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Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2019
Schedule of marketable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Millions) | ​ | June 30, 2019 | ​ | December 31, 2018 |
Commercial paper | ​ | $ | 102 | ​ | $ | 366 | ​
Certificates of deposit/time deposits | ​ |  | 34 | ​ |  | 10 | ​
U.S. municipal securities | ​ |  | 3 | ​ |  | 3 | ​
Asset-backed securities | ​ | ​ | — | ​ | ​ | 1 | ​
Current marketable securities | ​ | $ | 139 | ​ | $ | 380 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. municipal securities | ​ | $ | 46 | ​ | $ | 37 | ​
Non-current marketable securities | ​ | $ | 46 | ​ | $ | 37 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total marketable securities | ​ | $ | 185 | ​ | $ | 417 | ​
​
Marketable securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​
(Millions) |  | June 30, 2019 |
Due in one year or less | ​ | $ | 139 | ​
Due after one year through five years | ​ |  | 13 | ​
Due after five years through ten years | ​ |  | 24 | ​
Due after ten years | ​ |  | 9 | ​
Total marketable securities | ​ | $ | 185 | ​
​

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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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