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v3.19.3.a.u2

Summary of Significant Accounting Policies (Details 1) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
Property, Plant and Equipment [Line Items] |  |  |  |
Debt Securities, Held-to-maturity, Sold, Realized Gain (Loss) | $ 0 | $ 0 | $ 0 |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  | $ 58
JFK Terminal 5 [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Leasehold Improvements, Gross |  | 76 |  |
Net Costs For Terminal Construction Project Subject To Underlying Ground Lease |  | $ 637 |  |
Aircraft [Member] |  |  |  |
Property and Equipment |  |  |  |
Estimated Useful Life | 25 years |  |  |
Residual Value | 20.00% |  |  |
In-flight entertainment systems [Member] |  |  |  |
Property and Equipment |  |  |  |
Residual Value | 0.00% |  |  |
Aircraft Parts [Member] |  |  |  |
Property and Equipment |  |  |  |
Residual Value | 10.00% |  |  |
Flight equipment leasehold improvements [Member] |  |  |  |
Property and Equipment |  |  |  |
Residual Value | 0.00% |  |  |
Ground property and equipment [Member] |  |  |  |
Property and Equipment |  |  |  |
Residual Value | 0.00% |  |  |
Leasehold improvements-other [Member] |  |  |  |
Property and Equipment |  |  |  |
Residual Value | 0.00% |  |  |
Buildings on Leased Land Member |  |  |  |
Property and Equipment |  |  |  |
Residual Value | 0.00% |  |  |
JFK Terminal 5 International [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Net Costs For Terminal Construction Project Subject To Underlying Ground Lease | $ 207 |  |  |
Minimum [Member] | In-flight entertainment systems [Member] |  |  |  |
Property and Equipment |  |  |  |
Estimated Useful Life | 5 years |  |  |
Minimum [Member] | Ground property and equipment [Member] |  |  |  |
Property and Equipment |  |  |  |
Estimated Useful Life | 2 years |  |  |
Maximum [Member] | In-flight entertainment systems [Member] |  |  |  |
Property and Equipment |  |  |  |
Estimated Useful Life | 10 years |  |  |
Maximum [Member] | Ground property and equipment [Member] |  |  |  |
Property and Equipment |  |  |  |
Estimated Useful Life | 10 years |  |  |

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