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Investments (Tables) | 3 Months Ended
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Apr. 03, 2021
Investments |
Summary of the estimated fair value of short-term investments classified as trading securities | ​
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​ | ​ | April 3, | ​ | December 31, | ​
(Millions of dollars) |  | 2021 | ​ | 2020 | ​
Domestic equity securities | ​ | $ | 697 | ​ | $ | 702 | ​
Domestic debt securities | ​ | ​ | 392 | ​ | ​ | 496 | ​
Foreign equity securities | ​ | ​ | 149 | ​ | ​ | 133 | ​
Foreign debt securities | ​ | ​ | 106 | ​ | ​ | 68 | ​
Money market funds held in trading accounts | ​ |  | 18 | ​ |  | 47 | ​
Other trading securities | ​ | ​ | 22 | ​ | ​ | 19 | ​
Total trading short-term investments | ​ | $ | 1,384 | ​ | $ | 1,465 | ​

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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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