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Loss Per Share - Summary of Warrants Outstanding (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021
Class of Warrant or Right [Line Items] |  |
Number of shares of common stock (in shares) | 10.0 |
PSP1 Note | Unsecured Debt |  |
Class of Warrant or Right [Line Items] |  |
Face amount | $ 1,500 |
Term of debt | 10 years |
PSP1 Warrants |  |
Class of Warrant or Right [Line Items] |  |
Number of shares of common stock (in shares) | 4.8 |
Exercise price (in dollars per share) | $ 31.50 |
CARES Act Loan Warrants |  |
Class of Warrant or Right [Line Items] |  |
Number of shares of common stock (in shares) | 1.7 |
Exercise price (in dollars per share) | $ 31.50 |
PSP2 Warrants |  |
Class of Warrant or Right [Line Items] |  |
Number of shares of common stock (in shares) | 2.0 |
Exercise price (in dollars per share) | $ 43.26 | $ 43.26
PSP3 Warrants |  |
Class of Warrant or Right [Line Items] |  |
Number of shares of common stock (in shares) | 1.5 |
Exercise price (in dollars per share) | $ 53.92 |

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