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Fair Value Measurements | 3 Months Ended
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Mar. 31, 2019
Fair Value Disclosures [Abstract] |
Fair Value Measurements | FAIR VALUE MEASUREMENTS Assets (Liabilities) Measured at Fair Value on a Recurring Basis
(in millions) | March 31, 2019 | Level 1 | Level 2
Cash equivalents | $ | 1,508 |  | $ | 1,508 |  | $ | — |
Restricted cash equivalents | 1,075 |  | 1,075 |  | — |
Long-term investments | 1,174 |  | 970 |  | 204 |
Hedge derivatives, net |  |  |
Fuel hedge contracts | 7 |  | 1 |  | 6 |
Interest rate contracts | 24 |  | — |  | 24 |
Foreign currency exchange contracts | 8 |  | — |  | 8 |
(in millions) | December 31, 2018 | Level 1 | Level 2
Cash equivalents | $ | 1,222 |  | $ | 1,222 |  | $ | — |
Restricted cash equivalents | 1,183 |  | 1,183 |  | — |
Short-term investments |  |  |  |
U.S. government and agency securities | 50 |  | 45 |  | 5 |
Asset- and mortgage-backed securities | 36 |  | — |  | 36 |
Corporate obligations | 90 |  | — |  | 90 |
Other fixed income securities | 27 |  | — |  | 27 |
Long-term investments | 1,084 |  | 880 |  | 204 |
Hedge derivatives, net |  |  |
Fuel hedge contracts | 15 |  | 20 |  | (5 | )
Interest rate contracts | 1 |  | — |  | 1 |
Foreign currency exchange contracts | (3 | ) | — |  | (3 | )
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 proceeds from debt issued to finance a portion of the construction costs for the new terminal facilities at the LaGuardia Airport. 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 were based on a market approach using industry standard valuation techniques that incorporated observable inputs such as quoted market prices, interest rates, benchmark curves, credit ratings of the security or other observable information and were recorded in prepaid expenses and other on the Consolidated Balance Sheet ("balance sheet"). Long-Term Investments. Our long-term investments that are measured at fair value primarily consist of equity investments, which are valued based on market prices or other observable transactions and are recorded in other noncurrent assets on our balance sheet. See Note 4, "Investments," for further information on our equity investments. Hedge Derivatives. A portion of our derivative contracts are negotiated over-the-counter with counterparties without going through a public exchange. Accordingly, our fair value assessments give consideration to the risk of counterparty default (as well as our own credit risk). Such contracts are classified as Level 2 within the fair value hierarchy. The remainder of our hedge contracts are comprised of futures contracts, which are traded on a public exchange. These contracts are classified within Level 1 of the fair value hierarchy.
• | Fuel Contracts. Our fuel hedge portfolio consists of options, swaps and futures. 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.
• | Interest Rate Contracts. Our interest rate derivatives are swap contracts, which are valued based on data readily observable in public markets.
• Foreign Currency Exchange Contracts. Our foreign currency derivatives consist of Japanese yen and Euro forward contracts and are valued based on data readily observable in public markets.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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