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Supplemental Financial Information - Accounts Payable (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Accounts payable trade | $ 234 | $ 111
Salaries payable | 247 | 201
Taxes payable excluding income taxes | 163 | 49
Aircraft maintenance payable | 72 | 95
Fuel payable | 114 | 66
Other payable | 399 | 409
Accounts payable | $ 1,229 | $ 931

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