v3.3.1.900
Reserves For Losses (Details Textuals) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for Card Member Receivables, Recoveries of Bad Debts $ 401 $ 358 $ 402
Allowance for Card Member Loans, Recoveries of Bad Debts 418 428 452
Allowance for Card Member Receivables, Recoveries of Bad Debts - TDR 60 15 12
Allowance for Card Member Loans, Recoveries of Bad Debts - TDR 41 (10) (1)
Card Member loans reserves for losses - other 10 12 (22)
Unauthorized Transactions [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Card Member receivables reserves for losses - other   (7)  
Card Member loans reserves for losses - other   (6)  
Foreign Currency Translation Adjustments [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Card Member receivables reserves for losses - other (16) (15) (4)
Card Member loans reserves for losses - other (20) (17) (12)
Other Items [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Card Member receivables reserves for losses - other $ (11) $ (8) $ (17)