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Fair Value Measurements
3 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]  
Fair Value Measurements FAIR VALUE MEASUREMENTS

Assets (Liabilities) Measured at Fair Value on a Recurring Basis
(in millions)
March 31,
2018
Level 1
Level 2
Cash equivalents
$
876

$
876

$

Short-term investments
 
 

U.S. government and agency securities
78

66

12

Asset- and mortgage-backed securities
119


119

Corporate obligations
247


247

Other fixed income securities
79


79

Restricted cash equivalents and investments
34

34


Long-term investments
1,001

972

29

Hedge derivatives, net
 
 
 
Fuel hedge contracts
(3
)
(5
)
2

Foreign currency exchange contracts
(32
)

(32
)
(in millions)
December 31,
2017
Level 1
Level 2
Cash equivalents
$
1,357

$
1,357

$

Short-term investments
 
 


U.S. government and agency securities
93

84

9

Asset- and mortgage-backed securities
173


173

Corporate obligations
467


467

Other fixed income securities
92


92

Restricted cash equivalents and investments
38

38


Long-term investments
513

485

28

Hedge derivatives, net
 
 
 
Fuel hedge contracts
(66
)
(43
)
(23
)
Foreign currency exchange contracts
(17
)

(17
)

Cash Equivalents and Restricted Cash Equivalents and Investments. Cash equivalents generally consist of money market funds. Restricted cash equivalents and investments generally consist of money market funds and time deposits, which primarily relate to certain self-insurance obligations and airport commitments. The fair value of these investments is based on a market approach using prices and other relevant information generated by market transactions involving identical or comparable assets.

Short-Term Investments. The fair values of 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.

Long-Term Investments. Our long-term investments that are measured at fair value primarily consist of equity investments in the parent company of GOL, China Eastern and, as of January 1, 2018, Air France-KLM. Our investments are valued based on market prices and are classified in other noncurrent assets.

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. The hedge contracts include crude oil and refined products, as these commodities are highly correlated with the price of fuel that we consume. Option contracts are valued under an income approach using option pricing models based on data either readily observable in public markets, derived from public markets or provided by counterparties who regularly trade in public markets. Volatilities used in these valuations ranged from 12% to 36% depending on the maturity dates, underlying commodities and strike prices of the option contracts. Swap contracts are valued under an income approach using a discounted cash flow model based on data either readily observable or provided by counterparties who regularly trade in public markets. Discount rates used in these valuations vary based on maturity dates utilizing the London interbank offered rate ("LIBOR"). Futures contracts and options on futures contracts are traded on a public exchange and valued based on quoted market prices.

Foreign Currency Exchange Contracts. Our foreign currency derivatives consist of Japanese yen, Canadian dollar and Euro forward contracts and are valued based on data readily observable in public markets.