Consolidated Statements of Income (USD $) In Millions, unless otherwise specified	11 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended
	Dec. 31, 2010 Successor	Dec. 31, 2011 Successor	Feb. 12, 2010 Predecessor	Dec. 31, 2009 Predecessor
Revenues	$ 15,059	$ 19,548	$ 1,791	$ 14,016
Operating expenses:
Compensation and benefits	3,562	4,315	442	3,481
Fuel	2,687	4,267	329	2,372
Purchased services	1,890	2,218	279	1,873
Depreciation and amortization	1,532	1,807	192	1,537
Equipment rents	670	779	97	777
Materials and other	665	852	1	714
Total operating expenses	11,006	14,238	1,340	10,754
Operating income	4,053	5,310	451	3,262
Interest expense	435	560	72	613
Other expense, net	7	9	2	8
Income before income taxes	3,611	4,741	377	2,641
Income tax expense	1,376	1,769	153	920
Net income	$ 2,235	$ 2,972	$ 224	$ 1,721