Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Operating revenues:
Total operating revenues	$ 6,864	$ 6,154	$ 13,081	$ 12,181
Operating expenses:
Compensation and benefits	1,240	1,249	2,467	2,461
Fuel	938	576	1,581	1,179
Purchased services and materials	709	642	1,382	1,273
Depreciation	638	613	1,271	1,223
Equipment and other rents	214	230	433	471
Other	362	319	726	678
Total operating expenses	4,101	3,629	7,860	7,285
Operating income	2,763	2,525	5,221	4,896
Other income, net (Note 6)	105	123	196	201
Interest expense	(313)	(335)	(633)	(657)
Income before income taxes	2,555	2,313	4,784	4,440
Income tax expense (Note 7)	(562)	(437)	(1,090)	(938)
Net income	$ 1,993	$ 1,876	$ 3,694	$ 3,502
Share and per share (Note 8):
Earnings per share - basic (in dollars per share)	$ 3.36	$ 3.16	$ 6.23	$ 5.86
Earnings per share - diluted (in dollars per share)	$ 3.36	$ 3.15	$ 6.22	$ 5.85
Weighted average number of shares - basic (in shares)	593.4	594.1	593.2	597.5
Weighted average number of shares - diluted (in shares)	594.0	594.8	593.8	598.4
Freight revenues
Operating revenues:
Total operating revenues	$ 6,518	$ 5,843	$ 12,411	$ 11,534
Other revenues
Operating revenues:
Total operating revenues	$ 346	$ 311	$ 670	$ 647

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Operating activities
Net income	$ 1,993	$ 1,876	$ 3,694	$ 3,502
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	638	613	1,271	1,223
Deferred and other income taxes			93	(123)
Other operating activities, net			6	(43)
Changes in current assets and liabilities:
Accounts receivable, net			(270)	(21)
Materials and supplies			(132)	(5)
Other current assets			(26)	(49)
Accounts payable and other current liabilities			52	(203)
Income and other taxes			828	262
Cash provided by operating activities			5,516	4,543
Investing activities
Capital investments			(1,810)	(1,842)
Other investing activities, net			(254)	3
Cash used in investing activities			(2,064)	(1,839)
Financing activities
Dividends paid			(1,640)	(1,599)
Debt repaid			(1,506)	(409)
Share repurchase programs (Note 16)			(26)	(2,679)
Debt issued (Note 14)			0	1,995
Other financing activities, net			63	43
Cash used in financing activities			(3,109)	(2,649)
Net change in cash, cash equivalents, and restricted cash			343	55
Cash, cash equivalents, and restricted cash at beginning of year			1,280	1,028
Cash, cash equivalents, and restricted cash at end of period	1,623	1,083	1,623	1,083
Non-cash investing and financing activities:
Capital investments accrued but not yet paid			140	157
Cash paid during the period for:
Income taxes, net of refunds			(236)	(785)
Interest, net of amounts capitalized			(638)	(610)
Reconciliation of cash, cash equivalents, and restricted cash to the Condensed Consolidated Statement of Financial Position:
Cash and cash equivalents	1,614	1,060	1,614	1,060
Restricted cash equivalents in other current assets	2	18	2	18
Restricted cash equivalents in other assets	7	5	7	5
Total cash, cash equivalents, and restricted cash equivalents per above	$ 1,623	$ 1,083	$ 1,623	$ 1,083

Condensed Consolidated Statements of Financial Position (Unaudited) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Current assets:
Cash and cash equivalents	$ 1,614	$ 1,266
Short-term investments (Note 13)	500	250
Accounts receivable, net (Note 10)	2,130	1,860
Materials and supplies	919	787
Other current assets	370	392
Total current assets	5,533	4,555
Investments	2,977	2,885
Properties, net (Note 11)	60,199	59,645
Operating lease assets	875	1,036
Other assets	1,627	1,577
Total assets	71,211	69,698
Current liabilities:
Accounts payable and other current liabilities (Note 12)	4,324	3,494
Debt due within one year (Note 14)	1,288	1,520
Total current liabilities	5,612	5,014
Debt due after one year (Note 14)	29,039	30,294
Operating lease liabilities	609	738
Deferred income taxes	13,525	13,421
Other long-term liabilities	1,753	1,764
Commitments and contingencies (Note 15)
Total liabilities	50,538	51,231
Common shareholders' equity:
Common shares, $2.50 par value, 1,400,000,000 authorized; 1,113,359,575 and 1,113,161,191 issued; 593,957,035 and 593,245,884 outstanding, respectively	2,783	2,783
Paid-in-surplus	5,677	5,589
Retained earnings	71,584	69,529
Treasury stock	(58,815)	(58,843)
Accumulated other comprehensive loss (Note 9)	(556)	(591)
Total common shareholders' equity	20,673	18,467
Total liabilities and common shareholders' equity	$ 71,211	$ 69,698