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Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2020
Marketable Securities and Held-to-Maturity Debt Securities |
Schedule of marketable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Millions) | ​ | March 31, 2020 | ​ | December 31, 2019 |
Commercial paper | ​ | $ | 194 | ​ | $ | 85 | ​
Certificates of deposit/time deposits | ​ |  | 6 | ​ |  | 10 | ​
U.S. municipal securities | ​ |  | 24 | ​ |  | 3 | ​
Current marketable securities | ​ | $ | 224 | ​ | $ | 98 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. municipal securities | ​ | $ | 34 | ​ | $ | 43 | ​
Non-current marketable securities | ​ | $ | 34 | ​ | $ | 43 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total marketable securities | ​ | $ | 258 | ​ | $ | 141 | ​
​
Marketable securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​
(Millions) |  | March 31, 2020 |
Due in one year or less | ​ | $ | 224 | ​
Due after one year through five years | ​ |  | 14 | ​
Due after five years through ten years | ​ |  | 20 | ​
Total marketable securities | ​ | $ | 258 | ​
​

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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