Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 1,758	$ 1,986
Accounts receivable, net	1,316	1,243
Materials and supplies	864	803
Other current assets	114	91
Total current assets	4,052	4,123
Property and equipment, net of accumulated depreciation of $14,978 and $13,175, respectively	65,714	65,088
Goodwill	14,852	14,851
Operating lease right-of-use assets	1,592	1,928
Other assets	5,227	2,670
Total assets	91,437	88,660
Current liabilities:
Accounts payable and other current liabilities	3,896	3,434
Long-term debt and finance leases due within one year	932	917
Total current liabilities	4,828	4,351
Long-term debt and finance leases	22,287	22,303
Deferred income taxes	15,156	14,626
Operating lease liabilities	1,015	1,286
Casualty and environmental liabilities	427	428
Pension and retiree health and welfare liability	291	314
Other liabilities	984	1,348
Total liabilities	44,988	44,656
Commitments and contingencies (see Note 13)
Equity:
Member’s equity	46,096	43,906
Accumulated other comprehensive income (loss)	353	98
Total equity	46,449	44,004
Total liabilities and equity	91,437	88,660
Accumulated depreciation; property and equipment	$ 14,978	$ 13,175