CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE OPERATIONS (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Income	$ 198	$ 289	$ 457	$ 430
Related to marketable securities:
Unrealized holding gains (losses) arising during the period	(4)	4	3	(8)
Reclassification of (gains) losses into Other-net nonoperating income (expense)	(1)	0	(2)	(2)
Income tax effect	2	(1)	0	4
Marketable securities, net of tax	(3)	3	1	(6)
Related to employee benefit plans:
Reclassification of net pension expense into Wages and benefits	2	11	7	32
Income tax effect	(1)	(5)	(3)	(12)
Employee benefit plans, net of tax	1	6	4	20
Related to interest rate derivative instruments:
Unrealized holding gains (losses) arising during the period	0	(1)	(5)	9
Reclassification of (gains) losses into Aircraft rent	2	1	5	4
Income tax effect	0	1	0	(5)
Interest rate derivative instruments, net of tax	2	1	0	8
Other comprehensive income	0	10	5	22
Comprehensive income	$ 198	$ 299	$ 462	$ 452