Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Operating Activities
Net income	$ 1,377	$ 1,214
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	695	675
Deferred income taxes	84	12
Other, net	(113)	(153)
Changes in current assets and liabilities:
Accounts receivable, net	(57)	(44)
Materials and supplies	(88)	31
Other current assets	25	113
Accounts payable and other current liabilities	372	99
Net cash provided by operating activities	2,295	1,947
Investing Activities
Capital expenditures excluding equipment	(641)	(621)
Acquisition of equipment	(103)	(31)
Other, net	(69)	(66)
Net cash used in investing activities	(813)	(718)
Financing Activities
Payments on long-term debt and finance leases	(503)	(2)
Cash distributions	(1,000)	(700)
Other, net	(1)	0
Net cash used in financing activities	(1,504)	(702)
Increase (decrease) in cash and cash equivalents	(22)	527
Cash and cash equivalents:
Beginning of period	2,463	2,004
End of period	2,441	2,531
Supplemental Cash Flow Information
Interest paid, net of amounts capitalized	326	311
Capital investments accrued but not yet paid	123	131
Income taxes paid, net of refunds	$ 7	$ 2