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Significant Accounting Policies (Policies)
6 Months Ended
Jun. 30, 2015
Accounts Receivable And Loans and Reserves For Cardmember Losses [Abstract]  
Card Member And Other Receivables And Loans

American Express’ charge and lending payment card products result in the generation of Card Member receivables and Card Member loans, respectively.

Reserves For Losses Policy [Abstract]  
Reserves for losses

Reserves for losses relating to Card Member receivables and loans represent management’s best estimate of the probable inherent losses in Credco’s outstanding portfolio of receivables and loans, as of the balance sheet date. Management’s evaluation process requires certain estimates and judgments.

Derivatives And Hedging Activities Policy [Abstract]  
Derivatives

Credco uses derivative financial instruments (derivatives) to manage exposures to various market risks. These instruments derive their value from an underlying variable or multiple variables, including interest rate and foreign exchange rates and are carried at fair value on the Consolidated Balance Sheets. These instruments enable end users to increase, reduce or alter exposure to various market risks and, for that reason, are an integral component of Credco’s market risk management. Credco does not engage in derivatives for trading purposes.