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Supplemental Financial Information - Accounts Payable (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts payable trade	$ 219	$ 111
Salaries payable	253	201
Taxes payable excluding income taxes	266	49
Aircraft maintenance payable	75	95
Fuel payable	112	66
Other payable	453	409
Accounts payable	$ 1,378	$ 931

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Carrying value as of the balance sheet date of obligations incurred and payable for aircraft maintenance. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred and payable for fuel. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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