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Long-term Debt, Short-term Borrowings, and Finance Lease Obligations - Narrative (Details) |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |
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Sep. 30, 2020 USD ($) shares | Sep. 29, 2020 USD ($) $ / shares shares | Apr. 23, 2020 USD ($) $ / shares shares | Mar. 31, 2020 | Sep. 30, 2020 USD ($) shares | Dec. 31, 2020 USD ($) aircraft $ / shares shares | Dec. 31, 2019 USD ($) airbus aircraft | Dec. 31, 2018 USD ($) airbus | Jan. 15, 2021 $ / shares shares | Nov. 03, 2020 USD ($) | Aug. 31, 2020 USD ($) | Jun. 17, 2020 USD ($) | Apr. 22, 2020 USD ($) | Nov. 30, 2019 USD ($) aircraft | Aug. 31, 2019 USD ($) | Mar. 30, 2014 USD ($) aircraft | Apr. 30, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CARES act, secured loans, eligibility amount |  |  |  |  |  | $ 1,900,000,000 |  |  |  | $ 1,900,000,000 |  |  |  |  |  |  |
CARES act, class of warrant or right, expected (in shares) | shares |  |  |  |  |  | 20,500,000 |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, outstanding (in shares) | shares | 85,540 | 1,200,000 | 2,600,000 |  | 85,540 | 85,540 |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, exercise price of warrants or rights (in dollars per share) | $ / shares |  | $ 9.50 | $ 9.50 |  |  | $ 9.50 |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  |  |  |  | $ 1,800,000,000 |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  |  | 550,000,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale leaseback transactions |  |  |  |  |  | 563,000,000 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Finance lease assets |  |  |  |  |  | 131,000,000 | 171,000,000 |  |  |  |  |  |  |  |  |  |
Finance lease, right-of-use asset, accumulated amortization |  |  |  |  |  | 54,000,000 | 80,000,000 |  |  |  |  |  |  |  |  |  |
2021 |  |  |  |  |  | 40,000,000 |  |  |  |  |  |  |  |  |  |  |
2022 |  |  |  |  |  | 11,000,000 |  |  |  |  |  |  |  |  |  |  |
2023 |  |  |  |  |  | 11,000,000 |  |  |  |  |  |  |  |  |  |  |
2024 |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |
Finance lease, liability, undiscounted excess amount |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |
Present value of future minimum lease payment |  |  |  |  |  | 63,000,000 | 89,000,000 |  |  |  |  |  |  |  |  |  |
Finance lease liabilities |  |  |  |  |  | 37,000,000 | 31,000,000 |  |  |  |  |  |  |  |  |  |
Finance lease liabilities |  |  |  |  |  | 26,000,000 | 58,000,000 |  |  |  |  |  |  |  |  |  |
CARES act, payroll support program, total payment | $ 27,000,000 |  | $ 936,000,000 |  | $ 27,000,000 | 963,000,000 |  |  |  |  |  |  |  |  |  |  |
CARES act, payroll support program, grant | 19,000,000 |  | 685,000,000 |  | 19,000,000 | 704,000,000 |  |  |  |  |  |  |  |  |  |  |
Pledged assets not separately reported flight equipment |  |  |  |  |  | 6,900,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest paid, including capitalized interest, operating and investing activities |  |  |  |  |  | $ 128,000,000 | $ 62,000,000 | 59,000,000 |  |  |  |  |  |  |  |  |
Term loan percentage |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, outstanding (in shares) | shares |  |  |  |  |  |  |  |  | 316,583 |  |  |  |  |  |  |  |
Class of warrant or right, exercise price of warrants or rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 14.43 |  |  |  |  |  |  |  |
A-320-200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finance lease, number of aircraft leases | aircraft |  |  |  |  |  | 2 | 4 |  |  |  |  |  |  |  |  |  |
A-321-200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finance lease, number of aircraft leases | aircraft |  |  |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |
A-320 and A-321 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finance lease assets |  |  |  |  |  | $ 188,000,000 | $ 250,000,000 |  |  |  |  |  |  |  |  |  |
2021 |  |  |  |  |  | 40,000,000 |  |  |  |  |  |  |  |  |  |  |
2022 |  |  |  |  |  | 11,000,000 |  |  |  |  |  |  |  |  |  |  |
2023 |  |  |  |  |  | 11,000,000 |  |  |  |  |  |  |  |  |  |  |
2024 |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |
Thereafter |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Fixed rate enhanced equipment notes, due through 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 226,000,000 |
Fixed rate equipment notes, due through 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 219,000,000 | 567,000,000 |  |  |  |  |  |  |  |  |
Floating rate equipment notes, due through 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 120,000,000 |  |  |  |  |  |  |  |  |
Fixed rate specialty bonds, due through 2036 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 42,000,000
Debt instrument, net amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,000,000
Debt instrument, unamortized premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 923,000,000 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt | Airbus A321 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft, secured debt transactions |  |  |  |  |  | 49 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt | Fixed rate enhanced equipment notes, 2020-1A and B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | $ 808,000,000 |  |  | $ 772,000,000 |  |  |
Long-term Debt | 2019-1 Series B, due through 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | $ 115,000,000 |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |
Long-term Debt | 2019-1 Series B, due through 2027 | Airbus A321 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft, secured debt transactions |  |  |  |  |  |  |  |  |  |  | 24 |  |  | 25 |  |  |
