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

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 + Details
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