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AOCI - Reclassification out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Fuel and oil	$ 257	$ 1,136	$ 1,128	$ 2,152
Other (gains) losses, net	(32)	(2)	(60)	(4)
Less: Tax Expense	324	$ (227)	374	$ (344)
Interest rate derivatives
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification to earnings	(1)		(1)
Reclassification out of Accumulated Other Comprehensive Income (Loss)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Net of Tax	22		41
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Fuel derivatives
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification to earnings	(28)		(52)
Less: Tax Expense	(7)		(12)
Net of Tax	21		40
Fuel derivatives | Reclassification out of Accumulated Other Comprehensive Income (Loss)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Fuel and oil	14		36
Other (gains) losses, net	14		16
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		0
Net of Tax	$ 1		$ 1

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Fuel costs incurred that are directly related to goods produced and sold and services rendered during the reporting period.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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