Investments - Equity Method Investments (Details) - USD ($) $ in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Grupo Aeromexico | ||
| Equity Method Investments | ||
| Ownership interest (percent) | 51.00% | 51.00% |
| Carrying value | $ 833 | $ 897 |
| Voting interest limit per bylaws (percent) | 49.00% | |
| Virgin Atlantic Limited | ||
| Equity Method Investments | ||
| Ownership interest (percent) | 49.00% | 49.00% |
| Carrying value | $ 375 | $ 383 |
| AirCo | ||
| Equity Method Investments | ||
| Ownership interest (percent) | 49.00% | 49.00% |
| Carrying value | $ 142 | $ 109 |