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Investments - Narrative (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |
Unrealized gain on investments, net | $ 100,000,000 | $ 18,000,000
Grupo Aeromexico |  |
Schedule of Equity Method Investments [Line Items] |  |
Voting interest limit per bylaws (percent) | 49.00% |
Equity method investment, ownership percentage | 51.00% |
Equity method investment | $ 864,000,000 |
Virgin Atlantic |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 49.00% |
Equity method investment | $ 356,000,000 |
New DGS |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 49.00% |
Equity method investment | $ 111,000,000 |
Air France-KLM | Joint Venture |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity interests, ownership percentage | 9.00% |
Air France-KLM | Common stock |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity interests | $ 422,000,000 |
GOL |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity interests, ownership percentage | 9.00% |
GOL | Preferred stock |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity interests | $ 217,000,000 |
China Eastern |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity interests, ownership percentage | 3.00% |
Equity interests | $ 331,000,000 |
CLEAR |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity interests, ownership percentage | 7.00% |
Republic Airways |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity interests, ownership percentage | 17.00% |
Financial Guarantee | Term loan facility |  |
Schedule of Equity Method Investments [Line Items] |  |
Guarantee borrowings on third party debt | $ 300,000,000 |
Guarantee borrowings on third party debt, term (in years) | 5 years |

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