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Operating Segments, Geographic Analysis and Major Customers (Tables) | 12 Months Ended
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Dec. 31, 2019
Operating Segments, Geographic Analysis and Major Customers |
Schedule of operating revenues for continuing operations by country | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31, |
​ |  | 2019 |  | 2018 |  | 2017 |
Operating revenues | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. |  | $ | 1,264 | ​ | $ | 1,496 | ​ | $ | 1,527 | ​
Norway | ​ | ​ | 775 | ​ | ​ | 651 | ​ | ​ | 83 | ​
Brazil | ​ | ​ | 125 | ​ | ​ | 110 | ​ | ​ | 335 | ​
Other countries (a) | ​ | ​ | 924 | ​ | ​ | 761 | ​ | ​ | 1,028 | ​
Total operating revenues |  | $ | 3,088 | ​ | $ | 3,018 | ​ | $ | 2,973 | ​
| (a) | Other countries represents the aggregate value for countries in which we operate that individually had operating revenues representing less than 10 percent of consolidated operating revenues earned. |
Schedule of long-lived assets of the entity's continuing operations by country | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ |  | 2019 (a) |  | 2018 |
Long-lived assets | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. |  | $ | 6,259 | ​ | $ | 6,257 | ​
Norway | ​ | ​ | 3,203 | ​ | ​ | 3,260 | ​
Greece | ​ | ​ | 2,760 | ​ | ​ | 1,103 | ​
Other countries (b) | ​ | ​ | 7,194 | ​ | ​ | 9,788 | ​
Total long-lived assets |  | $ | 19,416 | ​ | $ | 20,408 | ​
| (a) | The aggregate carrying amount includes the combined total of our property and equipment and our right-of-use assets. |
| (b) | Other countries represents the aggregate value for countries in which we operate that individually had long-lived assets representing less than 10 percent of consolidated long-lived assets. |

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