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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, 2016
Dec. 31, 2015
Sep. 30, 2015
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Receivables held for sale carried at the lower of amortized cost or fair value $ 9,500 $ 8,668  
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% 100.00%  
Expenses incurred through collateral disposition 10.00% 10.00%  
Market discount rate 15.00% 14.00%  
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 $ 9,391 $ 8,265 $ 8,406
[1] At September 30, 2016 and December 31, 2015, the weighted average collateral loss severity rate was 47 percent and 42 percent, respectively, taking into consideration both expected net cash flows as well as current collateral values.