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Accumulated Other Comprehensive (Income) Loss - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest Expense | $ 118 | $ 131 | $ 114
Fuel and oil | 4,347 | 4,616 | 4,076
Less: Tax Expense | 657 | $ 699 | $ (92)
Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net of tax | 41 |  |
Fuel derivatives | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Fuel and oil | 48 |  |
Less: Tax Expense | 11 |  |
Net of tax | 37 |  |
Interest rate derivatives | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest Expense | 5 |  |
Less: Tax Expense | 1 |  |
Net of tax | $ 4 |  |

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