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AOCI - Reclassification out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other operating expenses | $ (463) | $ (698)
Fuel and oil | 469 | 870
Other (gains) losses, net | 48 | (28)
Less: Tax Expense | (30) | $ 50
Reclassification out of Accumulated Other Comprehensive Income (Loss) |  |
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net of Tax | (29) |
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Fuel derivatives |  |
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Less: Tax Expense | 5 |
Net of Tax | 17 |
Fuel derivatives | Reclassification out of Accumulated Other Comprehensive Income (Loss) |  |
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Fuel and oil | 16 |
Other (gains) losses, net | 6 |
Interest rate derivatives | Reclassification out of Accumulated Other Comprehensive Income (Loss) |  |
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other operating expenses | 1 |
Less: Tax Expense | 0 |
Net of Tax | 1 |
Unrealized gain on deferred compensation plan investment | Reclassification out of Accumulated Other Comprehensive Income (Loss) |  |
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Less: Tax Expense | (13) |
Net of Tax | (47) |
Other (gains) losses, net | $ (60) |

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