Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 2,139	$ 1,975
Accounts receivable, net	1,462	1,448
Materials and supplies	789	803
Other current assets	276	408
Total current assets	4,666	4,634
Property and equipment, net of accumulated depreciation of $9,259 and $8,627, respectively	62,507	62,313
Goodwill	14,845	14,845
Intangible assets, net	382	394
Other assets	2,401	2,337
Total assets	84,801	84,523
Current liabilities:
Accounts payable and other current liabilities	3,161	3,169
Long-term debt due within one year	86	740
Total current liabilities	3,247	3,909
Long-term debt	22,448	21,759
Deferred income taxes	13,600	13,452
Casualty and environmental liabilities	490	499
Intangible liabilities, net	426	471
Pension and retiree health and welfare liability	311	310
Other liabilities	1,093	1,114
Total liabilities	41,615	41,514
Commitments and contingencies (see Notes 6 and 7)
Equity:
Member's equity	42,929	42,778
Accumulated other comprehensive income	257	231
Total equity	43,186	43,009
Total liabilities and equity	$ 84,801	$ 84,523