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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Mortgage Securitizations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
U.S. government-sponsored agency guaranteed      
Cash Flows Between Transferor and Transferee      
Proceeds from new securitizations $ 41,300 $ 35,000 $ 27,800
Contractual servicing fees received 400 500 600
Cash flows received on retained interests and other net cash flows 100 100 100
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests 2,258 3,546  
Carrying value of retained interests, impact of 10% adverse change in discount rate (71) (79)  
Carrying value of retained interests, impact of 20% adverse change in discount rate (138) (155)  
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (80) (111)  
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate $ (160) $ (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 0.80% 0.00%  
Constant prepayment rate 3.80% 5.70%  
Weighted average life 6 months 3 years 6 months  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 0.70% 0.00%  
Constant prepayment rate 6.80% 5.70%  
Weighted average life 2 months 12 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 13.70% 11.40%  
Constant prepayment rate 30.90% 34.90%  
Weighted average life 17 years 6 months 13 years 9 months 18 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 28.20% 27.00%  
Constant prepayment rate 22.80% 27.80%  
Weighted average life 28 years 9 months 18 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 9.90% 6.80%  
Constant prepayment rate 11.10% 11.80%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 9.00% 4.90%  
Constant prepayment rate 10.20% 12.30%  
Mortgage securitizations - Non-agency-sponsored      
Cash Flows Between Transferor and Transferee      
Proceeds from new securitizations $ 11,800 $ 12,100 11,800
Contractual servicing fees received 0 0 0
Cash flows received on retained interests and other net cash flows 0 0 0
Senior interests      
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests 26 179  
Carrying value of retained interests, impact of 10% adverse change in discount rate (7) (8)  
Carrying value of retained interests, impact of 20% adverse change in discount rate (14) (15)  
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (2) (3)  
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate (3) (6)  
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses (7) (6)  
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses $ (14) $ (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   2.00%  
Anticipated net credit losses   40.00%  
Weighted average life   2 years 6 months  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 0.00% 1.60%  
Constant prepayment rate 4.20% 4.20%  
Anticipated net credit losses 0.50% 0.20%  
Weighted average life 5 years 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%  
Weighted average life   9 years 9 months 18 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 8.10% 67.60%  
Constant prepayment rate 14.70% 100.00%  
Anticipated net credit losses 85.60% 89.10%  
Weighted average life 8 years 6 months 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 0.00% 2.90%  
Anticipated net credit losses 0.00% 40.00%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 2.10% 7.60%  
Constant prepayment rate 11.00% 14.00%  
Anticipated net credit losses 31.40% 48.90%  
Subordinated interests      
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests $ 161 $ 533  
Carrying value of retained interests, impact of 10% adverse change in discount rate (8) (25)  
Carrying value of retained interests, impact of 20% adverse change in discount rate (16) (49)  
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (4) (9)  
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate (8) (18)  
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses (1) (7)  
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses $ (2) $ (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   2.90%  
Constant prepayment rate   2.80%  
Anticipated net credit losses   38.10%  
Weighted average life   8 years 10 months 24 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 5.10% 2.00%  
Constant prepayment rate 0.50% 0.50%  
Anticipated net credit losses 8.00% 3.80%  
Weighted average life 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   12.10%  
Constant prepayment rate   8.00%  
Anticipated net credit losses   92.00%  
Weighted average life   12 years 10 months 24 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 26.40% 24.90%  
Constant prepayment rate 37.50% 20.80%  
Anticipated net credit losses 63.70% 92.00%  
Weighted average life 12 years 1 month 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 0.00% 5.20%  
Constant prepayment rate 0.00% 3.50%  
Anticipated net credit losses 0.00% 70.60%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 13.10% 8.40%  
Constant prepayment rate 10.80% 7.50%  
Anticipated net credit losses 48.30% 54.40%  
Personal loan      
Cash Flows Between Transferor and Transferee      
Proceeds from new securitizations $ 500 $ 700  
Citicorp | U.S. government-sponsored agency guaranteed      
Cash Flows Between Transferor and Transferee      
Gains recognized on the securitization 105 149 214
Citicorp | Mortgage securitizations - Non-agency-sponsored      
Cash Flows Between Transferor and Transferee      
Gains recognized on the securitization $ 107 $ 41 $ 53