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AOCI - Differences between Net Income and Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Condensed Statement of Income Captions [Line Items]
Net income (loss)	$ (915)		$ 741		$ (1,009)	$ 1,128
Other, net of deferred taxes	25		5		(3)	16
Total other comprehensive income (loss)	56		(66)		(69)	10
Comprehensive income (loss)	(859)	$ (219)	675	$ 463	(1,078)	1,138
Other deferred taxes	8		1		(1)	4
Fuel derivatives
Condensed Statement of Income Captions [Line Items]
Unrealized gain (loss) on derivative instruments, net of deferred taxes	30		(56)		(35)	19
Derivative deferred taxes	9		(17)		(10)	6
Interest rate derivatives
Condensed Statement of Income Captions [Line Items]
Unrealized gain (loss) on derivative instruments, net of deferred taxes	1		(15)		(31)	(25)
Derivative deferred taxes	$ 0		$ (4)		$ (10)	$ (8)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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