Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Mar. 31, 2016
Disclosure Text Block [Abstract]
Basis of Presentation	1. Basis of Presentation The Company American Express Company (the Company) is a global services company that provides customers with access to products, insights and experiences that enrich lives and build business success. The Company’s principal products and services are charge and credit payment card products and travel-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 (GBT JV). The Company’s 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 direct mail, online applications, in-house and third-party sales forces and direct response advertising. Effective for the first quarter of 2016, the Company realigned its segment presentation to reflect the organizational changes announced during the fourth quarter of 2015. Prior periods have been restated to conform to the new reportable operating segments, which are as follows: U.S. Consumer Services (USCS), including the proprietary U.S. Consumer Card Services business and travel services in the United States; International Consumer and Network Services (ICNS), including the proprietary International Consumer Card Services business, Global Network Services (GNS) business and travel services outside the United States; Global Commercial Services (GCS), including the proprietary Global Corporate Payments (GCP) business, small business services businesses in the United States and internationally (collectively, Global Small Business Services (GSBS)), merchant financing products and foreign exchange services operations; and Global Merchant Services (GMS), including the Global Merchant Services business and global loyalty coalition businesses. Corporate functions and certain other businesses and operations are included in Corporate & Other. The accompanying Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015 (the Annual Report). If not materially different, certain footnote disclosures included therein have been omitted from this Quarterly Report on Form 10-Q. The interim consolidated financial information in this report has not been audited. In the opinion of management, all adjustments, which consist of normal recurring adjustments necessary for a fair statement of the interim period consolidated financial information, 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. Certain reclassifications of prior period amounts have been made to conform to the current period presentation. Travel commissions and fees, which were separately disclosed on the Consolidated Statements of Income historically, are now included within Other fees and commissions. Recently Issued Accounting Standards In May 2014, the Financial Accounting Standards Board (FASB) issued new accounting guidance on revenue recognition. The guidance establishes the principles to apply to determine the amount and timing of revenue recognition, specifying the accounting for certain costs related to revenue, and requiring additional disclosures about the nature, amount, timing and uncertainty of revenues and related cash flows. The guidance, as amended, supersedes most of the current revenue recognition requirements, and is effective January 1, 2018, with early adoption as of January 1, 2017, permitted. The Company does not intend to adopt the new standard early and continues to evaluate the impact this guidance, including the method of implementation, will have on its financial position, results of operations and cash flows, among other items. In January 2016, the FASB issued new accounting guidance on the recognition and measurement of financial assets and financial liabilities. The standard, which is effective January 1, 2018, makes targeted changes to current GAAP, specifically to the classification and measurement of equity securities, and to certain disclosure requirements associated with the fair value of financial instruments. The Company is currently evaluating the impact this guidance will have on its financial position, results of operations and cash flows, among other items. In February 2016, the FASB issued new accounting guidance on leases. The guidance, which is effective January 1, 2019, with early adoption permitted, requires virtually all leases to be recognized on the Consolidated Balance Sheets and requires retrospective presentation. The Company is currently evaluating the impact this guidance will have on its financial position, results of operations and cash flows, among other items. In March 2016, the FASB issued new accounting guidance on employee share-based payments. The guidance, which is effective January 1, 2017, with early adoption permitted, simplifies various aspects of the accounting for share-based payment transactions, including the income tax consequences, accounting for award forfeitures, and classification on the Consolidated Statements of Cash Flows. The Company is currently evaluating the impact this guidance will have on its financial position, results of operations and cash flows, among other items.