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Revenues (Tables) | 12 Months Ended
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Dec. 31, 2019
Revenues |
Schedule of revenue disaggregation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31, 2019 | ​
​ |  | U.S. |  | Norway |  | Brazil |  | Other |  | Total |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ultra-deepwater floaters | ​ | $ | 1,264 | ​ | $ | — | ​ | $ | 119 | ​ | $ | 574 | ​ | $ | 1,957 | ​
Harsh environment floaters | ​ | ​ | — | ​ | ​ | 775 | ​ | ​ | — | ​ | ​ | 294 | ​ | ​ | 1,069 | ​
Deepwater floaters | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 6 | ​ | ​ | 1 | ​ | ​ | 7 | ​
Midwater floaters | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 55 | ​ | ​ | 55 | ​
Total revenues | ​ | $ | 1,264 | ​ | $ | 775 | ​ | $ | 125 | ​ | $ | 924 | ​ | $ | 3,088 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31, 2018 | ​
​ |  | U.S. |  | Norway |  | Brazil |  | Other |  | Total |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ultra-deepwater floaters | ​ | $ | 1,496 | ​ | $ | — | ​ | $ | 26 | ​ | $ | 266 | ​ | $ | 1,788 | ​
Harsh environment floaters | ​ | ​ | — | ​ | ​ | 651 | ​ | ​ | — | ​ | ​ | 323 | ​ | ​ | 974 | ​
Deepwater floaters | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 84 | ​ | ​ | 40 | ​ | ​ | 124 | ​
Midwater floaters | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 74 | ​ | ​ | 74 | ​
High-specification jackups | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 58 | ​ | ​ | 58 | ​
Total revenues | ​ | $ | 1,496 | ​ | $ | 651 | ​ | $ | 110 | ​ | $ | 761 | ​ | $ | 3,018 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31, 2017 | ​
​ | ​ | U.S. |  | Norway |  | Brazil |  | Other |  | Total |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ultra-deepwater floaters | ​ | $ | 1,519 | ​ | $ | — | ​ | $ | 235 | ​ | $ | 294 | ​ | $ | 2,048 | ​
Harsh environment floaters | ​ | ​ | 8 | ​ | ​ | 83 | ​ | ​ | — | ​ | ​ | 365 | ​ | ​ | 456 | ​
Deepwater floaters | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 100 | ​ | ​ | 44 | ​ | ​ | 144 | ​
Midwater floaters | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 153 | ​ | ​ | 153 | ​
High-specification jackups | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 172 | ​ | ​ | 172 | ​
Total revenues | ​ | $ | 1,527 | ​ | $ | 83 | ​ | $ | 335 | ​ | $ | 1,028 | ​ | $ | 2,973 | ​
Schedule of contract balances and changes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​
​ |  | 2019 |  | 2018 |
Deferred contract revenues, recorded in other current liabilities |  | $ | 100 | ​ | $ | 87 | ​
Deferred contract revenues, recorded in other long-term liabilities | ​ | ​ | 429 | ​ | ​ | 399 | ​
Total contract liabilities |  | $ | 529 | ​ | $ | 486 | ​
Significant changes in contract liabilities were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31, | ​
​ |  | 2019 |  | 2018 |
Total contract liabilities, beginning of period | ​ | $ | 486 | ​ | $ | 625 | ​
Decrease due to recognition of revenues for goods and services | ​ | ​ | (114) | ​ | ​ | (239) | ​
Increase due to goods and services transferred over time | ​ | ​ | 157 | ​ | ​ | 100 | ​
Total contract liabilities, end of period | ​ | $ | 529 | ​ | $ | 486 | ​

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