Basis of Presentation (Policies)	9 Months Ended
Basis of Presentation (Policies)	Sep. 30, 2017
Basis of Presentation	The accompanying unaudited condensed consolidated financial statements of American Airlines Group Inc. (we, us, our and similar terms, or AAG) should be read in conjunction with the consolidated financial statements contained in our Annual Report on Form 10-K for the year ended December 31, 2016. The accompanying unaudited condensed consolidated financial statements include the accounts of AAG and its wholly-owned subsidiaries. AAG’s principal subsidiary is American Airlines, Inc. (American). All significant intercompany transactions have been eliminated. On December 9, 2013, a subsidiary of AMR Corporation (AMR) merged with and into US Airways Group, Inc. (US Airways Group), a Delaware corporation, which survived as a wholly-owned subsidiary of AAG, and AAG emerged from Chapter 11 (the Merger). Upon closing of the Merger and emergence from Chapter 11, AMR changed its name to American Airlines Group Inc. On December 30, 2015, in order to simplify AAG’s internal corporate structure, US Airways, Inc. (US Airways), a wholly-owned subsidiary of US Airways Group, merged with and into American, with American as the surviving corporation. Management believes that all adjustments necessary for the fair presentation of results, consisting of normally recurring items, have been included in the unaudited condensed consolidated financial statements for the interim periods presented. The preparation of financial statements in accordance with accounting principles generally accepted in the United States (GAAP) requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The most significant areas of judgment relate to passenger revenue recognition, impairment of goodwill, impairment of long-lived and intangible assets, the loyalty program, valuation allowance for deferred tax assets, as well as pension and retiree medical and other postretirement benefits. Certain prior period amounts have been reclassified to conform to the current year presentation.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Revenue In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2014-09, “Revenue from Contracts with Customers (Topic 606).” ASU 2014-09 completes the joint effort by the FASB and International Accounting Standards Board (IASB) to improve financial reporting by creating common revenue recognition guidance for GAAP and International Financial Reporting Standards (IFRS). Subsequently, the FASB has issued several additional ASUs to clarify the implementation. The new revenue standard applies to all companies that enter into contracts with customers to transfer goods or services and is effective for public entities for interim and annual reporting periods beginning after December 15, 2017. We will adopt the new revenue standard effective January 1, 2018. Entities have the choice to apply the new revenue standard either retrospectively to each reporting period presented or by recognizing the cumulative effect of applying the new revenue standard at the date of initial application and not adjusting comparative information. We will adopt the new revenue standard using the full retrospective method. We are in the process of finalizing how the application of the new revenue standard will impact our condensed consolidated financial statements. We currently expect that the new revenue standard will materially impact our liability for outstanding mileage credits earned by AAdvantage loyalty program members. We currently use the incremental cost method to account for this portion of our loyalty program liability, which values these mileage credits based on the estimated incremental cost of carrying one additional passenger. The new revenue standard will require us to change our policy and apply a relative selling price approach whereby a portion of each passenger ticket sale attributable to mileage credits earned will be deferred and recognized in passenger revenue upon future mileage redemption. The carrying value of the earned mileage credits recognized in loyalty program liability is expected to be materially greater under the relative selling price approach than the value attributed to these mileage credits under the incremental cost method. The new revenue standard will also require us to reclassify certain ancillary fees to passenger revenue, which are currently included within other operating revenue. See Part I, Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations - “Recent Accounting Pronouncements” for our preliminary assessment of the quantitative impacts of the new revenue standard on our consolidated financial statements. Leases In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842).” ASU 2016-02 requires lessees to recognize a lease liability and a right-of-use asset on the balance sheet and aligns many of the underlying principles of the new lessor model with those in Accounting Standards Codification Topic 606, Revenue from Contracts with Customers. