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Investments (Tables) | 12 Months Ended
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Dec. 31, 2023
Investments [Abstract] |
Investments |
| December 31,
| 2023 |  | 2022
| ($ in millions)
Long-term investments: |  |  |
Equity method investments: |  |  |
Conrail | $ | 1,656 |  |  | $ | 1,584 |
TTX | 964 |  |  | 918 |
Other | 428 |  |  | 421 |
Total equity method investments | 3,048 |  |  | 2,923 |
COLI at net cash surrender value | 774 |  |  | 752 |
Other investments | 17 |  |  | 19 |
Total long-term investments | $ | 3,839 |  |  | $ | 3,694 |

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- Definition Tabular disclosure of investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//320/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Topic 321 -Publisher FASB -URI https://asc.fasb.org//321/tableOfContent Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Topic 325 -Publisher FASB -URI https://asc.fasb.org//325/tableOfContent + Details
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