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Debt - Details of Pass Through Trusts (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 01, 2021 | Feb. 28, 2021
Debt Instrument [Line Items] |  |  |  |  |
Proceeds received from issuance of debt | $ 16,044,000,000 | $ 1,847,000,000 | $ 1,594,000,000 |  |
Total debt recorded | 27,301,000,000 | $ 14,733,000,000 |  |  |
Pass-Through Certificates |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds received from issuance of debt | 3,328,000,000 |  |  |  |
Total debt recorded | 4,221,000,000 |  |  |  |
Pass-Through Certificates | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal |  |  |  | $ 4,821,000,000 |
Class AA EETC - Issued September 2019 | Pass-Through Certificates |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal | $ 702,000,000 |  |  |  |
Stated interest rate | 2.70% |  |  |  |
Proceeds received from issuance of debt | $ 189,000,000 |  |  |  |
Total debt recorded | 702,000,000 |  |  |  |
Class A EETC - Issued September 2019 | Pass-Through Certificates |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal | $ 287,000,000 |  |  |  |
Stated interest rate | 2.90% |  |  |  |
Proceeds received from issuance of debt | $ 77,000,000 |  |  |  |
Total debt recorded | 287,000,000 |  |  |  |
Class B EETC - Issued September 2019 | Pass-Through Certificates |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal | $ 232,000,000 |  |  |  |
Stated interest rate | 3.50% |  |  |  |
Proceeds received from issuance of debt | $ 62,000,000 |  |  |  |
Total debt recorded | 232,000,000 |  |  |  |
Class A EETC - Issued October 2020 | Pass-Through Certificates |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal | $ 3,000,000,000 |  |  |  |
Stated interest rate | 5.88% |  |  |  |
Proceeds received from issuance of debt | $ 3,000,000,000 |  |  |  |
Total debt recorded | $ 3,000,000,000 |  |  |  |
Class B EETC - Issued February 2021 | Pass-Through Certificates |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 4.88% |  |  |  |
Total debt recorded | $ 0 |  |  |  |
Class B EETC - Issued February 2021 | Pass-Through Certificates | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal |  |  |  |  | $ 600,000,000

X
- 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 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(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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://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 http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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