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Investments - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Aug. 15, 2023
Schedule of Equity Method Investments [Line Items] |  |  |  |
Gain on investments, net | $ 1,263,000,000 | $ (783,000,000) | $ 56,000,000 |
Virgin Atlantic |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Carrying value of equity investment | $ 0 |  |  |
Ownership Interest | 49.00% |  |  |
Unrecognized equity method losses | $ 400,000,000 |  |  |
Wheels Up |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Liquidity threshold | $ 100,000,000 |  |  |
Ownership Interest | 38.00% | 21.00% |  |
Voting rights, shares held threshold | 29.90% |  |  |
Gain on investments, net | $ 786,000,000 |  |  |
Public float percentage | 5.00% |  |  |
Wheels Up | Line of Credit | Delta |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Purchasing card maximum limit | $ 100,000,000 |  |  | $ 100,000,000
Line of credit |  |  |  | $ 0
Wheels Up | Line of Credit | Secured Debt |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Debt instrument amount | 390,000,000 |  |  |
Wheels Up | Line of Credit | Secured Debt | Delta |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Debt instrument amount | 150,000,000 |  |  |
Wheels Up | Line of Credit | Secured Debt | Other Investors |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Debt instrument amount | $ 240,000,000 |  |  |
Wheels Up |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity issuable | 95.00% |  |  |

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