Supplemental Financial Information (Tables)

3 Months Ended

Mar. 31, 2013

Supplemental Financial Information [Abstract]

Other Assets

	March 31,		December 31,
(in millions)	2013		2012
Fuel derivative contracts	$	172	$	221
Interest rate derivative contracts	29		31
Receivable from third parties for fuel contracts - noncurrent	54		54
Intangible assets	132		138
Non-current investments	43		41
Other	153		148
Other assets	$	583	$	633

Accrued Liabilities

	March 31,		December 31,
(in millions)	2013		2012
Retirement plans	$	144	$	135
Aircraft rentals	109		139
Vacation pay	275		270
Health	62		70
Fuel derivative contracts	—		50
Workers compensation	158		159
Accrued taxes	58		67
Other	198		212
Accrued liabilities	$	1,004	$	1,102

Other Noncurrent Liabilities

	March 31,		December 31,
(in millions)	2013		2012
Postretirement obligation	$	154	$	148
Non-current lease-related obligations	349		376
Airport construction obligation	359		331
Other deferred compensation	144		141
Fuel derivative contracts	12		—
Interest rate derivative contracts	54		37
Other	81		91
Other non-current liabilities	$	1,153	$	1,124