Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 1,852	$ 1,984
Accounts receivable, net	1,389	1,401
Materials and supplies	735	789
Other current assets	114	113
Total current assets	4,090	4,287
Property and equipment, net of accumulated depreciation of $12,198 and $12,101, respectively	64,600	64,533
Goodwill	14,851	14,851
Operating lease right-of-use assets	2,189	2,285
Other assets	2,642	2,618
Total assets	88,372	88,574
Current liabilities:
Accounts payable and other current liabilities	3,585	3,634
Long-term debt and finance leases due within one year	676	571
Total current liabilities	4,261	4,205
Long-term debt and finance leases	22,489	22,640
Deferred income taxes	14,441	14,353
Operating lease liabilities	1,421	1,632
Casualty and environmental liabilities	432	442
Pension and retiree health and welfare liability	282	285
Other liabilities	1,235	1,297
Total liabilities	44,561	44,854
Commitments and contingencies (see Note 5)
Equity:
Member’s equity	43,665	43,575
Accumulated other comprehensive income (loss)	146	145
Total equity	43,811	43,720
Total liabilities and equity	$ 88,372	$ 88,574