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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Mortgage Securitizations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
U.S. government-sponsored agency guaranteed      
Cash Flows Between Transferor and Transferee      
Principal securitized $ 4,000 $ 7,800 $ 14,800
Proceeds from new securitizations 4,200 8,100 15,400
Contractual servicing fees received 100 200 400
Purchases of previously transferred financial assets 200 400 500
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests 564 529  
Carrying value of retained interests, impact of 10% adverse change in discount rate (16) (21)  
Carrying value of retained interests, impact of 20% adverse change in discount rate (32) (40)  
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (21) (21)  
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate $ (41) $ (40)  
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      
Weighted average life 7 years 2 months 12 days 6 years 6 months  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Weighted average life 3 years 7 months 6 days 3 years 9 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      
Weighted average life 7 years 8 months 12 days 7 years 6 months  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Weighted average life 7 years 6 months 6 years 10 months 24 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 9.60% 13.70%  
Constant prepayment rate 5.80% 6.70%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 7.80% 12.00%  
Constant prepayment rate 9.10% 11.20%  
Mortgage securitizations - Non-agency-sponsored      
Cash Flows Between Transferor and Transferee      
Principal securitized $ 5,600 $ 7,300 300
Proceeds from new securitizations 7,100 7,300 300
Contractual servicing fees received 0 0 0
Purchases of previously transferred financial assets $ 0 0 0
Senior interests      
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Weighted average life 6 years 7 months 6 days    
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests $ 300 132  
Carrying value of retained interests, impact of 10% adverse change in discount rate 0 (2)  
Carrying value of retained interests, impact of 20% adverse change in discount rate 0 (4)  
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate 0 (1)  
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate 0 (1)  
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses 0 (3)  
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses $ 0 $ (7)  
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      
Weighted average life 2 years 6 months 4 years 3 months 18 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Weighted average life   4 years 9 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      
Weighted average life 9 years 10 months 24 days 9 years 4 months 24 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Weighted average life   5 years 3 months 18 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 2.80% 3.10%  
Constant prepayment rate 8.00% 4.30%  
Anticipated net credit losses 4.40% 7.00%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 9.30% 5.80%  
Constant prepayment rate 8.00% 8.90%  
Anticipated net credit losses 40.00% 46.90%  
Subordinated interests      
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests $ 51 $ 30  
Carrying value of retained interests, impact of 10% adverse change in discount rate 0 0  
Carrying value of retained interests, impact of 20% adverse change in discount rate 0 0  
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate 0 0  
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate 0 0  
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses 0 0  
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses $ 0 $ 0  
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      
Anticipated net credit losses   38.10%  
Weighted average life 2 years 6 months 4 years 3 months 18 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      
Anticipated net credit losses   92.00%  
Weighted average life 15 years 8 months 12 days 10 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 4.40% 3.90%  
Constant prepayment rate 9.10% 4.30%  
Anticipated net credit losses 3.40% 8.70%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 0.00% 0.00%  
Constant prepayment rate 0.00% 0.00%  
Anticipated net credit losses 0.00% 0.00%  
Personal loan      
Cash Flows Between Transferor and Transferee      
Proceeds from new securitizations     300
Citicorp | U.S. government-sponsored agency guaranteed      
Cash Flows Between Transferor and Transferee      
Gains recognized on the securitization $ 17 $ 28 76
Citicorp | Mortgage securitizations - Non-agency-sponsored      
Cash Flows Between Transferor and Transferee      
Gains recognized on the securitization $ 36 $ 70 $ (5)