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Investments - Schedule of Investments (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
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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