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Financial Derivative Instruments - Offsetting of Derivative Assets (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Offsetting Assets [Line Items] |  |
Gross amounts of recognized assets | $ 503 | $ 134
Fuel derivatives | Prepaid expenses and other current assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts of recognized assets | 224 | 13
Gross amounts offset in the Balance Sheet | 48 | 3
Net amounts of assets presented in the Balance Sheet | 176 | 10
Fuel derivatives | Other assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts of recognized assets | 278 | 121
Gross amounts offset in the Balance Sheet | 72 | 31
Net amounts of assets presented in the Balance Sheet | 206 | 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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