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Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income Loss [Line Items]
Net income	$ 388	$ 584	$ 1,722	$ 1,645
Other, net of deferred taxes	3	(3)	3	(4)
Total other comprehensive income (loss)	129	(239)	552	(165)
Total comprehensive income	517	345	2,274	1,480
Deferred taxes on unrealized gain (loss) on other	2	(2)	2	(1)
AOCI Including Portion Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income Loss [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(499)		(499)		$ (628)	$ (1,051)
Reclassification to earnings	143		491
Changes in fair value	(14)		61
Fuel derivatives
Accumulated Other Comprehensive Income Loss [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(799)		(799)		(993)	(1,666)
Reclassification to earnings	224		769
Changes in fair value	(30)		98
Interest rate derivatives
Accumulated Other Comprehensive Income Loss [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(26)		(26)		(32)	(30)
Reclassification to earnings	3		11
Changes in fair value	3		(7)
Defined benefit plan items
Accumulated Other Comprehensive Income Loss [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	22		22		22	22
Reclassification to earnings	0		0
Changes in fair value	0		0
Deferred Tax
Accumulated Other Comprehensive Income Loss [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	293		293		369	617
Reclassification to earnings	(84)		(289)
Changes in fair value	8		(35)
Other
Accumulated Other Comprehensive Income Loss [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	11		11		$ 6	$ 6
Reclassification to earnings	0		0
Changes in fair value	5		5
Interest rate derivatives
Accumulated Other Comprehensive Income Loss [Line Items]
Unrealized gain (loss) on derivatives, net of tax	4	0	3	3
Deferred taxes on unrealized gain (loss) on derivatives	2	0	1	2
Fuel derivatives
Accumulated Other Comprehensive Income Loss [Line Items]
Unrealized gain (loss) on derivatives, net of tax	122	(236)	546	(164)
Deferred taxes on unrealized gain (loss) on derivatives	$ 72	$ (139)	$ 321	$ (97)

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