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AOCI - Differences between Net Income and Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Condensed Statement of Income Captions [Line Items]
NET INCOME	$ 659			$ 615			$ 1,787	$ 1,811
Other, net of deferred taxes	2			6			18	9
Total other comprehensive income (loss)	(93)			114			(83)	418
Comprehensive income	566	$ 675	$ 463	729	$ 953	$ 547	1,704	2,229
Other deferred taxes	0			1			5	1
Fuel derivatives
Condensed Statement of Income Captions [Line Items]
Unrealized gain (loss) on derivative instruments, net of deferred taxes	(80)			107			(61)	404
Derivative deferred taxes	(24)			32			(18)	123
Interest rate derivatives
Condensed Statement of Income Captions [Line Items]
Unrealized gain (loss) on derivative instruments, net of deferred taxes	(15)			1			(40)	5
Derivative deferred taxes	$ (5)			$ 0			$ (13)	$ 1

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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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