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v3.20.4

Segment information - Results by Segment (Details) $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Jul. 01, 2018 USD ($) | Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting [Abstract] |  |  |  |  |
Number of reportable segments | segment |  |  | 3 |  |
Number of operating segments | segment |  |  | 3 |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 541 | $ 712 | $ 1,059 | $ 1,388 |
Depreciation | 236 | 391 | 346 | 426 |
Amortization of intangibles | 58 | 0 | 1 | 134 |
Impairment of drilling units and intangible assets | 0 | 414 | 4,108 | 0 |
Operating Income - net income [Abstract] |  |  |  |  |
Operating profit/(loss) | (175) | (613) | (4,482) | (295) |
Unallocated items: |  |  |  |  |
Total financial items and other | (422) | (3,242) | (176) | (966) |
Loss before income taxes | (597) | (3,855) | (4,658) | (1,261) |
Drilling units |  |  | 2,120 | 6,401 |
Investment in associated companies |  |  | 248 | 389 |
Marketable securities |  |  | 8 | 11 |
Cash and restricted cash | 2,003 | 2,177 | 723 | 1,357 | $ 1,359
Other assets |  |  | 862 | 1,121 |
Total assets |  |  | 3,961 | 9,279 |
Capital expenditures | 98 | 116 | 148 | 162 |
Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 11 | 5 | 18 | 24 |
Depreciation | 15 | 20 | 29 | 29 |
Impairment of drilling units and intangible assets | 0 | 0 | 48 | 0 |
Operating Income - net income [Abstract] |  |  |  |  |
Operating profit/(loss) | (4) | (20) | (218) | (23) |
Harsh environment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Amortization of intangibles | (13) | 0 | 1 | 0 |
Unallocated items: |  |  |  |  |
Drilling units |  |  | 1,032 | 1,537 |
Capital expenditures | 7 | 41 | 26 | 34 |
Harsh environment | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 150 | 103 | 526 | 510 |
Depreciation | 78 | 134 | 93 | 125 |
Impairment of drilling units and intangible assets | 0 | 414 | 419 | 0 |
Operating Income - net income [Abstract] |  |  |  |  |
Operating profit/(loss) | (59) | (562) | (396) | (69) |
Floaters |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Amortization of intangibles | 50 | 0 | 0 | 105 |
Unallocated items: |  |  |  |  |
Drilling units |  |  | 528 | 4,184 |
Capital expenditures | 72 | 69 | 110 | 111 |
Floaters | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 273 | 476 | 358 | 625 |
Depreciation | 120 | 179 | 176 | 224 |
Impairment of drilling units and intangible assets | 0 | 0 | 3,555 | 0 |
Operating Income - net income [Abstract] |  |  |  |  |
Operating profit/(loss) | (112) | 42 | (3,781) | (201) |
Jack-up rigs |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Amortization of intangibles | 21 | 0 | 0 | 29 |
Unallocated items: |  |  |  |  |
Drilling units |  |  | 560 | 680 |
Capital expenditures | 19 | 6 | 12 | 17 |
Jack-up rigs | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 107 | 128 | 157 | 229 |
Depreciation | 23 | 58 | 48 | 48 |
Impairment of drilling units and intangible assets | 0 | 0 | 86 | 0 |
Operating Income - net income [Abstract] |  |  |  |  |
Operating profit/(loss) | $ 0 | $ (73) | $ (87) | $ (2) |

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