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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Mortgage Securitizations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
U.S. government-sponsored agency guaranteed      
Cash Flows Between Transferor and Transferee      
Proceeds from new securitizations(1) $ 25,600    
Contractual servicing fees received 500    
Cash flows received on retained interests and other net cash flows 100    
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests 2,563 $ 2,374  
Carrying value of retained interests, impact of 10% adverse change in discount rate (65) (69)  
Carrying value of retained interests, impact of 20% adverse change in discount rate (127) (134)  
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (102) (93)  
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate $ (196) $ (179)  
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 0.00% 0.00%  
Constant prepayment rate 5.70% 0.00%  
Weighted average life 3 years 6 months 0 years  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 0.00% 0.00%  
Constant prepayment rate 6.50% 6.00%  
Weighted average life 1 year 3 months 18 days 0 years  
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 11.30% 14.70%  
Constant prepayment rate 34.90% 23.10%  
Weighted average life 10 years 4 months 24 days 9 years 8 months 12 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 22.10% 21.20%  
Constant prepayment rate 27.80% 41.40%  
Weighted average life 21 years 16 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 8.00% 11.00%  
Constant prepayment rate 11.70% 6.20%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 5.70% 8.40%  
Constant prepayment rate 12.50% 15.30%  
Mortgage securitizations - Non-agency-sponsored      
Cash Flows Between Transferor and Transferee      
Proceeds from new securitizations(1) $ 12,100    
Contractual servicing fees received 0    
Cash flows received on retained interests and other net cash flows 0    
Senior interests      
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests 179 $ 310  
Carrying value of retained interests, impact of 10% adverse change in discount rate (8) (7)  
Carrying value of retained interests, impact of 20% adverse change in discount rate (15) (13)  
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (3) (3)  
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate (6) (5)  
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses (6) (6)  
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses $ (11) $ (10)  
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% 1.40%  
Constant prepayment rate 0.00%    
Anticipated net credit losses   40.00%  
Weighted average life 2 years 6 months 2 years 7 months 6 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 1.60% 1.10%  
Constant prepayment rate 4.20% 2.00%  
Anticipated net credit losses 0.20% 0.00%  
Weighted average life 3 months 18 days 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% 6.60%  
Constant prepayment rate 7.00%    
Anticipated net credit losses   67.10%  
Weighted average life 9 years 9 months 18 days 11 years 1 month 6 days  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 67.60% 47.10%  
Constant prepayment rate 100.00% 100.00%  
Anticipated net credit losses 89.10% 92.40%  
Weighted average life 18 years 1 month 6 days 14 years 4 months 24 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 2.90% 4.20%  
Constant prepayment rate   5.40%  
Anticipated net credit losses 40.00% 56.30%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 7.60% 7.70%  
Constant prepayment rate 14.00% 10.90%  
Anticipated net credit losses 48.90% 51.70%  
Subordinated interests      
Sensitivity analysis of fair value of interests continued to be held by transferor      
Carrying value of retained interests $ 553 $ 554  
Carrying value of retained interests, impact of 10% adverse change in discount rate (25) (30)  
Carrying value of retained interests, impact of 20% adverse change in discount rate (49) (57)  
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate (9) (9)  
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate (18) (18)  
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses (7) (9)  
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses $ (14) $ (16)  
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% 2.60%  
Constant prepayment rate 2.80% 0.50%  
Anticipated net credit losses 38.10% 8.90%  
Weighted average life 8 years 10 months 24 days 3 years  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 2.00% 1.30%  
Constant prepayment rate 0.50% 0.50%  
Anticipated net credit losses 3.80% 13.70%  
Weighted average life 10 months 24 days 0 years  
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% 9.10%  
Constant prepayment rate 8.00% 8.90%  
Anticipated net credit losses 92.00% 58.50%  
Weighted average life 12 years 10 months 24 days 14 years 6 months  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 24.90% 19.60%  
Constant prepayment rate 20.80% 16.20%  
Anticipated net credit losses 92.00% 83.80%  
Weighted average life 19 years 24 years 4 months 24 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 5.20% 7.80%  
Constant prepayment rate 3.50% 3.20%  
Anticipated net credit losses 70.60% 43.10%  
Key assumptions used in measuring fair value related to transferor's continuing involvement      
Discount rate 8.40% 8.20%  
Constant prepayment rate 7.50% 7.20%  
Anticipated net credit losses 54.40% 52.50%  
Agency and non-agency sponsored mortgages      
Cash Flows Between Transferor and Transferee      
Proceeds from new securitizations(1)   $ 39,600 $ 72,700
Contractual servicing fees received   500 700
Cash flows received on retained interests and other net cash flows   100 100
Personal Loan      
Cash Flows Between Transferor and Transferee      
Proceeds from new securitizations(1) $ 700    
Citicorp | U.S. government-sponsored agency guaranteed      
Cash Flows Between Transferor and Transferee      
Gains recognized on the securitization 150 $ 267  
Citicorp | Mortgage securitizations - Non-agency-sponsored      
Cash Flows Between Transferor and Transferee      
Gains recognized on the securitization $ 44   $ 223