Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Summarized Financial Data

Unaudited summarized financial data by quarter for 2012 and 2011 (in millions, except per share amounts):

	First     Quarter			Second     Quarter			Third     Quarter			Fourth     Quarter
2012
Operating revenues	$	6,037		$	6,452		$	6,429		$	5,937
Operating income (loss)	(89		)	142			51			3
Net earnings (loss)	(1,660		)	(241		)	(238		)	263
Earnings (loss) per share:
Basic	(4.95		)	(0.72		)	(0.71		)	0.78
Diluted	(4.95		)	(0.72		)	(0.71		)	0.69
2011
Operating revenues	$	5,533		$	6,114		$	6,376		$	5,956
Operating income (loss)	(232		)	(78		)	39			(783		)
Net earnings (loss)	(436		)	(286		)	(162		)	(1,095		)
Earnings (loss) per share:
Basic	(1.31		)	(0.85		)	(0.48		)	(3.27		)
Diluted	(1.31		)	(0.85		)	(0.48		)	(3.27		)