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Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Narrative (Details) $ / shares in Units, shares in Millions |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
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Apr. 29, 2021 USD ($) $ / shares shares | Jan. 15, 2021 $ / shares shares | Sep. 29, 2020 USD ($) $ / shares shares | Apr. 23, 2020 USD ($) $ / shares shares | Mar. 31, 2021 USD ($) trading_day $ / shares shares | Mar. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) | Nov. 03, 2020 USD ($) | Sep. 30, 2020 | Aug. 31, 2020 USD ($) airbus | Jun. 17, 2020 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reduction in outstanding debt and capital lease obligations |  |  |  |  |  | $ 644,000,000 |  |  |  |  |
Pledged assets not separately reported flight equipment |  |  |  |  | $ 6,800,000,000 | 6,800,000,000 |  |  |  |  |
CARES act, payroll support program, total payment |  |  |  | $ 963,000,000 |  | 504,000,000 |  |  |  |  |
CARES act, payroll support program, grant |  |  |  | $ 704,000,000 |  | 383,000,000 |  |  |  |  |
Class of warrant or right, outstanding (in shares) | shares |  | 0.8 | 1.2 | 2.7 |  |  |  |  |  |  |
Class of warrant or right, exercise price of warrants or rights (in dollars per share) | $ / shares |  | $ 14.43 | $ 9.50 | $ 9.50 |  |  |  |  |  |  |
Warrants and rights outstanding, term |  | 5 years |  | 5 years |  |  |  |  |  |  |
Warrants and rights outstanding |  |  |  |  | 8,000,000 | 8,000,000 |  |  |  |  |
CARES act, payroll support program, grant, carrying value, total |  |  |  |  | $ 375,000,000 | $ 375,000,000 |  |  |  |  |
CARES act, secured loans, eligibility amount |  |  |  |  |  |  |  | $ 1,900,000,000 |  |  |
CARES act, class of warrant or right, expected (in shares) | shares |  |  |  |  | 20.5 | 20.5 |  |  |  |  |
Line of credit facility, remaining borrowing capacity |  |  |  |  |  |  |  | $ 1,100,000,000 |  |  |
CARES act loan remaining outstanding amount |  |  |  |  | $ 115,000,000 | $ 115,000,000 |  |  |  |  |
Proceeds from sale leaseback transactions |  |  |  |  |  |  | $ 563,000,000 |  |  |  |
Proceeds from sale-leaseback transactions |  |  |  |  |  |  | 354,000,000 |  |  |  |
Proceeds from sale-leaseback transactions |  |  |  |  |  |  | 209,000,000 |  |  |  |
Sale and leaseback transaction, gain (loss), net |  |  |  |  |  |  | $ 106,000,000 |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
CARES act, payroll support program, total payment | $ 76,000,000 |  |  |  |  |  |  |  |  |  |
CARES act, payroll support program, grant | $ 53,000,000 |  |  |  |  |  |  |  |  |  |
Class of warrant or right, outstanding (in shares) | shares | 0.2 |  |  |  |  |  |  |  |  |  |
Class of warrant or right, exercise price of warrants or rights (in dollars per share) | $ / shares | $ 14.43 |  |  |  |  |  |  |  |  |  |
Unsecured Debt |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
CARES act, payroll support program, grant |  |  |  |  |  | 87,000,000 |  |  |  |  |
Warrants and rights outstanding |  |  |  |  | 19,000,000 | 19,000,000 |  |  |  |  |
CARES act, payroll support program, grant, carrying value, total |  |  |  |  | 685,000,000 | 685,000,000 |  |  |  |  |
Convertible Senior Notes Due 2026 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 750,000,000 | $ 750,000,000 |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  | 0.50% | 0.50% |  |  |  |  |
Proceeds from offering |  |  |  |  | $ 734,000,000 |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  |  |  | 0.0385802 |  |  |  |  |  |
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares |  |  |  |  | $ 25.92 | $ 25.92 |  |  |  |  |
Trading days | trading_day |  |  |  |  | 20 |  |  |  |  |  |
Convertible Senior Notes Due 2026 | Senior Notes | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  | 100.00% |  |  |  |  |  |
Convertible Senior Notes Due 2026 | Senior Notes | Debt Instrument, Redemption, Period Two |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  | 130.00% |  |  |  |  |  |
Fixed rate enhanced equipment notes, 2020-1A and B | Long-term Debt |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 808,000,000 |
Fixed rate enhanced equipment notes, 2020-1A and B | Long-term Debt | Airbus A321 |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Secured debt | airbus |  |  |  |  |  |  |  |  |  | 24 |
2020-1 Series A, due through 2032 | Long-term Debt |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 636,000,000 |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  | 4.00% |
2020-1 Series B, due through 2028 | Long-term Debt |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 172,000,000 |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  | 7.75% |
2019-1 Series B, due through 2027 | Long-term Debt |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 115,000,000 |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  | 8.00% |
2019-1 Series B, due through 2027 | Long-term Debt | Airbus A321 |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Secured debt | airbus |  |  |  |  |  |  |  |  |  | 25 |
US Department of Treasury | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 259,000,000 | $ 121,000,000 | $ 121,000,000 |  |  |  |  |
Debt instrument, interest rate, stated percentage |  | 1.00% |  | 1.00% |  |  |  |  |  |  |
Long-term debt, term |  |  |  | 10 years |  |  |  |  |  |  |
US Department of Treasury | Unsecured Debt | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 23,000,000 |  |  |  |  |  |  |  |  |  |
US Department of Treasury | Unsecured Debt | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  | 10 years |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.00% |  | 2.00% |  |  |  |  |  |  |
US Department of Treasury | Secured CARES Act Loan, due through 2025 | Long-term Debt |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, collateral fees, amount |  |  |  |  |  | $ 550,000,000 |  |  |  |  |
Barclays | Floating rate term loan credit facility, due through 2024 | Long-term Debt |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | $ 750,000,000
Debt instrument, interest rate, stated percentage |  |  |  |  | 6.25% | 6.25% |  |  |  |  |
Amortization payments, percentage |  |  |  |  |  |  |  |  | 5.00% |  |
US Department of Treasury | Secured CARES Act Loan, due through 2025 | Long-term Debt |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 115,000,000 |  |  |  |  |  |  |  |
Debt instrument covenant collateral coverage ratio minimum |  |  | 1.6 |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 1,100,000,000 |  |  |  |  |  |  |  |
US Department of Treasury | Secured CARES Act Loan, due through 2025 | Long-term Debt | Maximum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  | 1.00% |  |  |  |  |  |  |  |
US Department of Treasury | Secured CARES Act Loan, due through 2025 | Long-term Debt | Minimum |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  | 0.00% |  |  |  |  |  |  |  |
US Department of Treasury | Secured CARES Act Loan, due through 2025 | London Interbank Offered Rate (LIBOR) | Long-term Debt |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  | 2.75% |  |  |  |  |  |  |  |
Citibank | Citibank line of credit, due through 2023 | Line of Credit |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit, current |  |  |  |  | $ 550,000,000 | $ 550,000,000 |  |  |  |  |
Morgan Stanley | Line of Credit |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | $ 200,000,000 | $ 200,000,000 |  |  |  |  |

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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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