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Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Aircraft Maintenance, Materials, and Repairs | $ 619 | $ 625 | $ 622
Maintenance service agreements, Minimum | 10 years |  |
Maintenance service agreements, Maximum | 15 years |  |
Advertising expense | $ 66 | 72 | 66
Deferred income taxes | 1,251 | 1,112 |
Computer Software, Intangible Asset [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Capitalized Computer Software, Net | 102 | 96 |
Amortization expense | 52 | $ 46 | $ 41
Estimated Amortization expense related to computer software, Year one | 35 |  |
Estimated Amortization expense related to computer software, Year two | 26 |  |
Estimated Amortization expense related to computer software, Year three | 22 |  |
Estimated Amortization expense related to computer software, Year four | 15 |  |
Estimated Amortization expense related to computer software, Year five | 4 |  |
High Density Airports, Take-Off and Landing Slots [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets, Net (Excluding Goodwill) | $ 139 |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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