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Fair Value Measurements - Quantitative Information for Non-Recurring Fair Value Measurements (Detail) (Level 3 [Member], USD $)
In Millions, unless otherwise specified
 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Real Estate Secured [Member]
Third Party Appraisal Valuation [Member]
Minimum [Member]
Dec. 31, 2013
Real Estate Secured [Member]
Third Party Appraisal Valuation [Member]
Minimum [Member]
Sep. 30, 2014
Real Estate Secured [Member]
Third Party Appraisal Valuation [Member]
Maximum [Member]
Dec. 31, 2013
Real Estate Secured [Member]
Third Party Appraisal Valuation [Member]
Maximum [Member]
Sep. 30, 2014
Real Estate Secured [Member]
Non-Recurring Fair Value Measurements [Member]
Dec. 31, 2013
Real Estate Secured [Member]
Non-Recurring Fair Value Measurements [Member]
Sep. 30, 2013
Real Estate Secured [Member]
Non-Recurring Fair Value Measurements [Member]
Sep. 30, 2013
Personal non-credit card [Member]
Non-Recurring Fair Value Measurements [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                    
Receivables held for sale carried at fair value: $ 873 $ 2,047         $ 842 $ 2,047 $ 3,816 $ 0 [1]
Collateral loss severity rates     0.00% [2] 0.00% [2] 87.00% [2] 93.00% [2]        
Expenses incurred through collateral disposition     5.00% 5.00% 10.00% 10.00%        
Market discount rate     4.00% 6.00% 8.00% 10.00%        
[1] Our personal non-credit card portfolio was sold on April 1, 2013 as discussed more fully in Note 7, "Receivables Held for Sale," in our 2013 Form 10-K.
[2] The majority of the real estate secured receivables held for sale consider collateral value, among other items, in determining fair value. Collateral values are based on the most recently available broker's price opinion and the collateral loss severity rates averaged 18 percent and 21 percent at September 30, 2014 and December 31, 2013, respectively. In the current market conditions, investors also take into consideration the fact that the most recently available broker's price opinion may not capture all of the home price appreciation due to the timing of the receipt of the opinion.