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Fair value measurements, investments and notes receivable (Tables) | 3 Months Ended
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Mar. 31, 2024
Fair Value Disclosures [Abstract] |
Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | The table below presents disclosures about the financial assets and liabilities measured at fair value on a recurring basis in UAL's financial statements (in millions):
| March 31, 2024 |  | December 31, 2023
| Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3
Cash and cash equivalents | $ | 8,401 |  |  | $ | 8,401 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,058 |  |  | $ | 6,058 |  |  | $ | — |  |  | $ | — |
Restricted cash — current | 40 |  |  | 40 |  |  | — |  |  | — |  |  | 31 |  |  | 31 |  |  | — |  |  | — |
Restricted cash — non-current | 244 |  |  | 244 |  |  | — |  |  | — |  |  | 245 |  |  | 245 |  |  | — |  |  | — |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and agency notes | 5,518 |  |  | — |  |  | 5,518 |  |  | — |  |  | 8,257 |  |  | — |  |  | 8,257 |  |  | — |
Certificates of deposit placed through an account registry service ("CDARS") | 73 |  |  | — |  |  | 73 |  |  | — |  |  | 73 |  |  | — |  |  | 73 |  |  | — |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities | 116 |  |  | 116 |  |  | — |  |  | — |  |  | 177 |  |  | 177 |  |  | — |  |  | — |
Schedule of Carrying Values and Estimated Fair Values of Financial Instruments | The table below presents the carrying values and estimated fair values of financial instruments not presented in the tables above (in millions). Carrying amounts include any related discounts, premiums and issuance costs:
| March 31, 2024 |  | December 31, 2023
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
|  |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  |  |  | Total |  | Level 1 |  | Level 2 |  | Level 3
Long-term debt | $ | 27,017 |  |  | $ | 26,480 |  |  | $ | — |  |  | $ | 20,319 |  |  | $ | 6,161 |  |  | $ | 29,075 |  |  | $ | 28,302 |  |  | $ | — |  |  | $ | 22,543 |  |  | $ | 5,759 |
Schedule of Fair Value Measurement Inputs and Valuation Techniques | Fair value of the financial instruments included in the tables above was determined as follows:
Description | Fair Value Methodology
Cash and cash equivalents and Restricted cash (current and non-current) | The carrying amounts of these assets approximate fair value.
Short-term and Long-term investments | Fair value is based on (a) the trading prices of the investment or similar instruments or (b) broker quotes obtained by third-party valuation services.
Long-term debt | Fair values were based on either market prices or the discounted amount of future cash flows using our current incremental rate of borrowing for similar liabilities or assets.

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-11 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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