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Investment in Affiliates and Related-Party Transactions - Equity-method Investments in Affiliates (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Related Party Transaction [Line Items] |  |
Total | $ 2,292 | $ 2,099
Corporate Joint Venture | Conrail |  |
Related Party Transaction [Line Items] |  |
Total | 1,124 | 1,083
Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Total | 2,292 | 2,099
Affiliated Entity | TTX |  |
Related Party Transaction [Line Items] |  |
Total | 914 | 849
Affiliated Entity | Other (a) |  |
Related Party Transaction [Line Items] |  |
Total | $ 254 | $ 167

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- Definition Amount of investment in equity method investee and investment in and advance to affiliate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(18)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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