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Revenues (Tables) | 3 Months Ended
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Mar. 31, 2020
Revenues |
Schedule of revenue disaggregation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended March 31, 2020 | ​ | ​ | Three months ended March 31, 2019 | ​
​ |  | U.S. |  | Norway |  | Brazil |  | Other |  | Total |  |  | U.S. |  | Norway |  | Brazil |  | Other |  | Total |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ultra-deepwater floaters |  | $ | 287 | ​ | $ | — | ​ | $ | 59 | ​ | $ | 182 | ​ | $ | 528 |  | ​ | $ | 314 | ​ | $ | — | ​ | $ | 26 | ​ | $ | 136 | ​ | $ | 476 | ​
Harsh environment floaters | ​ | ​ | — | ​ | ​ | 207 | ​ | ​ | — | ​ | ​ | 13 | ​ | ​ | 220 | ​ | ​ | ​ | — | ​ | ​ | 181 | ​ | ​ | — | ​ | ​ | 77 | ​ | ​ | 258 | ​
Deepwater floaters | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 6 | ​ | ​ | — | ​ | ​ | 6 | ​
Midwater floaters | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 11 | ​ | ​ | 11 | ​ | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 14 | ​ | ​ | 14 | ​
Total revenues |  | $ | 287 | ​ | $ | 207 | ​ | $ | 59 | ​ | $ | 206 | ​ | $ | 759 |  | ​ | $ | 314 | ​ | $ | 181 | ​ | $ | 32 | ​ | $ | 227 | ​ | $ | 754 | ​
​
Schedule of contract balances and changes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31, | ​
​ |  | 2020 |  | 2019 |
Deferred contract revenues, recorded in other current liabilities |  | $ | 113 | ​ | $ | 100 | ​
Deferred contract revenues, recorded in other long-term liabilities | ​ | ​ | 421 | ​ | ​ | 429 | ​
Total contract liabilities |  | $ | 534 | ​ | $ | 529 | ​
Significant changes in contract liabilities were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​
​ | ​ | March 31, | ​
​ |  | 2020 |  | 2019 |
Total contract liabilities, beginning of period | ​ | $ | 529 | ​ | $ | 486 | ​
Decrease due to recognition of revenues for goods and services | ​ | ​ | (41) | ​ | ​ | (37) | ​
Increase due to goods and services transferred over time | ​ | ​ | 46 | ​ | ​ | 38 | ​
Total contract liabilities, end of period | ​ | $ | 534 | ​ | $ | 487 | ​

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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