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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Mortgage securitizations - U.S. agency sponsored          
Cash Flows Between Transferor and Transferee          
Proceeds from new securitizations $ 11,700 $ 11,700 $ 25,900 $ 32,500  
Contractual servicing fees received 100 $ 100 200 $ 300  
Sensitivity analysis of fair value of interests continued to be held by transferor          
Carrying value of retained interests 1,529   1,529   $ 2,258
Carrying value of retained interests, impact of 10% adverse change in discount rate (45)   (45)   (71)
Carrying value of retained interests, impact of 20% adverse change in discount rate (87)   (87)   (138)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (42)   (42)   (80)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate $ (87)   $ (87)   $ (160)
Mortgage securitizations - U.S. agency sponsored | 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) 2.00% 1.50% 2.00% 0.80%  
Constant prepayment rate (as a percent) 6.60% 7.70% 3.80% 7.70%  
Weighted average life (in years) 2 years 6 months 2 years 2 years 6 months 6 months  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     0.00%   0.70%
Constant prepayment rate (as a percent)     7.40%   6.80%
Weighted average life (in years)     4 months 24 days   2 months 12 days
Mortgage securitizations - U.S. agency sponsored | 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) 13.20% 13.00% 19.90% 13.00%  
Constant prepayment rate (as a percent) 31.60% 30.90% 31.60% 30.90%  
Weighted average life (in years) 10 years 6 months 9 years 9 months 18 days 14 years 6 months 17 years 6 months  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     82.40%   28.20%
Constant prepayment rate (as a percent)     31.60%   22.80%
Weighted average life (in years)     28 years   28 years 9 months 18 days
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) 8.50% 10.00% 9.10% 9.10%  
Constant prepayment rate (as a percent) 10.60% 13.70% 9.60% 12.80%  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     7.90%   9.00%
Constant prepayment rate (as a percent)     12.30%   10.20%
Mortgage securitizations - Non-agency-sponsored          
Cash Flows Between Transferor and Transferee          
Proceeds from new securitizations $ 4,100 $ 1,400 $ 6,900 $ 8,000  
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% 0.00% 0.00% 0.00%  
Constant prepayment rate (as a percent) 0.00% 0.00% 0.00% 0.00%  
Anticipated net credit losses (as a percent)   0.00% 0.00% 0.00%  
Sensitivity analysis of fair value of interests continued to be held by transferor          
Carrying value of retained interests $ 156   $ 156   $ 26
Carrying value of retained interests, impact of 10% adverse change in discount rate (3)   (3)   (7)
Carrying value of retained interests, impact of 20% adverse change in discount rate (6)   (6)   (14)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (1)   (1)   (2)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate (2)   (2)   (3)
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses (4)   (4)   (7)
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses $ (8)   $ (8)   $ (14)
Senior interests | Low end of range          
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     0.00%   0.00%
Constant prepayment rate (as a percent)     8.90%   4.20%
Anticipated net credit losses (as a percent)     0.30%   0.50%
Weighted average life (in years)     5 years 2 months 12 days   5 years
Senior interests | High end of range          
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     5.10%   8.10%
Constant prepayment rate (as a percent)     13.90%   14.70%
Anticipated net credit losses (as a percent)     50.20%   85.60%
Weighted average life (in years)     15 years 1 month 6 days   8 years 6 months
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% 0.00% 0.00% 0.00%  
Constant prepayment rate (as a percent) 0.00% 0.00% 0.00% 0.00%  
Anticipated net credit losses (as a percent) 0.00% 0.00% 0.00% 0.00%  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     1.00%   2.10%
Constant prepayment rate (as a percent)     12.90%   11.00%
Anticipated net credit losses (as a percent)     12.20%   31.40%
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% 0.00% 0.00%  
Constant prepayment rate (as a percent) 0.00% 0.00% 0.00% 0.00%  
Anticipated net credit losses (as a percent) 0.00% 0.00% 0.00% 0.00%  
Sensitivity analysis of fair value of interests continued to be held by transferor          
Carrying value of retained interests $ 189   $ 189   $ 161
Carrying value of retained interests, impact of 10% adverse change in discount rate (4)   (4)   (8)
Carrying value of retained interests, impact of 20% adverse change in discount rate (8)   (8)   (16)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (1)   (1)   (4)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate (3)   (3)   (8)
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses (1)   (1)   (1)
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses $ (1)   $ (1)   $ (2)
Subordinated interests | Low end of range          
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     4.80%   5.10%
Constant prepayment rate (as a percent)     0.50%   0.50%
Anticipated net credit losses (as a percent)     35.10%   8.00%
Weighted average life (in years)     4 months 24 days   1 year 2 months 12 days
Subordinated interests | High end of range          
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     33.90%   26.40%
Constant prepayment rate (as a percent)     13.10%   37.50%
Anticipated net credit losses (as a percent)     52.10%   63.70%
Weighted average life (in years)     18 years 9 months 18 days   12 years 1 month 6 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 (as a percent) 0.00% 0.00% 0.00% 0.00%  
Constant prepayment rate (as a percent) 0.00% 0.00% 0.00% 0.00%  
Anticipated net credit losses (as a percent) 0.00% 0.00% 0.00% 0.00%  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     9.70%   13.10%
Constant prepayment rate (as a percent)     7.00%   10.80%
Anticipated net credit losses (as a percent)     43.20%   48.30%
Personal Loan          
Cash Flows Between Transferor and Transferee          
Proceeds from new securitizations       $ 500  
Citicorp | Mortgage securitizations - U.S. agency sponsored          
Cash Flows Between Transferor and Transferee          
Gains recognized on the securitization $ 14 $ 36 $ 61 81  
Citicorp | Mortgage securitizations - Non-agency-sponsored          
Cash Flows Between Transferor and Transferee          
Gains recognized on the securitization $ 29 $ 37 $ 75 $ 65