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Investments - Schedule of Investments (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Schedule of Investments [Line Items] |  |
Long-term investments: | $ 2,797 | $ 2,662
COLI at net cash surrender value | 885 | 902
Other investments | 25 | 26
Total long-term investments | 3,707 | 3,590
Conrail |  |
Schedule of Investments [Line Items] |  |
Long-term investments: | 1,526 | 1,446
TTX Company |  |
Schedule of Investments [Line Items] |  |
Long-term investments: | 851 | 798
Other |  |
Schedule of Investments [Line Items] |  |
Long-term investments: | $ 420 | $ 418

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