Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Operating Activities
Net income	$ 5,476	$ 5,031	$ 5,087
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,737	2,635	2,625
Deferred income taxes	315	363	99
Other, net	(489)	(147)	(169)
Changes in current assets and liabilities:
Accounts receivable, net	67	117	(100)
Materials and supplies	(3)	(55)	(46)
Other current assets	372	224	173
Accounts payable and other current liabilities	(349)	(543)	(370)
Net cash provided by operating activities	8,126	7,625	7,299
Investing Activities
Capital expenditures excluding equipment	(3,272)	(3,234)	(3,497)
Acquisition of equipment	(525)	(456)	(423)
Purchases of investments and investments in time deposits	(2)	(31)	(24)
Other, net	(28)	(65)	(68)
Net cash used for investing activities	(3,827)	(3,786)	(4,012)
Financing Activities
Proceeds from issuance of long-term debt	1,850	1,300	1,600
Payments on long-term debt and finance leases	(1,263)	(1,265)	(1,562)
Cash distributions	(4,400)	(4,000)	(3,100)
Other, net	(27)	(18)	(15)
Net cash used for financing activities	(3,840)	(3,983)	(3,077)
Increase (decrease) in cash and cash equivalents	459	(144)	210
Cash and cash equivalents:
Beginning of period	2,004	2,148	1,938
End of period	2,463	2,004	2,148
Supplemental Cash Flow Information
Interest paid, net of amounts capitalized	1,106	1,051	1,047
Capital investments accrued but not yet paid	255	232	469
Income taxes paid, net of refunds	$ 1,368	$ 1,353	$ 1,358