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Investments - Schedule of Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Long-term investments: $ 3,184 $ 3,048
COLI at net cash surrender value 161 774
Other investments 25 17
Total long-term investments 3,370 3,839
Conrail    
Schedule of Investments [Line Items]    
Long-term investments: 1,748 1,656
TTX    
Schedule of Investments [Line Items]    
Long-term investments: 1,013 964
Other    
Schedule of Investments [Line Items]    
Long-term investments: $ 423 $ 428