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Long-term Debt (Tables) | 12 Months Ended
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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 |

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