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Fair Value Measurements - Quantitative Information for Non-Recurring Fair Value Measurements (Detail) - Level 3 [Member] - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Receivables held for sale carried at the lower of amortized cost or fair value $ 8,752 $ 937  
Real Estate Secured Receivables Held for Sale [Member] | Third Party Appraisal Valuation [Member] | Minimum [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Collateral loss severity rates [1] 0.00% 0.00%  
Expenses incurred through collateral disposition 5.00% 5.00%  
Market discount rate 4.00% 4.00%  
Real Estate Secured Receivables Held for Sale [Member] | Third Party Appraisal Valuation [Member] | Maximum [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Collateral loss severity rates [1] 100.00% 79.00%  
Expenses incurred through collateral disposition 10.00% 10.00%  
Market discount rate 14.00% 8.00%  
Real Estate Secured Receivables Held for Sale [Member] | Non-Recurring Fair Value Measurements [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Receivables held for sale carried at the lower of amortized cost or fair value $ 8,406 $ 860 $ 842
[1] As discussed below, as a result of our decision during the second quarter of 2015 to expand our receivable sales program, at June 30, 2015, we added additional pools to our fair value estimation process in line with the new risk characteristics that now exist in the expanded receivables held for sale portfolio. At September 30, 2015, the weighted average collateral loss severity rate was 42 percent, taking into consideration both expected net cash flows as well as current collateral values. At December 31, 2014, the weighted average collateral loss severity rate was 18 percent based solely on consideration of collateral value reflecting the risk characteristics of the receivables held for sale portfolio at that time.