CARES Act, Payroll Support Program 2, Total Payment

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CARES Act, Payroll Support Program, Grant

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CARES Act, Payroll Support Program, Total Payment

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CARES Act, Secured Loans, Eligibility Amount

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Debt Instrument, Net Amount

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Finance Lease, Number of Aircraft Leases

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Number of new aircraft held as security.

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Number of Aircraft, Secured Debt Transactions

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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.

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No definition available.

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Proceeds from Sale Leaseback Transactions

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Sale Leaseback Cash Proceeds Financing

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Sale Leaseback Cash Proceeds, Investing

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Amount of amortization expense attributable to debt issuance costs.

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of warrants or rights outstanding.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, after accumulated amortization, of debt premium.

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Gross amount of debt extinguished.

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Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount, after accumulated amortization, of right-of-use asset from finance lease.

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Amount of accumulated amortization of right-of-use asset from finance lease.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Amount of gain (loss) on sale and leaseback transaction from transfer of asset accounted for as sale.

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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	12 Months Ended
	Sep. 15, 2021 USD ($)	Jun. 17, 2021 USD ($)	May 06, 2021 USD ($) $ / shares shares	Jan. 15, 2021 USD ($) $ / shares shares	Jun. 17, 2020 USD ($)	Apr. 23, 2020 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) day $ / shares	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) aircraft	Dec. 31, 2019 USD ($) airbus	Nov. 03, 2020 USD ($)	Sep. 29, 2020 USD ($) $ / shares shares	Aug. 31, 2020 USD ($)	Apr. 22, 2020 USD ($)	Nov. 30, 2019 USD ($) aircraft	Aug. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) airbus	Mar. 30, 2014 USD ($) aircraft	Apr. 30, 2013 USD ($)
Debt Instrument [Line Items]
Repayments of debt	$ 118,000,000
CARES act, payroll support program, total payment						$ 963,000,000
CARES act, payroll support program, grant						$ 704,000,000
Debt instrument term						10 years
Class of warrant or right, outstanding (in shares) \| shares						2.7						1.2
Class of warrant or right, exercise price of warrants or rights (in dollars per share) \| $ / shares						$ 9.50						$ 9.50
Warrants and rights outstanding, term												5 years
CARES act, secured loans, eligibility amount											$ 1,900,000,000
Line of credit, current								$ 0
Proceeds from sale leaseback transactions									$ 563,000,000
Proceeds from sale-leaseback transactions								0	354,000,000	$ 0
Proceeds from sale-leaseback transactions								0	209,000,000	0
Losses on sale-leaseback transactions								0	106,000,000	0
Finance lease assets								3,000,000	131,000,000
Finance lease, right-of-use asset, accumulated amortization								1,000,000	54,000,000
2022								1,000,000
2023								2,000,000
Interest expense								6,000,000
Debt issuance costs amortization								3,000,000
Debt extinguishment expense								50,000,000	9,000,000
Pledged assets not separately reported flight equipment								5,700,000,000
Interest paid, including capitalized interest, operating and investing activities								180,000,000	$ 139,000,000	62,000,000
Morgan Stanley
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity								200,000,000
Payroll Support 2 Payments
Debt Instrument [Line Items]
CARES act, payroll support program, grant				$ 436,000,000
Debt instrument term				10 years
Class of warrant or right, outstanding (in shares) \| shares			0.7	1.0
Class of warrant or right, exercise price of warrants or rights (in dollars per share) \| $ / shares			$ 19.90	$ 14.43
CARES Act, Payroll Support Program 2, Total Payment				$ 580,000,000
Payroll Support 3 Payments
Debt Instrument [Line Items]
CARES act, payroll support program, total payment			$ 541,000,000
CARES act, payroll support program, grant			$ 409,000,000
Debt instrument term			10 years
A-320
Debt Instrument [Line Items]
Finance lease, number of aircraft leases \| aircraft									2
A-320 and A-321
Debt Instrument [Line Items]
Finance lease assets								4,000,000	$ 188,000,000
2022								1,000,000
2023								2,000,000
A-321-200
Debt Instrument [Line Items]
