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Fair Value Measurements - Summary of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | $ 7,000.0 | $ 8,525.0
Restricted short-term investments, noncurrent | 218.0 |
Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 7,000.0 | 8,525.0
Restricted cash and short-term investments | 910.0 | 995.0
Long-term investments | 163.0 | 245.0
Total | 8,073.0 | 9,765.0
Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 818.0 | 732.0
Restricted cash and short-term investments | 459.0 | 535.0
Long-term investments | 163.0 | 245.0
Total | 1,440.0 | 1,512.0
Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 6,182.0 | 7,793.0
Restricted cash and short-term investments | 451.0 | 460.0
Long-term investments | 0.0 | 0.0
Total | 6,633.0 | 8,253.0
Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 | 0.0
Restricted cash and short-term investments | 0.0 | 0.0
Long-term investments | 0.0 | 0.0
Total | 0.0 | 0.0
Recurring | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 818.0 | 732.0
Recurring | Money market funds | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 818.0 | 732.0
Recurring | Money market funds | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 | 0.0
Recurring | Money market funds | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 | 0.0
Recurring | Corporate obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 4,046.0 | 3,688.0
Recurring | Corporate obligations | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 | 0.0
Recurring | Corporate obligations | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 4,046.0 | 3,688.0
Recurring | Corporate obligations | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 | 0.0
Recurring | Bank notes/certificates of deposit/time deposits |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 1,586.0 | 3,655.0
Recurring | Bank notes/certificates of deposit/time deposits | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 | 0.0
Recurring | Bank notes/certificates of deposit/time deposits | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 1,586.0 | 3,655.0
Recurring | Bank notes/certificates of deposit/time deposits | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 | 0.0
Recurring | Repurchase agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 450.0 | 450.0
Recurring | Repurchase agreements | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 | 0.0
Recurring | Repurchase agreements | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 450.0 | 450.0
Recurring | Repurchase agreements | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 | 0.0
Recurring | U.S. government and agency obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 100.0 |
Recurring | U.S. government and agency obligations | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 |
Recurring | U.S. government and agency obligations | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 100.0 |
Recurring | U.S. government and agency obligations | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 |
American Airlines, Inc. |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 6,998.0 | 8,523.0
Restricted short-term investments, noncurrent | 218.0 |
American Airlines, Inc. | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 6,998.0 | 8,523.0
Restricted cash and short-term investments | 910.0 | 995.0
Long-term investments | 163.0 | 245.0
Total | 8,071.0 | 9,763.0
American Airlines, Inc. | Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 817.0 | 731.0
Restricted cash and short-term investments | 459.0 | 535.0
Long-term investments | 163.0 | 245.0
Total | 1,439.0 | 1,511.0
American Airlines, Inc. | Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 6,181.0 | 7,792.0
Restricted cash and short-term investments | 451.0 | 460.0
Long-term investments | 0.0 | 0.0
Total | 6,632.0 | 8,252.0
American Airlines, Inc. | Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 | 0.0
Restricted cash and short-term investments | 0.0 | 0.0
Long-term investments | 0.0 | 0.0
Total | 0.0 | 0.0
American Airlines, Inc. | Recurring | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 817.0 | 731.0
American Airlines, Inc. | Recurring | Money market funds | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 817.0 | 731.0
American Airlines, Inc. | Recurring | Money market funds | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 | 0.0
American Airlines, Inc. | Recurring | Money market funds | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 | 0.0
American Airlines, Inc. | Recurring | Corporate obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 4,046.0 | 3,688.0
American Airlines, Inc. | Recurring | Corporate obligations | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 | 0.0
American Airlines, Inc. | Recurring | Corporate obligations | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 4,046.0 | 3,688.0
American Airlines, Inc. | Recurring | Corporate obligations | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 | 0.0
American Airlines, Inc. | Recurring | Bank notes/certificates of deposit/time deposits |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 1,585.0 | 3,654.0
American Airlines, Inc. | Recurring | Bank notes/certificates of deposit/time deposits | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 | 0.0
American Airlines, Inc. | Recurring | Bank notes/certificates of deposit/time deposits | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 1,585.0 | 3,654.0
American Airlines, Inc. | Recurring | Bank notes/certificates of deposit/time deposits | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 | 0.0
American Airlines, Inc. | Recurring | Repurchase agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 450.0 | 450.0
American Airlines, Inc. | Recurring | Repurchase agreements | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 | 0.0
American Airlines, Inc. | Recurring | Repurchase agreements | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 450.0 | 450.0
American Airlines, Inc. | Recurring | Repurchase agreements | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 | $ 0.0
American Airlines, Inc. | Recurring | U.S. government and agency obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 100.0 |
American Airlines, Inc. | Recurring | U.S. government and agency obligations | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 |
American Airlines, Inc. | Recurring | U.S. government and agency obligations | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 100.0 |
American Airlines, Inc. | Recurring | U.S. government and agency obligations | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | $ 0.0 |

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