Basis of Presentation	9 Months Ended
Basis of Presentation	Sep. 30, 2021
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 our 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, 2020. 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. Effective April 1, 2021, we prospectively changed the recognition of certain costs paid to a third party previously recognized over the twelve month card membership period in Net card fees in the Consolidated Statements of Income; such costs are now recorded as incurred in Marketing and business development expense. This change is not material to the Consolidated Financial Statements. Recently Adopted Accounting Standards Effective January 1, 2021, we elected to change our accounting for investments in qualified affordable housing projects from the equity method of accounting to the proportional amortization method (PAM) in accordance with the accounting guidance. PAM results in the amortization of the initial cost of the investment in proportion to the related tax credits, and recognition of the net investment performance in the statement of income as a component of Income tax provision, while the equity method reflected losses related to the investments as a component of Other, net expenses. As a result, we believe PAM is preferable as it better reflects the economics of our tax credit investments. Since the impact of this change is immaterial to our prior and current period financial statements, we implemented PAM on a prospective basis which resulted in a one-time charge to Income tax provision of $55 million in the first quarter of 2021, reflecting the cumulative impact of the difference in the timing of expense recognition between the equity method and PAM.