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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Mortgage Securitizations (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Mortgage securitizations - U.S. agency sponsored      
Cash Flows Between Transferor and Transferee      
Proceeds from new securitizations $ 8,000 $ 7,200  
Contractual servicing fees received 0 $ 100  
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests 1,767   $ 1,634
Carrying value of retained interests, impact of 10% adverse change in discount rate (47)   (44)
Carrying value of retained interests, impact of 20% adverse change in discount rate (91)   (85)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (37)   (41)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate $ (75)   $ (84)
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) 3.00% 2.40%  
Constant prepayment rate (as a percent) 4.20% 3.80%  
Weighted average life (in years) 7 years 8 months 12 days 6 years 6 months  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate (as a percent) 0.80%   1.80%
Constant prepayment rate (as a percent) 4.30%   6.90%
Weighted average life (in years) 1 month 6 days   1 month 6 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) 11.40% 19.90%  
Constant prepayment rate (as a percent) 16.00% 10.50%  
Weighted average life (in years) 18 years 12 years 2 months 12 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate (as a percent) 41.30%   84.20%
Constant prepayment rate (as a percent) 18.40%   27.80%
Weighted average life (in years) 27 years 6 months   27 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) 6.40% 13.00%  
Constant prepayment rate (as a percent) 8.50% 6.20%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate (as a percent) 6.20%   7.10%
Constant prepayment rate (as a percent) 10.30%   11.60%
Mortgage securitizations - Non-agency-sponsored      
Cash Flows Between Transferor and Transferee      
Proceeds from new securitizations $ 3,400 $ 1,400  
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%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate (as a percent) 6.50%    
Constant prepayment rate (as a percent) 8.90%    
Anticipated net credit losses (as a percent) 46.90%    
Weighted average life (in years) 5 years 4 months 24 days    
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests $ 245   $ 214
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 related to transferor's continuing involvement      
Discount rate (as a percent)     5.80%
Constant prepayment rate (as a percent)     8.90%
Anticipated net credit losses (as a percent)     0.40%
Weighted average life (in years)     4 years 9 months 18 days
Senior interests | High end of range      
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate (as a percent)     100.00%
Constant prepayment rate (as a percent)     15.50%
Anticipated net credit losses (as a percent)     46.90%
Weighted average life (in years)     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 (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) 6.50%   5.80%
Constant prepayment rate (as a percent) 8.90%   8.90%
Anticipated net credit losses (as a percent) 46.90%   46.90%
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%  
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests $ 138   $ 139
Carrying value of retained interests, impact of 10% adverse change in discount rate (2)   (3)
Carrying value of retained interests, impact of 20% adverse change in discount rate (4)   (5)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (1)   (1)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate (2)   (2)
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 $ (1)   $ 0
Subordinated interests | Low end of range      
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate (as a percent) 4.00%   2.80%
Constant prepayment rate (as a percent) 9.10%   8.60%
Anticipated net credit losses (as a percent) 35.10%   35.10%
Weighted average life (in years) 2 years 1 month 6 days   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) 11.20%   35.10%
Constant prepayment rate (as a percent) 13.10%   13.10%
Anticipated net credit losses (as a percent) 52.10%   52.10%
Weighted average life (in years) 18 years 3 months 18 days   18 years 7 months 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) 7.30%   9.00%
Constant prepayment rate (as a percent) 10.70%   10.60%
Anticipated net credit losses (as a percent) 44.50%   44.90%
Citicorp | Mortgage securitizations - U.S. agency sponsored      
Cash Flows Between Transferor and Transferee      
Gains recognized on the securitization $ 5 $ 29  
Citicorp | Mortgage securitizations - Non-agency-sponsored      
Cash Flows Between Transferor and Transferee      
Gains recognized on the securitization $ 18 $ 20