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Investments - Schedule of Investments (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |
Long-term investments: | $ 2,923 | $ 2,797
COLI at net cash surrender value | 752 | 885
Other investments | 19 | 25
Total long-term investments | 3,694 | 3,707
Conrail |  |
Schedule of Investments [Line Items] |  |
Long-term investments: | 1,584 | 1,526
TTX Company |  |
Schedule of Investments [Line Items] |  |
Long-term investments: | 918 | 851
Other |  |
Schedule of Investments [Line Items] |  |
Long-term investments: | $ 421 | $ 420

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