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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2019
Financial Instruments |
Carrying amounts and fair values of the financial instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019 | ​ | December 31, 2018 |
​ | ​ | Carrying | ​ | Fair | ​ | Carrying | ​ | Fair |
​ |  | amount |  | value |  | amount |  | value |
Cash and cash equivalents |  | $ | 1,790 | ​ | $ | 1,790 | ​ | $ | 2,160 | ​ | $ | 2,160 | ​
Restricted cash and cash equivalents | ​ | ​ | 558 | ​ | ​ | 558 | ​ | ​ | 429 | ​ | ​ | 429 | ​
Restricted investments | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 123 | ​ | ​ | 123 | ​
Long-term debt, including current maturities | ​ | ​ | 9,261 | ​ | ​ | 8,976 | ​ | ​ | 9,978 | ​ | ​ | 9,212 | ​
Derivative instruments, assets | ​ | ​ | 1 | ​ | ​ | 1 | ​ | ​ | — | ​ | ​ | — | ​
Derivative instruments, liabilities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 6 | ​ | ​ | 6 | ​

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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