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Leases - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) aircraft | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items] |  |  |
Aircraft leases, minimum remaining lease term | 9 months |  |
Aircraft leases, maximum remaining lease term | 5 years |  |
Fleet impairment | $ | $ 273 | $ 0 | $ 0
Facility leases, minimum lease term remaining | 2 months |  |
Facility leases, maximum lease term remaining | 14 years |  |
Minimum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Renewal lease term | 1 year |  |
Maximum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Renewal lease term | 2 years |  |
Aircraft |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Number of aircraft operated | 267 |  |
Number of aircraft accounted for under operating leases | 62 |  |
Finance lease, number of aircraft leases | 4 |  |
Number of aircraft variable rate rent | 0 |  |
Number of aircraft having purchase options | 40 |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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