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AOCI - Schedule of AOCI Components (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Fuel derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ (209)	$ (125)
Changes in fair value	11	(97)
Ending Balance	(170)	(170)
Interest rate derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(75)	(33)
Changes in fair value	0	(42)
Reclassification to earnings	1	1
Ending Balance	(74)	(74)
Defined Benefit Plan Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	20	20
Changes in fair value	0	0
Reclassification to earnings	0	0
Ending Balance	20	20
Other comprehensive income (loss) other changes net of tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	22	59
Changes in fair value	33	(4)
Reclassification to earnings	0	0
Ending Balance	55	55
Deferred Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	56	18
Changes in fair value	(10)	33
Reclassification to earnings	(7)	(12)
Ending Balance	39	39
AOCI Including Portion Attributable to Noncontrolling Interest
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(186)	(61)
Changes in fair value	34	(110)
Reclassification to earnings	22	41
Ending Balance	(130)	(130)
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Fuel derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification to earnings	$ 28	$ 52

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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- Definition

Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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