Basis of Presentation	6 Months Ended
Basis of Presentation	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The Company We are a globally integrated payments company that provides our customers with access to products, insights and experiences that enrich lives and build business success. Our principal products and services are credit and charge card products, along with travel and lifestyle related services, offered to consumers and businesses around the world. Business travel-related services are offered through the non-consolidated joint venture, American Express Global Business Travel. Our various products and services are sold globally to diverse customer groups, including consumers, small businesses, mid-sized companies and large corporations. These products and services are sold through various channels, including mobile and online applications, affiliate marketing, customer referral programs, third-party vendors and business partners, direct mail, telephone, in-house sales teams, and direct response advertising. The accompanying Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2019. If not materially different, certain note disclosures included therein have been omitted from these Consolidated Financial Statements. The interim Consolidated Financial Statements included in this report have not been audited. In the opinion of management, all adjustments, which consist of normal recurring adjustments necessary for a fair statement of the interim Consolidated Financial Statements, have been made. Results of operations reported for interim periods are not necessarily indicative of results for the entire year. 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, and the disclosures of contingent assets and liabilities. These accounting estimates reflect the best judgment of management, but actual results could differ. We evaluate goodwill for impairment annually as of June 30, or more frequently if events occur or circumstances change that would more likely than not reduce the fair value of one or more of our reporting units below its carrying value. As of June 30, 2020, we performed a qualitative assessment in connection with our annual goodwill impairment evaluation, including the impacts of the COVID-19 pandemic, and determined that it was more likely than not that the fair values of our reporting units exceeded their carrying values. Certain reclassifications of prior period amounts have been made to conform to the current period presentation. Recently Adopted Accounting Standards Effective January 1, 2020, we 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, total loan reserves increased by $1,663 million and total receivable reserves decreased by $493 million, along with the associated current and deferred tax impact of $288 million, and an offset to the opening balance of retained earnings, net of tax, of $882 million. There were no material changes to our 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 the CECL methodology. In addition, for available-for-sale debt securities, the new methodology replaces the other-than-temporary impairment model and requires the recognition of an allowance for reductions in a security’s fair value attributable to declines in credit quality, instead of a direct write-down of the security, when a valuation decline is determined to be other-than-temporary. There was no financial impact related to this implementation. Refer to Note 4 for additional information.