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v3.21.1

Investments (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) railroad | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Schedule of Investments [Line Items] |  |  |
Number of North American railroads | railroad | 8 |  |
Equity Method Investee |  |  |
Schedule of Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 58.00% |  |
Conrail Voting |  |  |
Schedule of Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 50.00% |  |
Conrail Inc |  |  |
Schedule of Investments [Line Items] |  |  |
Equity method investments | $ 1,500 |  | $ 1,400
Expenses from transactions with related party | 34 | $ 35 |
Equity in the earnings of investee | 14 | 9 |
Due to affiliate, noncurrent | $ 534 |  | $ 534
Due to affiliate, average interest rate | 1.31% |  | 1.31%
TTX Company |  |  |
Schedule of Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 19.65% |  |
Expenses from transactions with related party | $ 63 | 60 |
Equity in the earnings of investee | $ 17 | $ 4 |

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