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Long-term Debt (Tables)
12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
(in millions)
 
December 31, 2017
 
December 31, 2016
5.125% Notes due March 2017
 
$

 
$
301

French Credit Agreements due 2018 - 2.54%
 
1

 
14

Fixed-rate 737 Aircraft Notes payable through 2018 - 7.03%
 
3

 
8

2.75% Notes due 2019
 
300

 
301

Term Loan Agreement payable through 2019 - 6.315%
 
66

 
106

Term Loan Agreement payable through 2019 - 4.84%
 
19

 
28

2.65% Notes due 2020
 
491

 
492

Term Loan Agreement payable through 2020 - 5.223%
 
237

 
284

737 Aircraft Notes payable through 2020
 
155

 
206

Term Loan Agreements payable through 2021 - 7.94%
 

 
20

2.75% Notes due 2022
 
300

 

Pass Through Certificates due 2022 - 6.24%
 
294

 
324

Term Loan Agreement payable through 2026 - 2.67%
 
215

 
215

3.00% Notes due 2026
 
300

 
300

3.45% Notes due 2027
 
300

 

7.375% Debentures due 2027
 
127

 
130

Capital leases
 
885

 
681

 
 
$
3,693

 
$
3,410

Less current maturities
 
348

 
566

Less debt discount and issuance costs
 
25

 
23

 
 
$
3,320

 
$
2,821