%  
Constant prepayment rate (as a percent) 7.70% 8.40% 7.70% 5.70%  
Weighted average life (in years) 2 years 6 years 3 months 18 days 6 months 3 years 6 months  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     0.30%   0.00%
Constant prepayment rate (as a percent)     7.70%   5.70%
Weighted average life (in years)     3 months 18 days   1 year 3 months 18 days
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 (as a percent) 13.00% 10.70% 13.00% 10.70%  
Constant prepayment rate (as a percent) 30.90% 16.60% 30.90% 34.90%  
Weighted average life (in years) 9 years 9 months 18 days 9 years 3 months 18 days 17 years 6 months 12 years 9 months 18 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     31.30%   27.00%
Constant prepayment rate (as a percent)     36.00%   27.80%
Weighted average life (in years)     17 years 7 months 6 days   21 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 (as a percent) 10.00% 8.10% 9.10% 6.40%  
Constant prepayment rate (as a percent) 13.70% 11.80% 12.80% 12.60%  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     7.00%   4.90%
Constant prepayment rate (as a percent)     16.40%   12.30%
Mortgage securitizations - Non-agency-sponsored          
Cash Flows Between Transferor and Transferee          
Proceeds from new securitizations $ 1,400 $ 3,100 $ 8,000 $ 9,200  
Contractual servicing fees received $ 0 $ 0 $ 0 $ 0  
Senior interests          
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables          
Discount rate (as a percent) 0.00% 3.20% 0.00%    
Constant prepayment rate (as a percent) 0.00% 0.00% 0.00% 0.00%  
Anticipated net credit losses (as a percent)   40.00%   40.00%  
Sensitivity analysis of fair value of interests continued to be held by transferor          
Carrying value of retained interests $ 20   $ 20   $ 179
Carrying value of retained interests, impact of 10% adverse change in discount rate (6)   (6)   (8)
Carrying value of retained interests, impact of 20% adverse change in discount rate (12)   (12)   (15)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (1)   (1)   (3)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate (3)   (3)   (6)
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 $ (12)   $ (12)   $ (11)
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 (as a percent)       2.80%  
Weighted average life (in years)       9 years 8 months 12 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     4.80%   1.60%
Constant prepayment rate (as a percent)     4.20%   4.20%
Anticipated net credit losses (as a percent)     51.50%   0.20%
Weighted average life (in years)     6 years 6 months   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 (as a percent)       3.20%  
Weighted average life (in years)       9 years 9 months 18 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     7.80%   67.60%
Constant prepayment rate (as a percent)     9.80%   100.00%
Anticipated net credit losses (as a percent)     85.60%   89.10%
Weighted average life (in years)     16 years 10 months 24 days   18 years 1 month 6 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 (as a percent) 0.00% 3.20% 0.00% 2.90%  
Constant prepayment rate (as a percent) 0.00% 0.00% 0.00% 0.00%  
Anticipated net credit losses (as a percent) 0.00% 40.00% 0.00% 40.00%  
Weighted average life (in years) 0 years 9 years 9 months 18 days      
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     6.50%   7.60%
Constant prepayment rate (as a percent)     5.60%   14.00%
Anticipated net credit losses (as a percent)     76.10%   48.90%
Subordinated interests          
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables          
Discount rate (as a percent) 0.00%   0.00%    
Constant prepayment rate (as a percent) 0.00%   0.00%    
Anticipated net credit losses (as a percent) 0.00%   0.00%    
Sensitivity analysis of fair value of interests continued to be held by transferor          
Carrying value of retained interests $ 166   $ 166   $ 533
Carrying value of retained interests, impact of 10% adverse change in discount rate (8)   (8)   (25)
Carrying value of retained interests, impact of 20% adverse change in discount rate (16)   (16)   (49)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (4)   (4)   (9)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate (9)   (9)   (18)
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses (2)   (2)   (7)
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses $ (3)   $ (3)   $ (14)
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 (as a percent)   11.20%   4.40%  
Constant prepayment rate (as a percent)   3.50%   3.30%  
Anticipated net credit losses (as a percent)   38.10%   38.10%  
Weighted average life (in years)   8 years 10 months 24 days   0 years  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     5.20%   2.00%
Constant prepayment rate (as a percent)     0.50%   0.50%
Anticipated net credit losses (as a percent)     8.00%   3.80%
Weighted average life (in years)     1 year 2 months 12 days   10 months 24 days
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 (as a percent)   12.10%   12.10%  
Constant prepayment rate (as a percent)   8.00%   8.00%  
Anticipated net credit losses (as a percent)   52.10%   55.90%  
Weighted average life (in years)   12 years 10 months 24 days   12 years 10 months 24 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     32.70%   24.90%
Constant prepayment rate (as a percent)     37.50%   20.80%
Anticipated net credit losses (as a percent)     94.40%   92.00%
Weighted average life (in years)     17 years 7 months 6 days   19 years
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) 0.00% 0.00% 0.00% 7.20%  
Constant prepayment rate (as a percent) 0.00% 0.00% 0.00% 4.20%  
Anticipated net credit losses (as a percent) 0.00% 0.00% 0.00% 52.00%  
Weighted average life (in years) 0 years   0 years    
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     13.30%   8.40%
Constant prepayment rate (as a percent)     10.80%   7.50%
Anticipated net credit losses (as a percent)     47.50%   54.40%
Citicorp | U.S. government-sponsored agency guaranteed          
Cash Flows Between Transferor and Transferee          
Gains recognized on the securitization $ 36 $ 25 $ 81 $ 115  
Citicorp | Mortgage securitizations - Non-agency-sponsored          
Cash Flows Between Transferor and Transferee          
Gains recognized on the securitization $ 37 $ 7 $ 65 $ 38