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AOCI - Schedule of AOCI Components (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Fuel derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ (31)	$ (56)
Changes in fair value	(123)	(107)
Ending Balance	(135)	(135)
Interest rate derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(33)	0
Changes in fair value	(22)	(56)
Reclassification to earnings	2	3
Ending Balance	(53)	(53)
Defined Benefit Plan Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	58	58
Changes in fair value	0	0
Reclassification to earnings	0	0
Ending Balance	58	58
Other comprehensive income other changes net of tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	45	25
Changes in fair value	2	22
Reclassification to earnings	0	0
Ending Balance	47	47
Deferred Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(9)	(7)
Changes in fair value	33	33
Reclassification to earnings	(4)	(6)
Ending Balance	20	20
AOCI Including Portion Attributable to Noncontrolling Interest
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	30	20
Changes in fair value	(110)	(108)
Reclassification to earnings	17	25
Ending Balance	(63)	(63)
Reclassification out of Accumulated Other Comprehensive Income | Fuel derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification to earnings	$ (19)	$ (28)

X

- Definition

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

+ References

No definition available.

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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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