Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Activities
Net income	$ 4,477	$ 4,305
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,883	1,842
Deferred income taxes	64	231
Long-term casualty and environmental liabilities, net	(31)	12
Other, net	(120)	(231)
Changes in current assets and liabilities:
Accounts receivable, net	(239)	(125)
Materials and supplies	(133)	(83)
Other current assets	40	(7)
Accounts payable and other current liabilities	249	103
Net cash provided by operating activities	6,190	6,047
Investing Activities
Capital expenditures excluding equipment	(2,415)	(2,021)
Acquisition of equipment	(66)	(106)
Purchases of investments and investments in time deposits	(23)	0
Proceeds from sales of investments and maturities of time deposits	0	1
Other, net	(18)	(24)
Net cash used in investing activities	(2,522)	(2,150)
Financing Activities
Proceeds from issuance of long-term debt	1,000	925
Payments on long-term debt and finance leases	(909)	(888)
Cash distributions	(3,600)	(3,800)
Other, net	(14)	(10)
Net cash used in financing activities	(3,523)	(3,773)
Increase (decrease) in cash and cash equivalents	145	124
Cash and cash equivalents:
Beginning of period	1,758	1,986
End of period	1,903	2,110
Supplemental Cash Flow Information
Interest paid, net of amounts capitalized	802	815
Capital investments accrued but not yet paid	293	193
Income taxes paid, net of refunds	1,447	1,171
Non-cash asset financing	$ 7	$ 12