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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (AOCI) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
AOCI tax, attributable to parent [Roll Forward] |  |  |
Beginning balance, tax | $ (1,601) | $ (1,204) |
Other comprehensive income (loss) before reclassifications, tax | 108 | (365) |
Amounts reclassified from AOCI, tax | (19) | (32) |
Net current-period other comprehensive income (loss), tax | 89 | (397) |
Ending balance, tax | (1,512) | (1,601) | $ (1,204)
AOCI attributable to parent, net of tax [Roll Forward] |  |  |
Beginning balance, net of tax | (4,585) | (5,942) |
Other comprehensive income (loss) before reclassifications, net of tax | (374) | 1,249 |
Amounts reclassified from AOCI, net of tax | 65 | 108 |
Total other comprehensive income (loss), net of tax | (309) | 1,357 | 1,161
Ending balance, net of tax | (4,894) | (4,585) | (5,942)
Pension, Retiree Medical and Other Postretirement Benefits |  |  |
AOCI attributable to parent, before tax [Roll Forward] |  |  |
Beginning balance, before tax | (2,978) | (4,736) |
Other comprehensive income (loss) before reclassifications, before tax | (486) | 1,618 |
Amounts reclassified from AOCI, before tax | 84 | 140 |
Net current-period other comprehensive income (loss), before tax | (402) | 1,758 |
Ending balance, before tax | (3,380) | (2,978) | (4,736)
Unrealized Gain (Loss) on Investments |  |  |
AOCI attributable to parent, before tax [Roll Forward] |  |  |
Beginning balance, before tax | (6) | (2) |
Other comprehensive income (loss) before reclassifications, before tax | 4 | (4) |
Amounts reclassified from AOCI, before tax | 0 | 0 |
Net current-period other comprehensive income (loss), before tax | 4 | (4) |
Ending balance, before tax | (2) | (6) | (2)
American Airlines, Inc. |  |  |
AOCI tax, attributable to parent [Roll Forward] |  |  |
Beginning balance, tax | (1,710) | (1,315) |
Other comprehensive income (loss) before reclassifications, tax | 108 | (363) |
Amounts reclassified from AOCI, tax | (19) | (32) |
Net current-period other comprehensive income (loss), tax | 89 | (395) |
Ending balance, tax | (1,621) | (1,710) | (1,315)
AOCI attributable to parent, net of tax [Roll Forward] |  |  |
Beginning balance, net of tax | (4,690) | (6,041) |
Other comprehensive income (loss) before reclassifications, net of tax | (374) | 1,243 |
Amounts reclassified from AOCI, net of tax | 65 | 108 |
Total other comprehensive income (loss), net of tax | (309) | 1,351 | 1,153
Ending balance, net of tax | (4,999) | (4,690) | (6,041)
American Airlines, Inc. | Pension, Retiree Medical and Other Postretirement Benefits |  |  |
AOCI attributable to parent, before tax [Roll Forward] |  |  |
Beginning balance, before tax | (2,974) | (4,724) |
Other comprehensive income (loss) before reclassifications, before tax | (486) | 1,610 |
Amounts reclassified from AOCI, before tax | 84 | 140 |
Net current-period other comprehensive income (loss), before tax | (402) | 1,750 |
Ending balance, before tax | (3,376) | (2,974) | (4,724)
American Airlines, Inc. | Unrealized Gain (Loss) on Investments |  |  |
AOCI attributable to parent, before tax [Roll Forward] |  |  |
Beginning balance, before tax | (6) | (2) |
Other comprehensive income (loss) before reclassifications, before tax | 4 | (4) |
Amounts reclassified from AOCI, before tax | 0 | 0 |
Net current-period other comprehensive income (loss), before tax | 4 | (4) |
Ending balance, before tax | $ (2) | $ (6) | $ (2)

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