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v3.21.2

Drilling units (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Cost |  |  |  |  |
Impairment of long-lived assets |  | $ (152) | $ (1,230) |  |
Drilling units |  |  |  |  |
Cost |  |  |  |  |
Opening balance | $ 7,048 | 3,108 | 7,048 |  |
Additions |  | 39 | 85 |  |
Impairment of long-lived assets | (1,230) | (152) | (1,230) |  |
Closing balance |  | 2,995 | 5,903 |  |
Accumulated depreciation |  |  |  |  |
Opening balance | $ (647) | (988) | (647) |  |
Depreciation |  | (80) | (179) |  |
Closing balance |  | (1,068) | (826) |  |
Net book value |  | $ 1,927 | $ 5,077 | $ 2,120 | $ 6,401

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