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Supplemental Balance Sheet Information (Tables) | 12 Months Ended
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Dec. 31, 2019
Supplemental Balance Sheet Information |
Schedule of other current liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ |  | 2019 |  | 2018 |
Other current liabilities | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accrued payroll and employee benefits |  | $ | 207 | ​ | $ | 182 | ​
Accrued interest | ​ | ​ | 169 | ​ | ​ | 184 | ​
Accrued taxes, other than income | ​ | ​ | 73 | ​ | ​ | 69 | ​
Finance lease liability | ​ | ​ | 35 | ​ | ​ | — | ​
Operating lease liabilities | ​ | ​ | 13 | ​ | ​ | — | ​
Deferred revenues | ​ | ​ | 100 | ​ | ​ | 87 | ​
Contingent liabilities | ​ | ​ | 180 | ​ | ​ | 213 | ​
Other | ​ | ​ | 4 | ​ | ​ | 11 | ​
Total other current liabilities |  | $ | 781 | ​ | $ | 746 | ​
Schedule of other long term liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ |  | 2019 |  | 2018 |
Other long-term liabilities | ​ | ​ | ​ | ​ | ​ | ​ | ​
Postemployment benefit plan obligations |  | $ | 346 | ​ | $ | 355 | ​
Finance lease liability | ​ | ​ | 444 | ​ | ​ | — | ​
Operating lease liabilities | ​ | ​ | 116 | ​ | ​ | — | ​
Income taxes payable | ​ | ​ | 179 | ​ | ​ | 476 | ​
Deferred revenues | ​ | ​ | 429 | ​ | ​ | 399 | ​
Construction contract intangible liability | ​ | ​ | — | ​ | ​ | 132 | ​
Other | ​ | ​ | 41 | ​ | ​ | 62 | ​
Total other long-term liabilities |  | $ | 1,555 | ​ | $ | 1,424 | ​

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