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Supplemental Financial Information - Accounts Payable (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts Payable [Abstract] |  |
Accounts payable trade | $ 304 | $ 263
Salaries payable | 231 | 216
Taxes payable excluding income taxes | 227 | 220
Aircraft maintenance payable | 162 | 69
Fuel payable | 129 | 122
Other payable | 521 | 526
Accounts payable | $ 1,574 | $ 1,416

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