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The COVID-19 Pandemic (Details) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 15, 2021 | Dec. 04, 2020 | Sep. 30, 2020 | Apr. 23, 2020 | Oct. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 03, 2020 | Sep. 29, 2020 | Apr. 22, 2020
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in revenue, percent |  |  |  |  |  |  | (63.50%) |  |  |  |  |
Change in capacity, percent |  |  |  |  |  |  | 48.80% |  |  |  |  |
Long-term debt, term |  |  |  |  |  |  | 364 years |  |  |  |  |
Loyalty points, pre-purchase arrangement |  |  |  |  |  |  | $ 150,000,000 |  |  |  |  |
Reduction in aircraft capital expenditures through 2022, relating to airbus purchase agreement amendment |  |  |  |  | $ 2,000,000,000.0 |  |  |  |  |  |  |
CARES act, payroll support program, total payment |  |  | $ 27,000,000 | $ 936,000,000 |  | $ 27,000,000 | 963,000,000 |  |  |  |  |
Proceeds from sale leaseback transactions |  |  |  |  |  |  | 563,000,000 |  |  |  |  |
CARES act, secured loans, eligibility amount |  |  |  |  |  |  | 1,900,000,000 |  |  | $ 1,900,000,000 |  |
Proceeds from issuance of common stock |  |  |  |  |  |  | 620,000,000 | $ 51,000,000 | $ 48,000,000 |  |  |
Cash, cash equivalents, and short-term investments |  |  |  |  |  |  | 3,100,000,000 |  |  |  |  |
Proceeds from sale-leaseback transactions |  |  |  |  |  |  | 354,000,000 | 0 | 0 |  |  |
Proceeds from sale-leaseback transactions |  |  |  |  |  |  | 209,000,000 | 0 | 0 |  |  |
Losses on sale-leaseback transactions |  |  |  |  |  |  | (106,000,000) | 0 | 0 |  |  |
Fleet impairment |  |  |  |  |  |  | 273,000,000 | $ 0 | $ 0 |  |  |
CARES act, payroll support program, grant |  |  | $ 19,000,000 | $ 685,000,000 |  | $ 19,000,000 | $ 704,000,000 |  |  |  |  |
Class of warrant or right, outstanding (in shares) |  |  | 85,540 | 2,600,000 |  | 85,540 | 85,540 |  |  |  | 1,200,000 |
Class of warrant or right, exercise price of warrants or rights (in dollars per share) |  |  |  | $ 9.50 |  |  | $ 9.50 |  |  |  | $ 9.50 |
Warrants and rights outstanding, term |  |  |  | 5 years |  |  |  |  |  |  |  |
Warrants and rights outstanding |  |  |  |  |  |  | $ 19,000,000 |  |  |  |  |
CARES act, payroll support program, grant, carrying value, total |  |  |  |  |  |  | $ 685,000,000 |  |  |  |  |
CARES act, class of warrant or right, expected (in shares) |  |  |  |  |  |  | 20,500,000 |  |  |  |  |
CARES act initial drawing amount |  |  |  |  |  |  |  |  |  |  | $ 115,000,000 |
Remaining borrowing capacity |  |  |  |  |  |  | $ 1,800,000,000 |  |  |  |  |
CARES act, payroll tax deferral |  |  |  |  |  |  | 48,000,000 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares, new issues (in shares) |  | 42,000,000 |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  | 583,000,000 |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, outstanding (in shares) | 316,583 |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, exercise price of warrants or rights (in dollars per share) | $ 14.43 |  |  |  |  |  |  |  |  |  |  |
CARES act, payroll support program, grant, carrying value, total | $ 206,000,000 |  |  |  |  |  |  |  |  |  |  |
Treasury payment | 252,000,000 |  |  |  |  |  |  |  |  |  |  |
CARES act, payroll support program, grant, loan amount | 46,000,000 |  |  |  |  |  |  |  |  |  |  |
CARES act, payroll support program, grant, carrying value, total 1 | 252,000,000 |  |  |  |  |  |  |  |  |  |  |
CARES act, payroll support program, grant, loan amount 1 | $ 76,000,000 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 923,000,000 |  |  |  |  |
Long-term Debt | Airbus A321 |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft, secured debt transactions |  |  |  |  |  |  | 49 |  |  |  |  |
Morgan Stanley | Short-term Debt |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 1,000,000,000.0 |  |  |  |  |
Citibank | Citibank line of credit, due through 2023 | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, current |  |  |  |  |  |  | 550,000,000 |  |  |  |  | $ 550,000,000
Barclays | Floating rate term loan credit facility, due through 2024 | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | 750,000,000 |  |  |  |  |
US Department of Treasury | Secured CARES Act Loan, due through 2025 | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 115,000,000 |  |  |  | $ 115,000,000 |
US Department of Treasury | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 8,000,000 | $ 251,000,000 |  | $ 8,000,000 |  |  |  |  |  |
Long-term debt, term |  |  |  | 10 years |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  | 1.00% |  |  |  |  |  |  |  |
US Department of Treasury | Unsecured Debt | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  | 2.00% |  |  |  |  |  |  |  |

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