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v3.21.2

Investments (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) railroad | Jun. 30, 2020 USD ($) | 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% |  | 58.00% |  |
Conrail Voting |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 50.00% |  | 50.00% |  |
Conrail Inc |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Equity method investments | $ 1,500 |  | $ 1,500 |  | $ 1,400
Expenses from transactions with related party | 37 | $ 30 | 71 | $ 65 |
Equity in the earnings of investee | 14 | 13 | 28 | 22 |
Due to affiliate, noncurrent | $ 534 |  | $ 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% |  | 19.65% |  |
Expenses from transactions with related party | $ 61 | 58 | $ 124 | 118 |
Equity in the earnings of investee | $ 14 | $ 10 | $ 31 | $ 14 |

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