Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Operating Activities
Net income	$ 2,370	$ 2,511
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,327	1,300
Deferred income taxes	60	111
Other, net	(86)	(81)
Changes in current assets and liabilities:
Accounts receivable, net	53	72
Materials and supplies	(17)	17
Other current assets	42	(21)
Accounts payable and other current liabilities	(570)	(812)
Net cash provided by operating activities	3,179	3,097
Investing Activities
Capital expenditures excluding equipment	(1,524)	(1,605)
Acquisition of equipment	(232)	(72)
Purchases of investments and investments in time deposits	(29)	(21)
Other, net	(130)	(176)
Net cash used in investing activities	(1,915)	(1,874)
Financing Activities
Proceeds from issuance of long-term debt	1,300	1,600
Payments on long-term debt and finance leases	(530)	(737)
Cash distributions	(2,100)	(1,100)
Other, net	(16)	(13)
Net cash used in financing activities	(1,346)	(250)
Increase (decrease) in cash and cash equivalents	(82)	973
Cash and cash equivalents:
Beginning of period	2,148	1,938
End of period	2,066	2,911
Supplemental Cash Flow Information
Interest paid, net of amounts capitalized	529	517
Capital investments accrued but not yet paid	184	362
Income taxes paid, net of refunds	$ 731	$ 825