Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 2,384		$ 2,225
Accounts receivable, net	1,386		1,298
Materials and supplies	795		835
Current portion of deferred income taxes	355		358
Other current assets	232		87
Total current assets	5,152		4,803
Property and equipment, net of accumulated depreciation of $3,550 and $2,232, respectively	55,806		52,363
Goodwill	14,819		14,819
Intangible assets, net	512		821
Other assets	1,914		2,224
Total assets	78,203		75,030
Current liabilities:
Accounts payable and other current liabilities	3,435		3,206
Long-term debt due within one year	366	[1]	645	[1]
Total current liabilities	3,801		3,851
Long-term debt	18,914	[1]	16,361	[1]
Deferred income taxes	18,001		17,224
Intangible liabilities, net	782		961
Casualty and environmental liabilities	639		677
Pension and retiree health and welfare liability	385		362
Other liabilities	947		982
Total liabilities	43,469		40,418
Commitments and contingencies (see Notes 11 and 12)
Equity:
Member's Equity	34,736		34,367
Accumulated other comprehensive income (loss)	(2)		245
Total equity	34,734		34,612
Total liabilities and equity	$ 78,203		$ 75,030

[1] Amounts represent debt outstanding and weighted average effective interest rates for 2014 and 2013, respectively. Maturities are as of December 31, 2014.