Consolidated Balance Sheets (Successor, USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Successor
Current assets:
Cash and cash equivalents	$ 1,960	$ 2,087
Accounts receivable, net	1,150	928
Materials and supplies	739	652
Current portion of deferred income taxes	295	317
Other current assets	121	193
Total current assets	4,265	4,177
Property and equipment, net of accumulated depreciation of $1056 and $660, respectively	48,047	45,486
Goodwill	14,803	14,803
Intangible assets, net	1,420	1,732
Other assets	1,845	2,449
Total assets	70,380	68,647
Current liabilities:
Accounts payable and other current liabilities	3,143	2,768
Long-term debt due within one year	526	699
Total current liabilities	3,669	3,467
Deferred income taxes	15,637	14,307
Long-term debt	12,139	11,281
Intangible liabilities, net	1,496	1,790
Casualty and environmental liabilities	905	938
Pension and retiree health and welfare liability	769	490
Other liabilities	1,016	867
Total liabilities	35,631	33,140
Commitments and contingencies (see Notes 6, 13 and 14)
Equity:
Member's equity (see Note 2)	34,952	35,480
Accumulated other comprehensive (loss) income	(203)	27
Total equity	34,749	35,507
Total liabilities and equity	$ 70,380	$ 68,647