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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Mortgage Securitizations (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Personal Loan          
Cash Flows Between Transferor and Transferee          
Proceeds from new securitizations       $ 500  
Mortgage securitizations - U.S. agency sponsored          
Cash Flows Between Transferor and Transferee          
Proceeds from new securitizations $ 7,000 $ 10,300 $ 14,200 20,900  
Contractual servicing fees received 100 $ 100 100 $ 200  
Sensitivity analysis of fair value of interests continued to be held by transferor          
Carrying value of retained interests 1,895   1,895   $ 2,258
Carrying value of retained interests, impact of 10% adverse change in discount rate (52)   (52)   (71)
Carrying value of retained interests, impact of 20% adverse change in discount rate (102)   (102)   (138)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (39)   (39)   (80)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate $ (80)   $ (80)   $ (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) 2.50% 0.80% 2.40% 0.80%  
Constant prepayment rate (as a percent) 6.50% 8.60% 3.80% 8.60%  
Weighted average life (in years) 4 years 10 months 24 days 6 months 4 years 10 months 24 days 6 months  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     0.10%   0.70%
Constant prepayment rate (as a percent)     7.00%   6.80%
Weighted average life (in years)     1 month 6 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) 14.00% 11.50% 19.90% 11.50%  
Constant prepayment rate (as a percent) 16.10% 26.80% 16.10% 26.80%  
Weighted average life (in years) 14 years 6 months 11 years 4 months 24 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)     60.30%   28.20%
Constant prepayment rate (as a percent)     21.00%   22.80%
Weighted average life (in years)     28 years 3 months 18 days   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) 7.60% 9.10% 9.50% 8.70%  
Constant prepayment rate (as a percent) 10.60% 13.30% 9.10% 12.50%  
Key assumptions used in measuring fair value related to transferor's continuing involvement          
Discount rate (as a percent)     6.90%   9.00%
Constant prepayment rate (as a percent)     11.60%   10.20%
Mortgage securitizations - Non-agency-sponsored          
Cash Flows Between Transferor and Transferee          
Proceeds from new securitizations $ 1,400 $ 2,300 $ 2,800 $ 6,500  
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 $ 13   $ 13   $ 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 (7)   (7)   (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 $ (9)   $ (9)   $ (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)     0.40%   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)     11.60%   8.10%
Constant prepayment rate (as a percent)     13.80%   14.70%
Anticipated net credit losses (as a percent)     50.20%   85.60%
Weighted average life (in years)     17 years 4 months 24 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)     1.60%   2.10%
Constant prepayment rate (as a percent)     12.30%   11.00%
Anticipated net credit losses (as a percent)     17.00%   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 $ 153   $ 153   $ 161
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)   (16)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (3)   (3)   (4)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate (6)   (6)   (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)     5.60%   5.10%
Constant prepayment rate (as a percent)     0.50%   0.50%
Anticipated net credit losses (as a percent)     35.70%   8.00%
Weighted average life (in years)     8 months 12 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)     20.90%   26.40%
Constant prepayment rate (as a percent)     20.10%   37.50%
Anticipated net credit losses (as a percent)     60.30%   63.70%
Weighted average life (in years)     10 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)     11.80%   13.10%
Constant prepayment rate (as a percent)     9.60%   10.80%
Anticipated net credit losses (as a percent)     46.60%   48.30%
Citicorp | Mortgage securitizations - U.S. agency sponsored          
Cash Flows Between Transferor and Transferee          
Gains recognized on the securitization $ 18 $ 20 $ 47 $ 45  
Citicorp | Mortgage securitizations - Non-agency-sponsored          
Cash Flows Between Transferor and Transferee          
Gains recognized on the securitization $ 26 $ 19 $ 46 $ 28