Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 2,470	$ 2,225
Accounts receivable, net	1,370	1,298
Materials and supplies	846	835
Current portion of deferred income taxes	231	358
Other current assets	241	87
Total current assets	5,158	4,803
Property and equipment, net of accumulated depreciation of $3,199 and $2,232, respectively	54,683	52,363
Goodwill	14,819	14,819
Intangible assets, net	589	821
Other assets	2,317	2,224
Total assets	77,566	75,030
Current liabilities:
Accounts payable and other current liabilities	3,516	3,206
Long-term debt due within one year	371	645
Total current liabilities	3,887	3,851
Long-term debt	18,959	16,361
Deferred income taxes	17,355	17,224
Intangible liabilities, net	827	961
Casualty and environmental liabilities	652	677
Pension and retiree health and welfare liability	356	362
Other liabilities	990	982
Total liabilities	43,026	40,418
Commitments and contingencies (see Notes 5 and 6)
Equity:
Member's Equity	34,292	34,367
Accumulated other comprehensive income	248	245
Total equity	34,540	34,612
Total liabilities and equity	$ 77,566	$ 75,030