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Fair Value Measurements
9 Months Ended
Sep. 30, 2019
Fair Value Disclosures [Abstract]  
Fair Value Measurements FAIR VALUE MEASUREMENTS

Assets (Liabilities) Measured at Fair Value on a Recurring Basis
(in millions)
September 30,
2019
Level 1
Level 2
Cash equivalents
$
1,489

$
1,489

$

Restricted cash equivalents
798

798


Long-term investments
1,214

1,009

205

Hedge derivatives, net
 
 
 
Fuel hedge contracts
22

15

7

Interest rate contracts
82


82

Foreign currency exchange contracts
21


21

(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 our new terminal facilities at New York's 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 forward contracts and are valued based on data readily observable in public markets.