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FAIR VALUE MEASUREMENTS | 6 Months Ended
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Jun. 30, 2023
Fair Value Disclosures [Abstract] |
FAIR VALUE MEASUREMENTS | FAIR VALUE MEASUREMENTSAssets/(Liabilities) Measured at Fair Value on a Recurring Basis
(in millions) | June 30, 2023 | Level 1 | Level 2 | Level 3
Cash equivalents | $ | 1,339 |  | $ | 1,339 |  | $ | — |  | $ | — |
Restricted cash equivalents | 156 |  | 156 |  | — |  | — |
Short-term investments |  |  |  |
U.S. Government securities | 1,498 |  | 205 |  | 1,293 |  | — |
Corporate obligations | 1,643 |  | — |  | 1,643 |  | — |
Asset-backed securities | 120 |  | — |  | 120 |  | — |
Other fixed income securities | 107 |  | — |  | 107 |  | — |
Long-term investments | 1,701 |  | 1,536 |  | 39 |  | 126 |
Fuel hedge contracts | (9) |  | — |  | (9) |  | — |
(in millions) | December 31, 2022 | Level 1 | Level 2 | Level 3
Cash equivalents | $ | 2,021 |  | $ | 2,021 |  | $ | — |  | $ | — |
Restricted cash equivalents | 206 |  | 206 |  | — |  | — |
Short-term investments |  |  |  |
U.S. Government securities | 1,587 |  | 122 |  | 1,465 |  | — |
Corporate obligations | 1,614 |  | — |  | 1,614 |  | — |
Other fixed income securities | 67 |  | — |  | 67 |  | — |
Long-term investments | 1,450 |  | 1,305 |  | 38 |  | 107 |
Fuel hedge contracts | (47) |  | — |  | (47) |  | — |
Cash Equivalents and Restricted Cash Equivalents. Cash equivalents generally consist of money market funds. Restricted cash equivalents generally consist of money market funds, time deposits, commercial paper and negotiable certificates of deposit, which primarily relate to certain self-insurance obligations and airport commitments. Restricted cash equivalents are recorded in prepaid expenses and other on our balance sheet. The fair value of these cash equivalents is based on a market approach using prices generated by market transactions involving identical or comparable assets. Short-Term Investments. The fair values of our short-term investments are based on a market approach using industry standard valuation techniques that incorporate observable inputs such as quoted market prices, interest rates, benchmark curves, credit ratings of the security and other observable information. As of June 30, 2023, the estimated fair value of our short-term investments was $3.4 billion. Of these investments, $3.1 billion are expected to mature in one year or less, with the remainder maturing by the first quarter of 2025. Investments with maturities beyond one year when purchased are classified as short-term investments if they are expected to be available to support our short-term liquidity needs. Long-Term Investments. Our long-term investments measured at fair value primarily consist of equity investments, which are valued based on market prices or other observable transactions and inputs, and are recorded in equity investments on our balance sheet. Our equity investments in private companies are classified as Level 3 in the fair value hierarchy as their equity is not traded on a public exchange and our valuations incorporate certain unobservable inputs, including non-public equity issuances. Fair value measurement using unobservable inputs is inherently uncertain, and a change in significant inputs could result in different fair values. See Note 4, "Investments," for further information on our equity investments. Fuel Hedge Contracts. Our derivative contracts to hedge the financial risk from changing fuel prices are primarily related to inventory at our wholly-owned subsidiary, Monroe Energy, LLC ("Monroe"). Our fuel hedge portfolio may consist of a combination of options, swaps or futures contracts, most of which have a duration of less than three months. Option and swap contracts are valued under income approaches using option pricing models and discounted cash flow models, respectively, based on data either readily observable in public markets, derived from public markets or provided by counterparties who regularly trade in public markets. Futures contracts and options on futures contracts are traded on a public exchange and valued based on quoted market prices. We recognized gains of $12 million and $43 million on our fuel hedge contracts in aircraft fuel and related taxes on our Condensed Consolidated Statements of Operations and Comprehensive Income/(Loss) ("income statement") for the three and six months ended June 30, 2023, respectively, compared to losses of $239 million and $478 million for the three and six months ended June 30, 2022, respectively. The gains recognized during the first six months of 2023 were composed of $39 million of mark-to-market gains and $4 million of settlement gains on contracts. Gains and losses on settled contracts are reflected within Monroe's operating results. See Note 9, "Segments," for further information on our Monroe refinery segment.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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