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Investments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Investments - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2021	Mar. 31, 2020
Investments [Line Items]
Gain/(loss) on investments, net	$ 262	$ (112)
Grupo Aeromexico, LATAM, and Virgin Atlantic
Investments [Line Items]
Receivable	480
Support for investee carriers
Investments [Line Items]
Notes payable	480
Grupo Aeromexico
Investments [Line Items]
Long-term investments	0
LATAM
Investments [Line Items]
Long-term investments	0
Virgin Atlantic
Investments [Line Items]
Long-term investments	$ 0