Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 4,566	$ 3,218
Accounts receivable, net	1,244	1,272
Materials and supplies	833	825
Other current assets	265	235
Total current assets	6,908	5,550
Property and equipment, net of accumulated depreciation of $7,583 and $6,130, respectively	61,389	61,250
Goodwill	14,845	14,845
Intangible assets, net	421	430
Other assets	2,090	2,047
Total assets	85,653	84,122
Current liabilities:
Accounts payable and other current liabilities	3,507	3,438
Long-term debt due within one year	1,385	735
Total current liabilities	4,892	4,173
Long-term debt	21,856	21,309
Deferred income taxes	19,986	19,866
Casualty and environmental liabilities	577	584
Intangible liabilities, net	543	567
Pension and retiree health and welfare liability	315	321
Other liabilities	1,101	1,130
Total liabilities	49,270	47,950
Commitments and contingencies (see Notes 6 and 7)
Equity:
Member's equity	36,266	36,053
Accumulated other comprehensive income	117	119
Total equity	36,383	36,172
Total liabilities and equity	$ 85,653	$ 84,122