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Investments (Tables) | 12 Months Ended
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Dec. 31, 2021
Investments [Abstract] |
Investments |
| December 31,
| 2021 |  | 2020
| ($ in millions)
Long-term investments: |  |  |
Equity method investments: |  |  |
Conrail | $ | 1,526 |  |  | $ | 1,446 |
TTX Company | 851 |  |  | 798 |
Other | 420 |  |  | 418 |
Total equity method 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 |

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- Definition Tabular disclosure of investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -URI http://asc.fasb.org/topic&trid=2197064 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -URI http://asc.fasb.org/topic&trid=75115024 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -URI http://asc.fasb.org/topic&trid=2196965 + Details
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