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AOCI - Reclassification out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Fuel and oil | $ 379 | $ 1,090 | $ 1,507 | $ 3,242
Other (gains) losses, net | (35) | (3) | (95) | (8)
Less: Tax Expense | 385 | $ (160) | 759 | $ (504)
Interest rate derivatives |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification to earnings | 0 |  | (1) |
Reclassification out of Accumulated Other Comprehensive Income (Loss) |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net of Tax | 31 |  | 72 |
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Fuel derivatives |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification to earnings | (40) |  | (92) |
Less: Tax Expense | (9) |  | (21) |
Net of Tax |  |  | 71 |
Fuel derivatives | Reclassification out of Accumulated Other Comprehensive Income (Loss) |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Fuel and oil | 18 |  | 54 |
Other (gains) losses, net | $ 22 |  | 38 |
Interest rate derivatives | Reclassification out of Accumulated Other Comprehensive Income (Loss) |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Less: Tax Expense |  |  | 0 |
Net of Tax |  |  | $ 1 |

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