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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Mortgage Securitizations (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 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 $ 7,200 10,600  
Contractual servicing fees received 100 $ 100  
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests 1,211   $ 2,258
Carrying value of retained interests, impact of 10% adverse change in discount rate (42)   (71)
Carrying value of retained interests, impact of 20% adverse change in discount rate (80)   (138)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (33)   (80)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate $ (69)   $ (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) 2.40% 2.10%  
Constant prepayment rate (as a percent) 3.80% 9.10%  
Weighted average life (in years) 6 years 6 months 3 years 6 months  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate (as a percent) 0.70%   0.70%
Constant prepayment rate (as a percent) 6.20%   6.80%
Weighted average life (in years) 0 years   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) 19.90% 11.50%  
Constant prepayment rate (as a percent) 10.50% 23.30%  
Weighted average life (in years) 12 years 2 months 12 days 17 years 6 months  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate (as a percent) 41.80%   28.20%
Constant prepayment rate (as a percent) 20.70%   22.80%
Weighted average life (in years) 28 years 7 months 6 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) 13.00% 8.40%  
Constant prepayment rate (as a percent) 6.20% 11.80%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate (as a percent) 9.50%   9.00%
Constant prepayment rate (as a percent) 9.80%   10.20%
Mortgage securitizations - Non-agency-sponsored      
Cash Flows Between Transferor and Transferee      
Proceeds from new securitizations $ 1,400 $ 4,200  
Contractual servicing fees received $ 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%  
Constant prepayment rate (as a percent) 0.00% 0.00%  
Anticipated net credit losses (as a percent)   0.00%  
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests $ 30   $ 26
Carrying value of retained interests, impact of 10% adverse change in discount rate (8)   (7)
Carrying value of retained interests, impact of 20% adverse change in discount rate (16)   (14)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (2)   (2)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate (3)   (3)
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses (7)   (7)
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses $ (14)   $ (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) 8.00%   4.20%
Anticipated net credit losses (as a percent) 0.50%   0.50%
Weighted average life (in years) 5 years 3 months 18 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) 4.40%   8.10%
Constant prepayment rate (as a percent) 13.10%   14.70%
Anticipated net credit losses (as a percent) 53.00%   85.60%
Weighted average life (in years) 8 years 7 months 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%  
Constant prepayment rate (as a percent) 0.00% 0.00%  
Anticipated net credit losses (as a percent) 0.00% 0.00%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate (as a percent) 0.50%   2.10%
Constant prepayment rate (as a percent) 12.30%   11.00%
Anticipated net credit losses (as a percent) 8.70%   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%  
Constant prepayment rate (as a percent) 0.00% 0.00%  
Anticipated net credit losses (as a percent) 0.00% 0.00%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Anticipated net credit losses (as a percent) 29.70%    
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests $ 168   $ 161
Carrying value of retained interests, impact of 10% adverse change in discount rate (8)   (8)
Carrying value of retained interests, impact of 20% adverse change in discount rate (15)   (16)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (3)   (4)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate (7)   (8)
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses (1)   (1)
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses $ (2)   $ (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) 6.20%   5.10%
Constant prepayment rate (as a percent) 0.50%   0.50%
Anticipated net credit losses (as a percent)     8.00%
Weighted average life (in years) 10 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) 23.80%   26.40%
Constant prepayment rate (as a percent) 23.60%   37.50%
Anticipated net credit losses (as a percent) 62.70%   63.70%
Weighted average life (in years) 11 years 10 months 24 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%  
Constant prepayment rate (as a percent) 0.00% 0.00%  
Anticipated net credit losses (as a percent) 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) 9.00%   10.80%
Anticipated net credit losses (as a percent) 49.00%   48.30%
Citicorp | Mortgage securitizations - U.S. agency sponsored      
Cash Flows Between Transferor and Transferee      
Gains recognized on the securitization $ 29 $ 25  
Citicorp | Mortgage securitizations - Non-agency-sponsored      
Cash Flows Between Transferor and Transferee      
Gains recognized on the securitization $ 20 $ 9