XML 49 R31.htm IDEA: XBRL DOCUMENT v3.10.0.1
Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Schedule of assets (liabilities) measured at fair value on a recurring basis Assets (Liabilities) Measured at Fair Value on a Recurring Basis(1) 
 
December 31, 2018
Valuation
Technique
(in millions)
Total
Level 1
Level 2
Cash equivalents
$
1,222

$
1,222

$
—

(a)
Restricted cash equivalents
1,183

1,183

—

(a)
Short-term investments
 
 


U.S. government and agency securities
50

45

5

(a)
Asset- and mortgage-backed securities
36

—

36

(a)
Corporate obligations
90

—

90

(a)
Other fixed income securities
27

—

27

(a)
Long-term investments
1,084

880

204

(a)
Hedge derivatives, net
 
 
 
 
Fuel hedge contracts
15

20

(5
)
(a)(b)
Interest rate contracts
1

—

1

(a)
Foreign currency exchange contracts
(3
)
—

(3
)
(a)
 
December 31, 2017
Valuation
Technique
(in millions)
Total
Level 1
Level 2
Cash equivalents
$
1,357

$
1,357

$
—

(a)
Restricted cash equivalents
38

38

—

(a)
Short-term investments


 



U.S. government securities
93

84

9

(a)
Asset- and mortgage-backed securities
173

—

173

(a)
Corporate obligations
467

—

467

(a)
Other fixed income securities
92

—

92

(a)
Long-term investments
513

485

28

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

(17
)
(a)

(1) 
See Note 10, "Employee Benefit Plans," for fair value of benefit plan assets.