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Financial Derivative Instruments - Offsetting of Derivative Assets (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Offsetting Assets [Line Items] |  |
Gross amounts of recognized assets | $ 682 | $ 134
Fuel derivative contracts | Prepaid expenses and other current assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts of recognized assets | 338 | 13
Gross amounts offset in the Balance Sheet | 69 | 3
Net amounts of assets presented in the Balance Sheet | 269 | 10
Fuel derivative contracts | Other assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts of recognized assets | 343 | 121
Gross amounts offset in the Balance Sheet | 93 | 31
Net amounts of assets presented in the Balance Sheet | 250 | 90
Interest rate derivatives | Other assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts of recognized assets | 1 | 0
Gross amounts offset in the Balance Sheet | 0 | 0
Net amounts of assets presented in the Balance Sheet | $ 1 | $ 0

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