Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 1,991	$ 1,985
Accounts receivable, net	1,404	1,499
Materials and supplies	813	793
Other current assets	118	257
Total current assets	4,326	4,534
Property and equipment, net of accumulated depreciation of $10,865 and $10,004, respectively	63,222	63,185
Goodwill	14,851	14,851
Operating lease right-of-use assets	2,609	0
Intangible assets, net of accumulated amortization of $288 and $279, respectively	364	373
Other assets	2,303	2,150
Total assets	87,675	85,093
Current liabilities:
Accounts payable and other current liabilities	3,836	3,261
Long-term debt due within one year	871	830
Total current liabilities	4,707	4,091
Long-term debt	22,346	22,396
Deferred income taxes	13,932	13,795
Operating lease liabilities	1,809	0
Casualty and environmental liabilities	482	486
Intangible liabilities, net	374	381
Pension and retiree health and welfare liability	272	267
Other liabilities	989	1,028
Total liabilities	44,911	42,444
Commitments and contingencies (see Notes 7 and 8)
Equity:
Member's equity	42,572	42,519
Accumulated other comprehensive income (loss)	192	130
Total equity	42,764	42,649
Total liabilities and equity	$ 87,675	$ 85,093