Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating Activities
Net income	$ 3,732	$ 4,477
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,957	1,883
Deferred income taxes	202	64
Other, net	(127)	(151)
Changes in current assets and liabilities:
Accounts receivable, net	9	(239)
Materials and supplies	(110)	(133)
Other current assets	26	40
Accounts payable and other current liabilities	(611)	249
Net cash provided by operating activities	5,078	6,190
Investing Activities
Capital expenditures excluding equipment	(2,606)	(2,415)
Acquisition of equipment	(252)	(66)
Purchases of investments and investments in time deposits	(24)	(23)
Other, net	(108)	(18)
Net cash used in investing activities	(2,990)	(2,522)
Financing Activities
Proceeds from issuance of long-term debt	1,600	1,000
Payments on long-term debt and finance leases	(1,539)	(909)
Cash distributions	(1,100)	(3,600)
Other, net	(15)	(14)
Net cash used in financing activities	(1,054)	(3,523)
Increase (decrease) in cash and cash equivalents	1,034	145
Cash and cash equivalents:
Beginning of period	1,938	1,758
End of period	2,972	1,903
Supplemental Cash Flow Information
Interest paid, net of amounts capitalized	800	802
Capital investments accrued but not yet paid	406	293
Income taxes paid, net of refunds	1,174	1,447
Non-cash asset financing	$ 0	$ 7