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. We expect we will adopt the new lease standard effective January 1, 2019. Entities are required to adopt the new lease standard using a modified retrospective approach for all leases existing at or commencing after the date of initial application with an option to use certain practical expedients. We are currently evaluating how the adoption of the new lease standard will impact our condensed consolidated financial statements. Interpretations are on-going and could have a material impact on our implementation. Currently, we expect that the adoption of the new lease standard will have a material impact on our condensed consolidated balance sheet due to the recognition of right-of-use assets and lease liabilities principally for certain leases currently accounted for as operating leases. Statement of Cash Flows In November 2016, the FASB issued ASU 2016-18, “Statement of Cash Flows (Topic 230): Restricted Cash.” ASU 2016-18 requires that the change in total cash, cash at beginning of period and cash at end of period on the statement of cash flows include restricted cash and restricted cash equivalents. ASU 2016-18 also requires companies who report cash and restricted cash separately on the balance sheet to reconcile those amounts to the statement of cash flows. This standard is to be applied retrospectively to each period presented and is effective for public entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. We expect we will adopt this new standard effective January 1, 2018. This standard is not expected to have a material impact on our condensed consolidated financial statements. Retirement Benefits In March 2017, the FASB issued ASU 2017-07, “Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.” ASU 2017-07 requires an entity to present the service cost component of net benefit cost in the income statement line items where it reports compensation cost. Entities will present all other components of net benefit cost outside of operating income, if this subtotal is presented. This standard is to be applied retrospectively to each period presented and is effective for public entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. We will adopt this standard on January 1, 2018. The new standard will require all components of our net periodic benefit cost (income), with the exception of service cost, currently reported within operating expenses as salaries, wages and benefits, to be reclassified and reported within nonoperating income (expense). The adoption of this new standard will have no impact on pre-tax income or net income reported. See Note 8 for our current components of net periodic benefit cost (income). Financial Instruments In January 2016, the FASB issued ASU 2016-01, “Financial Instruments - Overall (Subtopic 825-10)." ASU 2016-01 makes several modifications to Subtopic 825-10, including the elimination of the available-for-sale classification of equity investments, and it requires equity investments with readily determinable fair values to be measured at fair value with changes in fair value recognized in net income. ASU 2016-01 is effective for interim and annual periods beginning after December 15, 2017. We will adopt this standard on January 1, 2018. Based on our portfolio of investments as of September 30, 2017, we do not expect the adoption of ASU 2016-01 to have a material impact on our condensed consolidated financial statements.
American Airlines, Inc. [Member]
Basis of Presentation	The accompanying unaudited condensed consolidated financial statements of American Airlines, Inc. (American) should be read in conjunction with the consolidated financial statements contained in American’s Annual Report on Form 10-K for the year ended December 31, 2016. American is the principal wholly-owned subsidiary of American Airlines Group Inc. (AAG). All significant intercompany transactions have been eliminated. On December 9, 2013, a subsidiary of AMR Corporation (AMR) merged with and into US Airways Group, Inc. (US Airways Group), a Delaware corporation, which survived as a wholly-owned subsidiary of AAG, and AAG emerged from Chapter 11 (the Merger). Upon closing of the Merger and emergence from Chapter 11, AMR changed its name to American Airlines Group Inc. On December 30, 2015, in order to simplify AAG’s internal corporate structure, US Airways, Inc. (US Airways), a wholly-owned subsidiary of US Airways Group, merged with and into American, with American as the surviving corporation. Management believes that all adjustments necessary for the fair presentation of results, consisting of normally recurring items, have been included in the unaudited condensed consolidated financial statements for the interim periods presented. The preparation of financial statements in accordance with accounting principles generally accepted in the United States (GAAP) requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The most significant areas of judgment relate to passenger revenue recognition, impairment of goodwill, impairment of long-lived and intangible assets, the loyalty program, valuation allowance for deferred tax assets, as well as pension and retiree medical and other postretirement benefits. Certain prior period amounts have been reclassified to conform to the current year presentation.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Revenue In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2014-09, “Revenue from Contracts with Customers (Topic 606).” ASU 2014-09 completes the joint effort by the FASB and International Accounting Standards Board (IASB) to improve financial reporting by creating common revenue recognition guidance for GAAP and International Financial Reporting Standards (IFRS). Subsequently, the FASB has issued several additional ASUs to clarify the implementation. The new revenue standard applies to all companies that enter into contracts with customers to transfer goods or services and is effective for public entities for interim and annual reporting periods beginning after December 15, 2017. American will adopt the new revenue standard effective January 1, 2018. Entities have the choice to apply the new revenue standard either retrospectively