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Long-term Debt, Short-term Borrowings and Finance Lease Obligations (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 08, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | Apr. 23, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |
Reduction in outstanding debt and capital lease obligations |  |  | $ 1,300,000,000 |  |
Value of aircraft, engines and other equipment and facilities which were pledged as security under various loan agreements |  | $ 6,200,000,000 | 6,200,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year |  | 95,000,000 | 95,000,000 |  |
Long-term debt, maturities, repayments of principal in Year Two |  | 438,000,000 | 438,000,000 |  |
Long-term debt, maturities, repayments of principal in Year Three |  | 417,000,000 | 417,000,000 |  |
Long-term debt, maturities, repayments of principal in Year Four |  | 1,100,000,000 | 1,100,000,000 |  |
Long-term debt, maturities, repayments of principal in Year Five |  | 966,000,000 | 966,000,000 |  |
Long-term debt, maturities, repayments of principal after Year Five |  | 1,900,000,000 | 1,900,000,000 |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Long-term Debt |  | 4,774,000,000 | 4,774,000,000 |  | $ 2,245,000,000
Estimated Fair Value, Total |  | 4,578,000,000 | 4,578,000,000 |  | 2,367,000,000
Long-term Debt [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Debt Instrument, Face Amount |  | 923,000,000 | 923,000,000 |  |
Public Debt Fixed Rate Special Facility Bonds Due Through Two Thousand Thirty Six [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Long-term Debt |  | 42,000,000 | 42,000,000 |  | 42,000,000
Estimated Fair Value, Total |  | 43,000,000 | 43,000,000 |  | 46,000,000
Fixed rate enhanced equipment notes, due through 2032, 2019-1 AA [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Long-term Debt |  | 574,000,000 | 574,000,000 |  | 581,000,000
Estimated Fair Value, Total |  | 414,000,000 | 414,000,000 |  | 586,000,000
Fixed rate enhanced equipment notes, due through 2028, 2019-1 A [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Long-term Debt |  | 179,000,000 | 179,000,000 |  | 181,000,000
Estimated Fair Value, Total |  | 146,000,000 | 146,000,000 |  | 186,000,000
Fixed rate enhanced equipment notes, due through 2027, 2019-1 B [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Long-term Debt |  | 114,000,000 | 114,000,000 |  | 0
Estimated Fair Value, Total |  | 142,000,000 | 142,000,000 |  | 0
Fixed rate enhanced equipment notes, due through 2027, 2019-1 B [Member] | Long-term Debt [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Debt Instrument, Face Amount |  | $ 115,000,000 | $ 115,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.00% | 8.00% |  |
Fixed rate enhanced equipment notes, due through 2032, 2020-1 A [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Long-term Debt |  | $ 628,000,000 | $ 628,000,000 |  | 0
Estimated Fair Value, Total |  | 611,000,000 | 611,000,000 |  | 0
Fixed rate enhanced equipment notes, due through 2032, 2020-1 A [Member] | Long-term Debt [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Debt Instrument, Face Amount |  | $ 636,000,000 | $ 636,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.00% | 4.00% |  |
Fixed rate enhanced equipment notes, due through 2028, 2020-1 B [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Long-term Debt |  | $ 170,000,000 | $ 170,000,000 |  | 0
Estimated Fair Value, Total |  | 213,000,000 | 213,000,000 |  | 0
Fixed rate enhanced equipment notes, due through 2028, 2020-1 B [Member] | Long-term Debt [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Debt Instrument, Face Amount |  | $ 172,000,000 | $ 172,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 7.75% | 7.75% |  |
Fixed rate enhanced equipment notes, 2020-1A and B [Member] | Long-term Debt [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Debt Instrument, Face Amount |  | $ 808,000,000 | $ 808,000,000 |  |
Non Public Debt Fixed Rate Enhanced Equipment Notes Due Through Two Thousand And Twenty Three [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Long-term Debt |  | 114,000,000 | 114,000,000 |  | 133,000,000
Estimated Fair Value, Total |  | 115,000,000 | 115,000,000 |  | 141,000,000
Non Public Debt Floating Rate Equipment Notes Due Through Two Thousand And Twenty Eight [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Long-term Debt |  | 164,000,000 | 164,000,000 |  | 201,000,000
Estimated Fair Value, Total |  | 150,000,000 | 150,000,000 |  | 207,000,000
Non Public Debt Fixed Rate Equipment Notes Due Through Two Thousand Twenty Eight [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Long-term Debt |  | 935,000,000 | 935,000,000 |  | 1,107,000,000
Estimated Fair Value, Total |  | 920,000,000 | 920,000,000 |  | 1,201,000,000
Non Public Debt Floating Rate Term Loan Credit Facility Due Through 2024 [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Long-term Debt |  | 709,000,000 | 709,000,000 |  | 0
Estimated Fair Value, Total |  | 750,000,000 | 750,000,000 |  | 0
Non Public Debt Unsecured CARES Act Payroll Support Program loan due through 2025 [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Long-term Debt |  | 259,000,000 | 259,000,000 |  | 0
Estimated Fair Value, Total |  | 192,000,000 | 192,000,000 |  | 0
Non Public Debt Secured CARES Act Loan due through 2025 [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Long-term Debt |  | 105,000,000 | 105,000,000 |  | 0
