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%