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Commitments (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) aircraft | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |
Impairment of Long-Lived Assets Held-for-use | $ 0 | $ 319 | $ 0
Purchase Obligation, Due in Next Twelve Months | 1,100 |  |
Purchase Obligation, Due in Second Year | 1,500 |  |
Purchase Obligation, Due in Third Year | 1,300 |  |
Purchase Obligation, Due in Fourth Year | 1,700 |  |
Purchase Obligation, Due in Fifth Year | 1,600 |  |
Other Commitment, Due in Fifth Year | $ 600 |  |
Unrecorded Unconditional Purchase Obligation, Aircraft Purchase Deliver Change | 414 |  |
Commitments (Textual) [Abstract] |  |  |
Restricted assets pledged related to workers compensation insurance policies and other business partner agreements | $ 34 |  |
Ratification Bonus |  | $ 50 |
Percentage Of Employees Represented By Unions Under Collective Bargaining Agreements | 47.00% |  |
Employment agreement | 5 years |  |
Employment Agreement Automatic Renewal Term | 5 years |  |
Renewal notice period | 90 days |  |
A220-300 [Member] |  |  |
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |
Number of aircraft and spare engine orders by the firm | aircraft | 70 |  |
A-321 Neo [Member] |  |  |
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |
Number of aircraft and spare engine orders by the firm | aircraft | 79 |  |
Number Of Aircraft Scheduled To Receive Next Year | aircraft | 14 |  |
Number of Aircraft Expected to be Delivered within Twelve Months | aircraft | 11 |  |

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