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Accounts Receivable and Loans (Details 6) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Account
Jun. 30, 2013
Account
Jun. 30, 2014
Account
Jun. 30, 2013
Account
Accounts Receivable and Loans Textuals [Abstract]        
Difference between pre- and post-modification outstanding balances       $ 4
U S Card Services [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Accounts 15,000 16,000 31,000 47,000
Aggregated Outstanding Balance 123 145 266 421
Card Member Loans [Member] | U S Card Services [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Accounts 12,000 12,000 24,000 35,000
Aggregated Outstanding Balance 82 94 178 267
Average basis point reduction in interest rate by class of Card Member loans 11.00% 11.00% 12.00% 12.00%
Card Member Receivables [Member] | U S Card Services [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Accounts 3,000 4,000 7,000 12,000
Aggregated Outstanding Balance $ 41 $ 51 $ 88 $ 154
Average payment term extension 12 12 12 12