Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 1,926	$ 2,225
Accounts receivable, net	1,320	1,298
Materials and supplies	866	835
Current portion of deferred income taxes	219	358
Other current assets	147	87
Total current assets	4,478	4,803
Property and equipment, net of accumulated depreciation of $2,904 and $2,232, respectively	53,627	52,363
Goodwill	14,819	14,819
Intangible assets, net	666	821
Other assets	2,348	2,224
Total assets	75,938	75,030
Current liabilities:
Accounts payable and other current liabilities	3,461	3,206
Long-term debt due within one year	376	645
Total current liabilities	3,837	3,851
Long-term debt	17,505	16,361
Deferred income taxes	17,161	17,224
Intangible liabilities, net	872	961
Casualty and environmental liabilities	661	677
Pension and retiree health and welfare liability	358	362
Other liabilities	1,039	982
Total liabilities	41,433	40,418
Commitments and contingencies (see Notes 5 and 6)
Equity:
Member's Equity	34,257	34,367
Accumulated other comprehensive income	248	245
Total equity	34,505	34,612
Total liabilities and equity	$ 75,938	$ 75,030