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Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2021
Marketable Securities. |
Schedule of marketable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Millions) | ​ | March 31, 2021 | ​ | December 31, 2020 |
Corporate debt securities | ​ | $ | 7 | ​ | $ | 7 | ​
Commercial paper | ​ | ​ | 384 | ​ | ​ | 237 | ​
Certificates of deposit/time deposits | ​ |  | 7 | ​ |  | 31 | ​
U.S. treasury securities | ​ | ​ | 100 | ​ | ​ | 125 | ​
U.S. municipal securities | ​ |  | 3 | ​ |  | 4 | ​
Current marketable securities | ​ | $ | 501 | ​ | $ | 404 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. municipal securities | ​ | $ | 31 | ​ | $ | 30 | ​
Non-current marketable securities | ​ | $ | 31 | ​ | $ | 30 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total marketable securities | ​ | $ | 532 | ​ | $ | 434 | ​
​
Schedule of marketable securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​
(Millions) |  | March 31, 2021 |
Due in one year or less | ​ | $ | 501 | ​
Due after one year through five years | ​ |  | 15 | ​
Due after five years through ten years | ​ |  | 16 | ​
Total marketable securities | ​ | $ | 532 | ​

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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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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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