Summary of Significant Accounting Policies	9 Months Ended
Sep. 30, 2015
Disclosure Text Block [Abstract]
Basis of Presentation	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). Prior to July 1, 2014, these business travel operations were wholly owned. The Company also focuses on generating alternative sources of revenue on a global basis in areas such as online and mobile payments, and fee-based services. 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, targeted direct and third-party sales forces, and direct response advertising. The accompanying Consolidated Financial Statements should be read in conjunction with the consolidated financial statements incorporated by reference in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014 (the Annual Report). If not materially different, certain footnote disclosures included in the Annual Report 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. In the first quarter of 2015, the Company changed the classification related to certain payments to partners, reducing both discount revenue and marketing and promotion expense. Prior period amounts have been reclassified to conform to the current period presentation. None of the prior period financial statements were materially misstated from this misclassification. 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 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 2014, the FASB issued new accounting guidance on investments in Qualified Affordable Housing projects. Provided certain conditions are met, this standard permits entities to account for investments in Qualified Affordable Housing projects using the proportional amortization method. The standard also requires new disclosures about all investments in Qualified Affordable Housing projects irrespective of the method used to account for the investments. The Company has adopted this guidance in the first quarter of 2015 and has elected not to use the proportional amortization method, but continues to account for these investments using the equity method of accounting, which has been the Company’s historical practice. During the three and nine months ended September 30, 2015, the Company recognized equity method losses related to Qualified Affordable Housing of $14 million and $34 million, respectively, which were recognized in Other, net expenses; and associated tax credits of $15 million and $39 million, respectively, which were recognized in Income tax provision. Similarly, during the three and nine months ended September 30, 2014, the Company recognized equity method losses of $7 million and $39 million, respectively; and associated tax credits of $12 million and $30 million, respectively. The carrying value of these investments was $605 million and $522 million as of September 30, 2015 and December 31, 2014, respectively. In addition, as of September 30, 2015, the Company is contractually committed to provide additional funding related to certain of these investments, resulting in a liability of $134 million for unfunded commitments reported in Other liabilities, which is expected to be paid between 2015 and 2023.

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). Prior to July 1, 2014, these business travel operations were wholly owned. The Company also focuses on generating alternative sources of revenue on a global basis in areas such as online and mobile payments, and fee-based services. 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, targeted direct and third-party sales forces, and direct response advertising.

The accompanying Consolidated Financial Statements should be read in conjunction with the consolidated financial statements incorporated by reference in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014 (the Annual Report). If not materially different, certain footnote disclosures included in the Annual Report 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.

In the first quarter of 2015, the Company changed the classification related to certain payments to partners, reducing both discount revenue and marketing and promotion expense. Prior period amounts have been reclassified to conform to the current period presentation. None of the prior period financial statements were materially misstated from this misclassification.

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 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 2014, the FASB issued new accounting guidance on investments in Qualified Affordable Housing projects. Provided certain conditions are met, this standard permits entities to account for investments in Qualified Affordable Housing projects using the proportional amortization method. The standard also requires new disclosures about all investments in Qualified Affordable Housing projects irrespective of the method used to account for the investments. The Company has adopted this guidance in the first quarter of 2015 and has elected not to use the proportional amortization method, but continues to account for these investments using the equity method of accounting, which has been the Company’s historical practice.

During the three and nine months ended September 30, 2015, the Company recognized equity method losses related to Qualified Affordable Housing of $14 million and $34 million, respectively, which were recognized in Other, net expenses; and associated tax credits of $15 million and $39 million, respectively, which were recognized in Income tax provision. Similarly, during the three and nine months ended September 30, 2014, the Company recognized equity method losses of $7 million and $39 million, respectively; and associated tax credits of $12 million and $30 million, respectively. The carrying value of these investments was $605 million and $522 million as of September 30, 2015 and December 31, 2014, respectively. In addition, as of September 30, 2015, the Company is contractually committed to provide additional funding related to certain of these investments, resulting in a liability of $134 million for unfunded commitments reported in Other liabilities, which is expected to be paid between 2015 and 2023.