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Accumulated Other Comprehensive Loss - Components of AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Tax |  |  |  |  |  |  |  |
Beginning balance, tax |  |  | $ (1,512) |  |  |  | $ (1,512) |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  | (1) |
Amounts reclassified from AOCI |  |  |  |  |  |  | (16) |
Net current-period other comprehensive income (loss) |  |  |  |  |  |  | (17) |
Ending balance, tax | $ (1,529) |  |  |  |  |  | (1,529) |
Net of tax |  |  |  |  |  |  |  |
Beginning balance, net of tax |  |  | (4,894) |  |  |  | (4,894) |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  | 4 |
Amounts reclassified from AOCI |  |  |  |  |  |  | 55 |
Total other comprehensive income (loss), net of tax | 23 | $ 19 | 17 | $ (238) | $ 17 | $ 18 | 59 | $ (203)
Ending balance, net of tax | (4,835) |  |  |  |  |  | (4,835) |
Total | (4,835) |  |  |  |  |  | (4,835) |
American Airlines, Inc. |  |  |  |  |  |  |  |
Tax |  |  |  |  |  |  |  |
Beginning balance, tax |  |  | (1,621) |  |  |  | (1,621) |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  | (1) |
Amounts reclassified from AOCI |  |  |  |  |  |  | (16) |
Net current-period other comprehensive income (loss) |  |  |  |  |  |  | (17) |
Ending balance, tax | (1,638) |  |  |  |  |  | (1,638) |
Net of tax |  |  |  |  |  |  |  |
Beginning balance, net of tax |  |  | (4,999) |  |  |  | (4,999) |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  | 4 |
Amounts reclassified from AOCI |  |  |  |  |  |  | 55 |
Total other comprehensive income (loss), net of tax | 23 | $ 19 | 17 | $ (238) | $ 17 | $ 18 | 59 | $ (203)
Ending balance, net of tax | (4,940) |  |  |  |  |  | (4,940) |
Total | (4,940) |  |  |  |  |  | (4,940) |
Pension, Retiree Medical and Other Postretirement Benefits |  |  |  |  |  |  |  |
Before tax |  |  |  |  |  |  |  |
Beginning balance, before tax |  |  | (3,380) |  |  |  | (3,380) |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  | 0 |
Amounts reclassified from AOCI |  |  |  |  |  |  | 71 |
Net current-period other comprehensive income (loss) |  |  |  |  |  |  | 71 |
Ending balance, before tax | (3,309) |  |  |  |  |  | (3,309) |
Pension, Retiree Medical and Other Postretirement Benefits | American Airlines, Inc. |  |  |  |  |  |  |  |
Before tax |  |  |  |  |  |  |  |
Beginning balance, before tax |  |  | (3,376) |  |  |  | (3,376) |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  | 0 |
Amounts reclassified from AOCI |  |  |  |  |  |  | 71 |
Net current-period other comprehensive income (loss) |  |  |  |  |  |  | 71 |
Ending balance, before tax | (3,305) |  |  |  |  |  | (3,305) |
Unrealized Gain (Loss) on Investments |  |  |  |  |  |  |  |
Before tax |  |  |  |  |  |  |  |
Beginning balance, before tax |  |  | (2) |  |  |  | (2) |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  | 5 |
Amounts reclassified from AOCI |  |  |  |  |  |  | 0 |
Net current-period other comprehensive income (loss) |  |  |  |  |  |  | 5 |
Ending balance, before tax | 3 |  |  |  |  |  | 3 |
Unrealized Gain (Loss) on Investments | American Airlines, Inc. |  |  |  |  |  |  |  |
Before tax |  |  |  |  |  |  |  |
Beginning balance, before tax |  |  | $ (2) |  |  |  | (2) |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  | 5 |
Amounts reclassified from AOCI |  |  |  |  |  |  | 0 |
Net current-period other comprehensive income (loss) |  |  |  |  |  |  | 5 |
Ending balance, before tax | $ 3 |  |  |  |  |  | $ 3 |

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