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Long-term Debt (Tables)
12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
(in millions)
 
December 31, 2018
 
December 31, 2017
French Credit Agreements due June 2018 - 2.54%
 
$

 
$
1

Fixed-rate 737 Aircraft Notes payable through January 2018 - 7.03%
 

 
3

2.75% Notes due November 2019
 
300

 
300

Term Loan Agreement payable through May 2019 - 6.315%
 
23

 
66

Term Loan Agreement payable through July 2019 - 4.84%
 
10

 
19

2.65% Notes due 2020
 
492

 
491

Term Loan Agreement payable through 2020 - 5.223%
 
187

 
237

737 Aircraft Notes payable through 2020
 
67

 
155

2.75% Notes due 2022
 
300

 
300

Pass Through Certificates due 2022 - 6.24%
 
250

 
294

Term Loan Agreement payable through 2026 - 3.88%
 
197

 
215

3.00% Notes due 2026
 
300

 
300

3.45% Notes due 2027
 
300

 
300

7.375% Debentures due 2027
 
125

 
127

Capital leases
 
845

 
885

 
 
$
3,396

 
$
3,693

Less current maturities
 
606

 
348

Less debt discount and issuance costs
 
19

 
25

 
 
$
2,771

 
$
3,320