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Loss Per Share - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Apr. 22, 2021 | Mar. 03, 2021 | Jun. 15, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Warrants recorded within stockholders' equity | $ 52 |  | $ 57 | $ 99 | $ 57 |  |  |
Proceeds from the issuance of common stock |  |  |  | $ 500 |  |  |  |
PSP3 |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of securities called by warrants (in shares) |  |  |  |  |  | 1,500,000 |  |
2020 ATM Offering |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares issuable (in shares) |  |  |  |  |  |  |  | 28,000,000
Number of shares issued (in shares) |  | 7,000,000 |  |  |  |  |  |
Sale price (in dollars per share) |  | $ 42.98 |  |  |  |  |  |
Proceeds from the issuance of common stock |  | $ 282 |  |  |  |  |  |
2021 ATM Offering |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares issuable (in shares) |  |  |  |  |  |  | 37,000,000 |
Number of shares issued (in shares) |  |  |  | 4,000,000 |  |  |  |
Sale price (in dollars per share) | $ 57.50 |  |  | $ 57.50 |  |  |  |
Proceeds from the issuance of common stock |  |  |  | $ 250 |  |  |  |
Payroll Support Program 2 (PSP2) Warrants |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Warrants to purchase securities (in shares) |  | 2,000,000.0 |  |  |  |  |  |
Warrant exercise price (in dollars per share) | 43.26 | $ 43.26 |  | $ 43.26 |  |  |  |
Warrant term |  | 5 years |  |  |  |  |  |
Warrants recorded within stockholders' equity |  | $ 56 |  |  |  |  |  |
PSP3 Warrants |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Warrant exercise price (in dollars per share) | $ 53.92 |  |  | $ 53.92 |  |  |  |
Warrant term | 5 years |  |  | 5 years |  |  |  |
Warrants recorded within stockholders' equity | $ 43 |  |  |  |  |  |  |

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