Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 3,040	$ 2,384
Accounts receivable, net	1,400	1,386
Materials and supplies	801	795
Current portion of deferred income taxes	247	355
Other current assets	209	232
Total current assets	5,697	5,152
Property and equipment, net of accumulated depreciation of $4,610 and $3,550, respectively	58,446	55,806
Goodwill	14,831	14,819
Intangible assets, net	477	512
Other assets	2,052	1,914
Total assets	81,503	78,203
Current liabilities:
Accounts payable and other current liabilities	3,647	3,435
Long-term debt due within one year	323	366
Total current liabilities	3,970	3,801
Long-term debt	21,559	18,914
Deferred income taxes	18,387	18,001
Intangible liabilities, net	694	782
Casualty and environmental liabilities	632	639
Pension and retiree health and welfare liability	378	385
Other liabilities	986	947
Total liabilities	$ 46,606	$ 43,469
Commitments and contingencies (see Notes 6 and 7)
Equity:
Member's equity	$ 34,900	$ 34,736
Accumulated other comprehensive income	(3)	(2)
Total equity	34,897	34,734
Total liabilities and equity	$ 81,503	$ 78,203