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Revenues (Tables) | 9 Months Ended
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Sep. 30, 2018
Revenues |
Schedule of revenue disaggregation | In the three and nine months ended September 30, 2018 and 2017, we recognized revenues as follows (in millions):
|  | Three months ended September 30, 2018 |  |  | Three months ended September 30, 2017 |
|  | U.S. |  | U.K. |  | Norway |  | Brazil |  | Other |  | Total |  |  | U.S. |  | U.K. |  | Norway |  | Brazil |  | Other |  | Total |
Ultra-deepwater floaters |  | $ | 396 |  | $ | — |  | $ | — |  | $ | 1 |  | $ | 86 |  | $ | 483 |  |  | $ | 368 |  | $ | — |  | $ | — |  | $ | 39 |  | $ | 116 |  | $ | 523 |
Harsh environment floaters |  |  | — |  |  | 37 |  |  | 174 |  |  | — |  |  | 54 |  |  | 265 |  |  |  | 8 |  |  | 62 |  |  | 15 |  |  | — |  |  | 33 |  |  | 118 |
Deepwater floaters |  |  | — |  |  | — |  |  | — |  |  | 25 |  |  | 11 |  |  | 36 |  |  |  | — |  |  | — |  |  | — |  |  | 24 |  |  | 11 |  |  | 35 |
Midwater floaters |  |  | — |  |  | 10 |  |  | — |  |  | — |  |  | 9 |  |  | 19 |  |  |  | — |  |  | 8 |  |  | — |  |  | — |  |  | 96 |  |  | 104 |
High-specification jackups |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 13 |  |  | 13 |  |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 28 |  |  | 28 |
Total revenues |  | $ | 396 |  | $ | 47 |  | $ | 174 |  | $ | 26 |  | $ | 173 |  | $ | 816 |  |  | $ | 376 |  | $ | 70 |  | $ | 15 |  | $ | 63 |  | $ | 284 |  | $ | 808 |
|  | Nine months ended September 30, 2018 |  |  | Nine months ended September 30, 2017 |
|  | U.S. |  | U.K. |  | Norway |  | Brazil |  | Other |  | Total |  |  | U.S. |  | U.K. |  | Norway |  | Brazil |  | Other |  | Total |
Ultra-deepwater floaters |  | $ | 1,162 |  | $ | — |  | $ | — |  | $ | 1 |  | $ | 168 |  | $ | 1,331 |  |  | $ | 1,167 |  | $ | — |  | $ | — |  | $ | 198 |  | $ | 244 |  | $ | 1,609 |
Harsh environment floaters |  |  | — |  |  | 88 |  |  | 467 |  |  | — |  |  | 166 |  |  | 721 |  |  |  | 8 |  |  | 197 |  |  | 54 |  |  | — |  |  | 89 |  |  | 348 |
Deepwater floaters |  |  | — |  |  | — |  |  | — |  |  | 74 |  |  | 32 |  |  | 106 |  |  |  | — |  |  | — |  |  | — |  |  | 73 |  |  | 33 |  |  | 106 |
Midwater floaters |  |  | — |  |  | 30 |  |  | — |  |  | — |  |  | 27 |  |  | 57 |  |  |  | — |  |  | 22 |  |  | — |  |  | — |  |  | 114 |  |  | 136 |
High-specification jackups |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 55 |  |  | 55 |  |  |  | — |  |  | 33 |  |  | — |  |  | — |  |  | 112 |  |  | 145 |
Total revenues |  | $ | 1,162 |  | $ | 118 |  | $ | 467 |  | $ | 75 |  | $ | 448 |  | $ | 2,270 |  |  | $ | 1,175 |  | $ | 252 |  | $ | 54 |  | $ | 271 |  | $ | 592 |  | $ | 2,344 |
Schedule of contract balances and changes | Contract liabilities for our contracts with customers were as follows (in millions):
|  | September 30, |  | January 1, |
|  | 2018 |  | 2018 |
Deferred contract revenues, recorded in other current liabilities |  | $ | 90 |  | $ | 203 |
Deferred contract revenues, recorded in other long-term liabilities |  |  | 408 |  |  | 422 |
Total contract liabilities |  | $ | 498 |  | $ | 625 |
Significant changes in contract liabilities were as follows (in millions):
|  | Nine months |
|  | ended |
|  | September 30, 2018 |
Total contract liabilities, beginning of period |  |  | 625 |
Decrease due to recognition of revenues for goods and services |  |  | (192) |
Increase due to goods and services transferred over time |  |  | 65 |
Total contract liabilities, end of period |  | $ | 498 |

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