Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 2,258	$ 2,329
Accounts receivable, net	1,164	1,198
Materials and supplies	831	829
Current portion of deferred income taxes	0	245
Other current assets	514	337
Total current assets	4,767	4,938
Property and equipment, net of accumulated depreciation of $5,370 and $4,845, respectively	60,528	59,510
Goodwill	14,845	14,845
Intangible assets, net	449	468
Other assets	2,002	1,942
Total assets	82,591	81,703
Current liabilities:
Accounts payable and other current liabilities	3,007	3,244
Long-term debt due within one year	820	389
Total current liabilities	3,827	3,633
Long-term debt	21,369	21,348
Deferred income taxes	19,507	19,072
Intangible liabilities, net	617	667
Casualty and environmental liabilities	589	609
Pension and retiree health and welfare liability	351	353
Other liabilities	994	989
Total liabilities	47,254	46,671
Commitments and contingencies (see Notes 6 and 7)
Equity:
Member's equity	35,290	34,984
Accumulated other comprehensive income	47	48
Total equity	35,337	35,032
Total liabilities and equity	$ 82,591	$ 81,703