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Basis of Presentation (Policies)
6 Months Ended
Jun. 30, 2020
Summary Of Significant Accounting Policies [Line Items]  
Basis of Presentation The preparation of Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States of America (GAAP) requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses. These accounting estimates reflect the best judgment of management, but actual results could differ.
Recently Issued and Adopted Accounting Standards
Recently Adopted Accounting Standards
Effective January 1, 2020, Credco adopted the new credit reserving methodology, applicable to certain financial instruments, known as the Current Expected Credit Loss (CECL) methodology under a modified retrospective transition. The CECL methodology requires measurement of expected credit losses for the estimated life of the financial instrument, not only based on historical experience and current conditions, but also by including reasonable and supportable forecasts incorporating forward-looking information. Upon implementation, Card Member receivable reserves decreased by $147 million and Card Member loan reserves increased by $7 million, along with the associated current and deferred tax impact of $21 million, and cumulative effect adjustment to the opening balance of retained earnings, net of tax, of $119 million. There were no material changes to Credco’s business processes or internal controls as a result of adopting the new guidance. Refer to Note 3 for additional information on how management estimates reserves for credit losses in accordance with CECL methodology.
Derivatives Credco uses derivative financial instruments to manage exposures to various market risks. These instruments derive their value from an underlying variable or multiple variables, including interest rates and foreign exchange rates, and are carried at fair value on the Consolidated Balance Sheets.
Not Designated as Hedging Instrument [Member]  
Summary Of Significant Accounting Policies [Line Items]  
Derivatives The changes in the fair value of derivatives that are not designated as hedges are intended to offset the related foreign exchange gains or losses of the underlying foreign currency exposures.