Long-term Debt | 2020-1 Series A, due through 2032 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | $ 636,000,000 |  |  | $ 589,000,000 |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  | 2.75% |  |  |
Long-term Debt | 2020-1 Series B, due through 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | $ 172,000,000 |  |  | $ 183,000,000 |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  | 7.75% |  |  | 2.95% |  |  |
Secured Debt | Fixed rate enhanced equipment notes, due through 2023 | A-320-200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new aircraft held as security | aircraft |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 |
Secured Debt | Fixed rate equipment notes, due through 2028 | A-320 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new aircraft held as security | airbus |  |  |  |  |  |  | 10 | 14 |  |  |  |  |  |  |  |  |
Secured Debt | Fixed rate equipment notes, due through 2028 | A-321 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new aircraft held as security | airbus |  |  |  |  |  |  | 2 | 10 |  |  |  |  |  |  |  |  |
Secured Debt | Floating rate equipment notes, due through 2028 | A-320 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new aircraft held as security | airbus |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |
Secured Debt | Floating rate equipment notes, due through 2028 | A-321 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new aircraft held as security | airbus |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Citibank | Line of Credit | Citibank line of credit, due through 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, current |  |  |  |  |  | $ 550,000,000 |  |  |  |  |  |  | $ 550,000,000 |  |  |  |
Citibank | Line of Credit | Citibank line of credit, due through 2023 | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, interest rate at period end |  |  |  |  |  | 2.20% |  |  |  |  |  |  |  |  |  |  |
US Department of Treasury | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 8,000,000 |  | $ 251,000,000 |  | $ 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
US Department of Treasury | Long-term Debt | Secured CARES Act Loan, due through 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 115,000,000 |  |  |  | $ 115,000,000 |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, collateral fees, amount |  |  |  |  |  | 550,000,000 |  |  |  |  |  |  |  |  |  |  |
Minimum collateral coverage ratio |  | 1.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
US Department of Treasury | Long-term Debt | Secured CARES Act Loan, due through 2025 | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Morgan Stanley |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |
Morgan Stanley | Short-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | 1,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility and Letter of Credit Facility | Morgan Stanley | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |
Barclays | Long-term Debt | Floating rate term loan credit facility, due through 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  | $ 750,000,000 |  |  |  |  |
Barclays | Long-term Debt | Floating rate term loan credit facility, due through 2024 | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  | 6.25% |  |  |  |  |  |  |  |  |  |  |
Morgan Stanley | Short-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  |  | 364 days |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | US Department of Treasury | Long-term Debt | Secured CARES Act Loan, due through 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Revolving Credit Facility and Letter of Credit Facility | Citibank | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 125,000,000 |  |
Maximum | US Department of Treasury | Long-term Debt | Secured CARES Act Loan, due through 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Revolving Credit Facility and Letter of Credit Facility | Citibank | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 550,000,000 |  |

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- Definition CARES Act, Payroll Support Program, Grant + References No definition available. + Details
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- Definition CARES Act, Payroll Support Program, Total Payment + References No definition available. + Details
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- Definition CARES Act, Secured Loans, Eligibility Amount + References No definition available. + Details
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- Definition Debt Instrument, Covenant, Collateral Coverage Ratio, Minimum + References No definition available. + Details
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- Definition Finance Lease, Liability, to be Paid, after Year Four + References No definition available. + Details
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- Definition Finance Lease, Number of Aircraft Leases + References No definition available. + Details
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- Definition Number of new aircraft held as security. + References No definition available. + Details
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- Definition The carrying amount, as of the date of the latest financial statement presented, of flight equipment which are owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References No definition available. + Details
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- Definition Proceeds from Sale Leaseback Transactions + References No definition available. + Details
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