Finance lease, number of aircraft leases \| aircraft									2
Line of Credit \| Revolving Credit Facility and Letter of Credit Facility \| Citibank \| Maximum
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity																$ 550,000,000
Line of Credit \| Revolving Credit Facility and Letter of Credit Facility \| Morgan Stanley
Debt Instrument [Line Items]
Long-term line of credit								0	$ 0
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
Fixed rate enhanced equipment notes, 2020-1A and B \| Long-term Debt
Debt Instrument [Line Items]
Debt instrument, face amount													$ 808,000,000		$ 772,000,000
2019-1 Series B, due through 2027 \| Long-term Debt
Debt Instrument [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
Debt Instrument [Line Items]
Number of aircraft, secured debt transactions													24		25
2020-1 Series A, due through 2032 \| Long-term Debt
Debt Instrument [Line Items]
Debt instrument, face amount													$ 636,000,000		$ 589,000,000
Debt instrument, interest rate, stated percentage													4.00%		2.75%
2020-1 Series B, due through 2028 \| Long-term Debt
Debt Instrument [Line Items]
Debt instrument, face amount													$ 172,000,000		$ 183,000,000
Debt instrument, interest rate, stated percentage													7.75%		2.95%
Fixed rate enhanced equipment notes, due through 2023
Debt Instrument [Line Items]
Debt instrument, face amount																		$ 226,000,000
Fixed rate enhanced equipment notes, due through 2023 \| Secured Debt \| A-320-200
Debt Instrument [Line Items]
Number of new aircraft held as security \| aircraft																		14
Fixed rate equipment notes, due through 2028
Debt Instrument [Line Items]
Debt instrument, face amount										$ 219,000,000							$ 567,000,000
Fixed rate equipment notes, due through 2028 \| Secured Debt \| A-320
Debt Instrument [Line Items]
Number of new aircraft held as security \| airbus										10							14
Fixed rate equipment notes, due through 2028 \| Secured Debt \| A-321
Debt Instrument [Line Items]
Number of new aircraft held as security \| airbus										2							10
Floating rate equipment notes, due through 2028
Debt Instrument [Line Items]
Debt instrument, face amount																	$ 120,000,000
Floating rate equipment notes, due through 2028 \| Secured Debt \| A-320
Debt Instrument [Line Items]
Number of new aircraft held as security \| airbus																	6
Floating rate equipment notes, due through 2028 \| Secured Debt \| A-321
Debt Instrument [Line Items]
Number of new aircraft held as security \| airbus																	1
Floating rate term loan credit facility, due through 2024 \| Long-term Debt
Debt Instrument [Line Items]
Repayments of debt		$ 722,000,000
Long-term line of credit								$ 0
Floating rate term loan credit facility, due through 2024 \| Long-term Debt \| Barclays
Debt Instrument [Line Items]
Debt instrument, face amount					$ 750,000,000
Floating rate term loan credit facility, due through 2024 \| Long-term Debt \| Barclays \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate					1.00%
Unsecured Debt \| US Department of Treasury
Debt Instrument [Line Items]
Debt instrument, face amount						$ 259,000,000
Debt instrument, interest rate, stated percentage						1.00%
Unsecured Debt \| US Department of Treasury \| Payroll Support 2 Payments
Debt Instrument [Line Items]
Debt instrument, face amount				$ 144,000,000
Debt instrument, interest rate, stated percentage				1.00%
Unsecured Debt \| US Department of Treasury \| Payroll Support 3 Payments
Debt Instrument [Line Items]
Debt instrument, face amount			$ 132,000,000
Debt instrument, interest rate, stated percentage			1.00%
Unsecured Debt \| US Department of Treasury \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate						2.00%
Unsecured Debt \| US Department of Treasury \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Payroll Support 2 Payments
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				2.00%
Unsecured Debt \| US Department of Treasury \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Payroll Support 3 Payments
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			2.00%
Secured CARES Act loan, due through 2025 \| Long-term Debt \| US Department of Treasury
Debt Instrument [Line Items]
Debt instrument, face amount												$ 115,000,000
Citibank line of credit, due through 2023 \| Line of Credit \| Citibank
Debt Instrument [Line Items]
Line of credit, current														$ 550,000,000
Convertible Senior Notes Due 2026 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount							$ 750,000,000
Debt instrument, interest rate, stated percentage							0.50%	0.50%
Proceeds from offering							$ 734,000,000
Debt instrument, convertible ratio (in dollars per share) \| $ / shares							$ 25.92
Debt instrument, conversion ratio							0.0385802
Convertible Senior Notes Due 2026 \| Senior Notes \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage							100.00%
Trading days \| day							20
Convertible Senior Notes Due 2026 \| Senior Notes \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage							130.00%
Trading days \| day							30