Estimated Fair Value, Total |  | 100,000,000 | 100,000,000 |  | 0
Non Public Debt Sale Leaseback Transactions due through 2024 [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Long-term Debt |  | 235,000,000 | 235,000,000 |  | 0
Estimated Fair Value, Total |  | 262,000,000 | 262,000,000 |  | 0
Non Public Debt Citibank Line of Credit due through 2023 [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Long-term Debt |  | 546,000,000 | 546,000,000 |  | 0
Estimated Fair Value, Total |  | $ 520,000,000 | $ 520,000,000 |  | 0
Airbus A321 [Member] | Long-term Debt [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Secured Debt |  | 49 | 49 |  |
Airbus A321 [Member] | Fixed rate enhanced equipment notes, due through 2027, 2019-1 B [Member] | Long-term Debt [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Secured Debt |  | 25 | 25 |  |
Airbus A321 [Member] | Fixed rate enhanced equipment notes, 2020-1A and B [Member] | Long-term Debt [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Secured Debt |  | 24 | 24 |  |
Barclays [Member] | Non Public Debt Floating Rate Term Loan Credit Facility Due Through 2024 [Member] | Long-term Debt [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Debt Instrument, Face Amount |  | $ 750,000,000 | $ 750,000,000 |  |
US Department of Treasury [Member] | Non Public Debt Secured CARES Act Loan due through 2025 [Member] | Long-term Debt [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Debt Instrument, Face Amount |  | 115,000,000 | 115,000,000 |  |
US Department of Treasury [Member] | Unsecured Debt [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Debt Instrument, Face Amount |  | 8,000,000 | 8,000,000 | $ 251,000,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 1.00% |
Long-term Debt, Term |  |  |  | 10 years |
Citibank [Member] | Non Public Debt Citibank Line of Credit due through 2023 [Member] | Line of Credit [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Line of Credit, Current |  | 550,000,000 | 550,000,000 |  |
Morgan Stanley [Member] |  |  |  |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Line of Credit, Current |  | $ 0 | $ 0 |  | $ 0
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | US Department of Treasury [Member] | Unsecured Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.00% |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Non Public Debt Secured CARES Act Loan due through 2025 [Member] | Long-term Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  | LIBOR (or another rate based on certain market interest rates, plus a margin of 1% per annum, in each case with a floor of 0%), plus a margin of 2.75% per annum |  |
London Interbank Offered Rate (LIBOR) [Member] | Barclays [Member] | Non Public Debt Floating Rate Term Loan Credit Facility Due Through 2024 [Member] | Long-term Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  | LIBOR (subject to a 1.00% floor), or at our election another rate, in each case, plus a specified margin |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.25% | 6.25% |  |
London Interbank Offered Rate (LIBOR) [Member] | Citibank [Member] | Non Public Debt Citibank Line of Credit due through 2023 [Member] | Line of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  | LIBOR, plus a margin |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Line of Credit Facility, Interest Rate During Period |  | 2.22% | 2.22% |  |
Short-term Debt [Member] | Morgan Stanley [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of Debt |  | $ 998,000,000 |  |  |
Short-term Debt, Fair Value |  |  | $ 0 |  |
Carrying amounts and estimated fair values of long-term debt |  |  |  |  |
Debt Instrument, Face Amount |  | 1,000,000,000.0 | $ 1,000,000,000.0 |  |
Short-term Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Morgan Stanley [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  | LIBOR (but not less than 1% per annum), plus a margin |  |
Line of Credit [Member] | Morgan Stanley [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 200,000,000 | $ 200,000,000 |  |
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | Morgan Stanley [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  | LIBOR, plus a margin |  |

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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 Scheduled maturities, Remainder of Fiscal Year, short-term borrowings, long-term debt, and finance lease obligations + References No definition available. + Details
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- Definition Scheduled maturities, Year 2, short-term borrowings, long-term debt, and finance lease obligations + References No definition available. + Details
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- Definition Scheduled maturities, Year 3, short-term borrowings, long-term debt, and finance lease obligations + References No definition available. + Details
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- Definition Scheduled maturities, Year 4, short-term borrowings, long-term debt, and finance lease obligations + References No definition available. + Details
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- Definition Scheduled maturities, Year 5, short-term borrowings, long-term debt, and finance lease obligations + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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