Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 2,225		$ 1,794
Accounts receivable, net	1,298		1,168
Materials and supplies	835		800
Current portion of deferred income taxes	358		341
Other current assets	87		78
Total current assets	4,803		4,181
Property and equipment, net of accumulated depreciation of $2,232 and $1,626, respectively	52,363		50,070
Goodwill	14,819		14,819
Intangible assets, net	821		1,128
Other assets	2,224		1,816
Total assets	75,030		72,014
Current liabilities:
Accounts payable and other current liabilities	3,206		3,120
Long-term debt due within one year	645	[1]	453	[1]
Total current liabilities	3,851		3,573
Deferred income taxes	17,224		16,319
Long-term debt	16,361	[1]	14,080	[1]
Intangible liabilities, net	961		1,214
Casualty and environmental liabilities	677		750
Pension and retiree health and welfare liability	362		786
Other liabilities	982		963
Total liabilities	40,418		37,685
Commitments and contingencies (see Notes 4, 11 and 12)
Equity:
Member's Equity	34,367		34,574
Accumulated other comprehensive income ( loss)	245		(245)
Total equity	34,612		34,329
Total liabilities and equity	$ 75,030		$ 72,014

[1] Amounts represent debt outstanding and weighted average effective interest rates for 2013 and 2012, respectively. Maturities are as of December 31, 2013.