| Cover Page | May 05, 2020 |
| Entity Information [Line Items] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Document Period End Date | May 5, 2020 |
| Entity File Number | 001-06033 |
| Entity Registrant Name | UNITED AIRLINES HOLDINGS, INC. |
| Entity Central Index Key | 0000100517 |
| Entity Tax Identification Number | 36-2675207 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 233 S. Wacker Drive |
| Entity Address, City or Town | Chicago |
| Entity Address, State or Province | IL |
| Entity Address, Postal Zip Code | 60606 |
| City Area Code | 872 |
| Local Phone Number | 825-4000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.01 par value |
| Trading Symbol | UAL |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Amendment Description | On May 6, 2020, the financial printer utilized by United Airlines, Inc. and United Airlines Holdings, Inc. (together, the “Company”) filed the wrong version of a Form 8-K dated May 5, 2020 of the Company (the “Original Form 8-K”) announcing the Company’s commencement of a private debt offering. This Amendment No. 1 to the Original Form 8-K is being filed solely to correct and replace Items 8.01 and 9.01 of the Original Form 8-K in their entirety. The press release filed as Exhibit 99.1 to the Original Form 8-K is unchanged. |
| UNITED AIRLINES, INC. | |
| Entity Information [Line Items] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Document Period End Date | May 5, 2020 |
| Entity File Number | 001-10323 |
| Entity Registrant Name | UNITED AIRLINES, INC. |
| Entity Central Index Key | 0000319687 |
| Entity Tax Identification Number | 74-2099724 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 233 S. Wacker Drive |
| Entity Address, City or Town | Chicago |
| Entity Address, State or Province | IL |
| Entity Address, Postal Zip Code | 60606 |
| City Area Code | 872 |
| Local Phone Number | 825-4000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Amendment Description | On May 6, 2020, the financial printer utilized by United Airlines, Inc. and United Airlines Holdings, Inc. (together, the “Company”) filed the wrong version of a Form 8-K dated May 5, 2020 of the Company (the “Original Form 8-K”) announcing the Company’s commencement of a private debt offering. This Amendment No. 1 to the Original Form 8-K is being filed solely to correct and replace Items 8.01 and 9.01 of the Original Form 8-K in their entirety. The press release filed as Exhibit 99.1 to the Original Form 8-K is unchanged. |
