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Debt - Summary of Long-Term Debt (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |
Long term debt | $ 31,580,000,000 | $ 33,876,000,000
Less: unamortized debt discount, premiums and debt issuance costs | (386,000,000) | (513,000,000)
Less: current portion of long-term debt | (2,911,000,000) | (3,002,000,000)
Long-term debt, net | $ 28,283,000,000 | 30,361,000,000
Secured Debt | Minimum |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 4.00% |
Secured Debt | Maximum |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 5.90% |
Secured Debt | Aircraft notes |  |
Debt Instrument [Line Items] |  |
Long term debt | $ 12,262,000,000 | $ 13,293,000,000
Secured Debt | Aircraft notes | Minimum |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 2.70% |
Secured Debt | Aircraft notes | Maximum |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 6.48% |
Secured Debt | Aircraft notes | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 0.49% | 0.49%
Secured Debt | Aircraft notes | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.25% | 2.25%
Secured Debt | MileagePlus Senior Secured Notes |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 6.50% |
Long term debt | $ 3,420,000,000 | $ 3,800,000,000
Secured Debt | MileagePlus Term Loan Facility |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 10.00% |
Long term debt | $ 2,700,000,000 | $ 3,000,000,000
Secured Debt | MileagePlus Term Loan Facility | LIBOR | Maximum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 5.25% | 5.25%
Secured Debt | 2026 and 2029 Notes |  |
Debt Instrument [Line Items] |  |
Long term debt | $ 4,000,000,000 | $ 4,000,000,000
Secured Debt | 2026 and 2029 Notes | Minimum |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 4.38% |
Secured Debt | 2026 and 2029 Notes | Maximum |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 4.63% |
Secured Debt | 2021 Term Loans |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 8.11% |
Long term debt | $ 4,913,000,000 | $ 4,963,000,000
Secured Debt | 2021 Term Loans | LIBOR | Minimum |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.75% | 3.75%
Unsecured |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 4.25% |
Unsecured | Notes |  |
Debt Instrument [Line Items] |  |
Long term debt | $ 596,000,000 | $ 1,041,000,000
Unsecured | Notes | Minimum |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 4.88% |
Unsecured | Notes | Maximum |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 5.00% |
Unsecured | Other unsecured debt |  |
Debt Instrument [Line Items] |  |
Long term debt | $ 508,000,000 | $ 598,000,000
Unsecured | Other unsecured debt | Minimum |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 0.00% |
Unsecured | Other unsecured debt | Maximum |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 5.75% |
Unsecured | PSP Notes |  |
Debt Instrument [Line Items] |  |
Fixed interest rate | 1.00% |
Long term debt | $ 3,181,000,000 |
Aggregate principal amount | $ 1,500,000,000 |
Unsecured | PSP Notes | SOFR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.00% |
Unsecured | Payroll Support Program (PSP1) Note |  |
Debt Instrument [Line Items] |  |
Term of debt | 10 years |
Aggregate principal amount | $ 900,000,000 |
Unsecured | PSP3 Note |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 800,000,000 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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)(1) -URI https://asc.fasb.org/extlink&oid=123466204&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(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 3: 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 https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: 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 https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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