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Long-term Debt (Tables)
12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
(in millions)
 
December 31, 2019
 
December 31, 2018
2.75% Notes due November 2019

 
$

 
$
300

Term Loan Agreement payable through May 2019 - 6.315%
 

 
23

Term Loan Agreement payable through July 2019 - 4.84%
 

 
10

2.65% Notes due 2020
 
500

 
492

Term Loan Agreement payable through 2020 - 5.223%
 
134

 
187

737 Aircraft Notes payable through 2020
 
20

 
67

2.75% Notes due 2022
 
300

 
300

Pass Through Certificates due 2022 - 6.24%
 
197

 
250

Term Loan Agreement payable through 2026 - 3.03%
 
178

 
197

3.00% Notes due 2026
 
300

 
300

3.45% Notes due 2027
 
300

 
300

7.375% Debentures due 2027
 
122

 
125

Finance leases
 
627

 
845

 
 
$
2,678

 
$
3,396

Less current maturities
 
819

 
606

Less debt discount and issuance costs
 
13

 
19

 
 
$
1,846

 
$
2,771