Railway Operating Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Total	$ 12,180	$ 12,123	$ 12,156
Merchandise
Disaggregation of Revenue [Line Items]
Total	7,684	7,470	7,353
Merchandise | Agriculture, forest and consumer products
Disaggregation of Revenue [Line Items]
Total	2,538	2,521	2,530
Merchandise | Chemicals
Disaggregation of Revenue [Line Items]
Total	2,206	2,123	2,054
Merchandise | Metals and construction
Disaggregation of Revenue [Line Items]
Total	1,724	1,682	1,634
Merchandise | Automotive
Disaggregation of Revenue [Line Items]
Total	1,216	1,144	1,135
Intermodal
Disaggregation of Revenue [Line Items]
Total	3,009	3,042	3,090
Coal
Disaggregation of Revenue [Line Items]
Total	$ 1,487	$ 1,611	$ 1,713