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Debt (Tables) | 3 Months Ended
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Mar. 31, 2018
Details of Pass Through Trusts | Certain details of the pass-through trusts with proceeds received from issuance of debt in 2018 are as follows (in millions, except stated interest rate):
EETC Date |  | Class |  | Principal |  |  | Final expected distribution date |  | Stated interest rate |  |  | Total proceeds received from issuance of debt during 2018 and recorded as debt as of March 31, 2018 |  |  | Remaining proceeds from issuance of debt to be received in future periods |
February 2018 |  | AA |  | $ | 677 |  |  | March 2030 |  |  | 3.50% |  |  | $ | 476 |  |  | $ | 201 |
February 2018 |  | A |  |  | 258 |  |  | March 2030 |  |  | 3.70% |  |  |  | 181 |  |  |  | 77 |
|  |  |  | $ | 935 |  |  |  |  |  |  |  |  | $ | 657 |  |  | $ | 278 |
Contractual Principal Payments | The table below presents the Company’s contractual principal payments (not including debt discount or debt issuance costs) at March 31, 2018 under then-outstanding long-term debt agreements (in millions):
Last nine months of 2018 |  | $ | 1,380 |
2019 |  |  | 1,218 |
2020 |  |  | 1,207 |
2021 |  |  | 1,194 |
2022 |  |  | 1,529 |
After 2022 |  |  | 7,457 |
|  | $ | 13,985 |

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- Definition Schedule of Debt Instruments Pass Through Trusts + References No definition available. + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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