Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Activities
Net income	$ 5,031	$ 5,087	$ 5,946
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,635	2,625	2,528
Deferred income taxes	363	99	10
Other, net	(147)	(169)	(56)
Changes in current assets and liabilities:
Accounts receivable, net	117	(100)	(88)
Materials and supplies	(55)	(46)	(88)
Other current assets	224	173	111
Accounts payable and other current liabilities	(543)	(370)	388
Net cash provided by operating activities	7,625	7,299	8,751
Investing Activities
Capital expenditures excluding equipment	(3,234)	(3,497)	(3,355)
Acquisition of equipment	(456)	(423)	(177)
Purchases of investments and investments in time deposits	(31)	(24)	(23)
Other, net	(65)	(68)	(69)
Net cash used for investing activities	(3,786)	(4,012)	(3,624)
Financing Activities
Proceeds from issuance of long-term debt	1,300	1,600	1,000
Payments on long-term debt and finance leases	(1,265)	(1,562)	(932)
Cash distributions	(4,000)	(3,100)	(5,000)
Other, net	(18)	(15)	(15)
Net cash used for financing activities	(3,983)	(3,077)	(4,947)
Increase (decrease) in cash and cash equivalents	(144)	210	180
Cash and cash equivalents:
Beginning of period	2,148	1,938	1,758
End of period	2,004	2,148	1,938
Supplemental Cash Flow Information
Interest paid, net of amounts capitalized	1,051	1,047	1,020
Capital investments accrued but not yet paid	232	469	307
Income taxes paid, net of refunds	1,353	1,358	1,749
Non-cash asset financing	$ 0	$ 0	$ 176