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Investments (Tables) | 12 Months Ended
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Dec. 31, 2023
Investments |
Summary of the estimated fair value of short-term investments classified as trading securities | ​
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​ | ​ | ​ | ​ | December 31, |
(Millions of dollars) | ​ | ​ | 2023 | ​ | ​ | 2022 | ​
Domestic equity securities | ​ | ​ | $ | 143 | ​ | ​ | $ | 433 | ​
Foreign equity securities | ​ | ​ | ​ | 96 | ​ | ​ | ​ | 169 | ​
Domestic debt securities | ​ | ​ |  | 593 | ​ | ​ |  | 399 | ​
Foreign debt securities | ​ | ​ | ​ | 120 | ​ | ​ | ​ | 66 | ​
Money market funds held in trading accounts | ​ | ​ | ​ | 17 | ​ | ​ | ​ | 12 | ​
Other trading securities | ​ | ​ | ​ | 4 | ​ | ​ | ​ | 7 | ​
Total trading short-term investments | ​ | ​ | $ | 973 | ​ | ​ | $ | 1,086 | ​

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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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