Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 2,280	$ 1,975
Accounts receivable, net	1,576	1,448
Materials and supplies	826	803
Other current assets	249	408
Total current assets	4,931	4,634
Property and equipment, net of accumulated depreciation of $9,596 and $8,627, respectively	62,800	62,313
Goodwill	14,851	14,845
Intangible assets, net	382	394
Other assets	2,343	2,337
Total assets	85,307	84,523
Current liabilities:
Accounts payable and other current liabilities	3,301	3,169
Long-term debt due within one year	86	740
Total current liabilities	3,387	3,909
Long-term debt	23,171	21,759
Deferred income taxes	13,734	13,452
Casualty and environmental liabilities	486	499
Intangible liabilities, net	403	471
Pension and retiree health and welfare liability	313	310
Other liabilities	1,110	1,114
Total liabilities	42,604	41,514
Commitments and contingencies (see Notes 7 and 8)
Equity:
Member's equity	42,447	42,778
Accumulated other comprehensive income (loss)	256	231
Total equity	42,703	43,009
Total liabilities and equity	$ 85,307	$ 84,523