to each reporting period presented or by recognizing the cumulative effect of applying the new revenue standard at the date of initial application and not adjusting comparative information. American will adopt the new revenue standard using the full retrospective method. American is in the process of finalizing how the application of the new revenue standard will impact its condensed consolidated financial statements. American currently expects that the new revenue standard will materially impact its liability for outstanding mileage credits earned by AAdvantage loyalty program members. American currently uses the incremental cost method to account for this portion of its loyalty program liability, which values these mileage credits based on the estimated incremental cost of carrying one additional passenger. The new revenue standard will require American to change its policy and apply a relative selling price approach whereby a portion of each passenger ticket sale attributable to mileage credits earned will be deferred and recognized in passenger revenue upon future mileage redemption. The carrying value of the earned mileage credits recognized in loyalty program liability is expected to be materially greater under the relative selling price approach than the value attributed to these mileage credits under the incremental cost method. The new revenue standard will also require American to reclassify certain ancillary fees to passenger revenue, which are currently included within other operating revenue. See Part I, Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations - “Recent Accounting Pronouncements” for American's preliminary assessment of the quantitative impacts of the new revenue standard on its consolidated financial statements. Leases In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842).” ASU 2016-02 requires lessees to recognize a lease liability and a right-of-use asset on the balance sheet and aligns many of the underlying principles of the new lessor model with those in Accounting Standards Codification Topic 606, Revenue from Contracts with Customers. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. American expects to adopt the new lease standard effective January 1, 2019. Entities are required to adopt the new lease standard using a modified retrospective approach for all leases existing at or commencing after the date of initial application with an option to use certain practical expedients. American is currently evaluating how the adoption of the new lease standard will impact its condensed consolidated financial statements. Interpretations are on-going and could have a material impact on American’s implementation. Currently, American expects that the adoption of the new lease standard will have a material impact on its condensed consolidated balance sheet due to the recognition of right-of-use assets and lease liabilities principally for certain leases currently accounted for as operating leases. Statement of Cash Flows In November 2016, the FASB issued ASU 2016-18, “Statement of Cash Flows (Topic 230): Restricted Cash.” ASU 2016-18 requires that the change in total cash, cash at beginning of period and cash at end of period on the statement of cash flows include restricted cash and restricted cash equivalents. ASU 2016-18 also requires companies who report cash and restricted cash separately on the balance sheet to reconcile those amounts to the statement of cash flows. This standard is to be applied retrospectively to each period presented and is effective for public entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. American expects to adopt this new standard effective January 1, 2018. This standard is not expected to have a material impact on American’s condensed consolidated financial statements. Retirement Benefits In March 2017, the FASB issued ASU 2017-07, “Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.” ASU 2017-07 requires an entity to present the service cost component of net benefit cost in the income statement line items where it reports compensation cost. Entities will present all other components of net benefit cost outside of operating income, if this subtotal is presented. This standard is to be applied retrospectively to each period presented and is effective for public entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. American will adopt this standard on January 1, 2018. The new standard will require all components of American’s net periodic benefit cost (income), with the exception of service cost, currently reported within operating expenses as salaries, wages and benefits, to be reclassified and reported within nonoperating income (expense). The adoption of this new standard will have no impact on pre-tax income or net income reported. See Note 6 for American’s current components of net periodic benefit cost (income). Financial Instruments In January 2016, the FASB issued ASU 2016-01, “Financial Instruments - Overall (Subtopic 825-10)." ASU 2016-01 makes several modifications to Subtopic 825-10, including the elimination of the available-for-sale classification of equity investments, and it requires equity investments with readily determinable fair values to be measured at fair value with changes in fair value recognized in net income. ASU 2016-01 is effective for interim and annual periods beginning after December 15, 2017. American will adopt this standard on January 1, 2018. Based on American's portfolio of investments as of September 30, 2017, it does not expect the adoption of ASU 2016-01 to have a material impact on its condensed consolidated financial statements.