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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Mortgage Securitizations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
U.S. government-sponsored agency guaranteed      
Cash Flows Between Transferor and Transferee      
Proceeds from new securitizations $ 33,900 $ 41,300 $ 35,000
Contractual servicing fees received 200 400 500
Cash flows received on retained interests and other net cash flows 0 100 100
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests 1,634 2,258  
Carrying value of retained interests, impact of 10% adverse change in discount rate (44) (71)  
Carrying value of retained interests, impact of 20% adverse change in discount rate (85) (138)  
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (41) (80)  
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate $ (84) $ (160)  
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 1.80% 0.80%  
Constant prepayment rate 3.80% 3.80%  
Weighted average life 2 years 6 months 6 months  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 1.80% 0.70%  
Constant prepayment rate 6.90% 6.80%  
Weighted average life 1 month 6 days 2 months 12 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 19.90% 13.70%  
Constant prepayment rate 31.60% 30.90%  
Weighted average life 20 years 8 months 12 days 17 years 6 months  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 84.20% 28.20%  
Constant prepayment rate 27.80% 22.80%  
Weighted average life 27 years 9 months 18 days 28 years 9 months 18 days  
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 8.60% 9.90%  
Constant prepayment rate 9.40% 11.10%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 7.10% 9.00%  
Constant prepayment rate 11.60% 10.20%  
Mortgage securitizations - Non-agency-sponsored      
Cash Flows Between Transferor and Transferee      
Proceeds from new securitizations $ 7,900 $ 11,800 12,100
Contractual servicing fees received 0 0 0
Cash flows received on retained interests and other net cash flows $ 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 0.00% 0.00%  
Constant prepayment rate 0.00% 0.00%  
Anticipated net credit losses 0.00% 0.00%  
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests $ 214 $ 26  
Carrying value of retained interests, impact of 10% adverse change in discount rate (2) (7)  
Carrying value of retained interests, impact of 20% adverse change in discount rate (4) (14)  
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (1) (2)  
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate (1) (3)  
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses (3) (7)  
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses $ (7) $ (14)  
Senior interests | Low end of range      
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 5.80% 0.00%  
Constant prepayment rate 8.90% 4.20%  
Anticipated net credit losses 0.40% 0.50%  
Weighted average life 4 years 9 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 100.00% 8.10%  
Constant prepayment rate 15.50% 14.70%  
Anticipated net credit losses 46.90% 85.60%  
Weighted average life 5 years 3 months 18 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 0.00% 0.00%  
Constant prepayment rate 0.00% 0.00%  
Anticipated net credit losses 0.00% 0.00%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 5.80% 2.10%  
Constant prepayment rate 8.90% 11.00%  
Anticipated net credit losses 46.90% 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 0.00% 0.00%  
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests $ 139 $ 161  
Carrying value of retained interests, impact of 10% adverse change in discount rate (3) (8)  
Carrying value of retained interests, impact of 20% adverse change in discount rate (5) (16)  
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (1) (4)  
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate (2) (8)  
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses 0 (1)  
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses $ 0 $ (2)  
Subordinated interests | Low end of range      
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 2.80% 5.10%  
Constant prepayment rate 8.60% 0.50%  
Anticipated net credit losses 35.10% 0.80%  
Weighted average life 2 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 35.10% 26.40%  
Constant prepayment rate 13.10% 37.50%  
Anticipated net credit losses 52.10% 63.70%  
Weighted average life 18 years 7 months 6 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 0.00% 0.00%  
Constant prepayment rate 0.00% 0.00%  
Anticipated net credit losses 0.00% 0.00%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 9.00% 13.10%  
Constant prepayment rate 10.60% 10.80%  
Anticipated net credit losses 44.90% 48.30%  
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 $ 73 105 149
Citicorp | Mortgage securitizations - Non-agency-sponsored      
Cash Flows Between Transferor and Transferee      
Gains recognized on the securitization $ 77 $ 107 $ 41