Supplemental Financial Information (Tables)

6 Months Ended

Jun. 30, 2013

Supplemental Financial Information [Abstract]

Other Assets

	June 30,		December 31,
(in millions)	2013		2012
Fuel derivative contracts	$	9	$	221
Interest rate derivative contracts	22		31
Receivable from third parties for fuel contracts - noncurrent	27		54
Intangible assets	127		138
Non-current investments	41		41
Other	158		148
Other assets	$	384	$	633

Accrued Liabilities

	June 30,		December 31,
(in millions)	2013		2012
Retirement plans	$	222	$	135
Aircraft rentals	130		139
Vacation pay	281		270
Health	61		70
Fuel derivative contracts	36		50
Workers compensation	156		159
Accrued taxes	119		67
Other	202		212
Accrued liabilities	$	1,207	$	1,102

Other Noncurrent Liabilities

	June 30,		December 31,
(in millions)	2013		2012
Postretirement obligation	$	162	$	148
Non-current lease-related obligations	340		376
Airport construction obligation	404		331
Other deferred compensation	147		141
Fuel derivative contracts	30		—
Interest rate derivative contracts	49		37
Other	79		91
Other non-current liabilities	$	1,211	$	1,124