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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Mortgage Securitizations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
U.S. government-sponsored agency guaranteed      
Cash Flows Between Transferor and Transferee      
Principal securitized $ 4,900.0 $ 6,900.0 $ 6,100.0
Proceeds from new securitizations 4,900.0 6,700.0 6,400.0
Contractual servicing fees received 100.0 100.0 100.0
Cash flows received on retained interests and other net cash flows 0.0 0.0 0.0
Purchases of previously transferred financial assets $ 0.0 $ 100.0 200.0
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables      
Weighted-average life 7 years 8 months 12 days 9 years  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Weighted-average life 7 years 6 months 7 years 8 months 12 days  
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests $ 689.0 $ 659.0  
Carrying value of retained interests, impact of 10% adverse change in discount rate (20.0) (19.0)  
Carrying value of retained interests, impact of 20% adverse change in discount rate (40.0) (37.0)  
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (17.0) (15.0)  
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate $ (34.0) $ (30.0)  
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      
Weighted-average discount rate 12.90% 8.80%  
Weighted-average constant prepayment rate 5.90% 2.70%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Weighted-average discount rate 5.40% 5.30%  
Weighted-average constant prepayment rate 5.80% 5.80%  
Mortgage securitizations - Non-agency-sponsored      
Cash Flows Between Transferor and Transferee      
Principal securitized $ 4,800.0 $ 13,900.0 25,200.0
Proceeds from new securitizations 3,500.0 13,400.0 25,400.0
Contractual servicing fees received 0.0 0.0 0.0
Cash flows received on retained interests and other net cash flows 200.0 200.0 100.0
Purchases of previously transferred financial assets $ 0.0 $ 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      
Weighted-average life 6 years 9 months 18 days 5 years 6 months  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Weighted-average life   10 years 3 months 18 days  
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests $ 943.0 $ 1,119.0  
Carrying value of retained interests, impact of 10% adverse change in discount rate 0.0 0.0  
Carrying value of retained interests, impact of 20% adverse change in discount rate 0.0 0.0  
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate 0.0 0.0  
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate 0.0 0.0  
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses 0.0 0.0  
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses $ 0.0 $ 0.0  
Senior interests | Weighted Average      
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables      
Weighted-average discount rate 6.00% 3.20%  
Weighted-average constant prepayment rate 8.60% 6.00%  
Weighted-average anticipated net credit losses 0.20% 2.00%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Weighted-average discount rate   13.80%  
Weighted-average constant prepayment rate   4.00%  
Weighted-average anticipated net credit losses   1.00%  
Subordinated 
interests      
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables      
Weighted-average life 8 years 1 month 6 days 5 years 7 months 6 days  
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests $ 963.0 $ 943.0  
Carrying value of retained interests, impact of 10% adverse change in discount rate 0.0 0.0  
Carrying value of retained interests, impact of 20% adverse change in discount rate 0.0 0.0  
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate 0.0 0.0  
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate 0.0 0.0  
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses 0.0 0.0  
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses $ 0.0 $ 0.0  
Subordinated 
interests | Weighted Average      
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables      
Weighted-average discount rate 6.10% 4.10%  
Weighted-average constant prepayment rate 7.30% 11.40%  
Weighted-average anticipated net credit losses 0.90% 0.40%  
Personal loan      
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests $ 0.9    
Citicorp | U.S. government-sponsored agency guaranteed      
Cash Flows Between Transferor and Transferee      
Gains recognized on the securitization 0.4 $ 1.3 3.9
Citicorp | Mortgage securitizations - Non-agency-sponsored      
Cash Flows Between Transferor and Transferee      
Gains recognized on the securitization $ 88.7 $ 154.8 $ 493.4