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Investments - Schedule of Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Long-term investments: $ 3,048 $ 2,923
COLI at net cash surrender value 774 752
Other investments 17 19
Total long-term investments 3,839 3,694
Conrail    
Schedule of Investments [Line Items]    
Long-term investments: 1,656 1,584
TTX    
Schedule of Investments [Line Items]    
Long-term investments: 964 918
Other    
Schedule of Investments [Line Items]    
Long-term investments: $ 428 $ 421