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v3.20.4

Equipment (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 01, 2018
Equipment |  |  |  |  |  |
Cost |  |  |  |  |  |
Opening balance | $ 38 | $ 34 |  |  |  |
Property, Plant and Equipment, Additions | 1 | 4 |  |  |  |
Closing balance | 39 | 38 |  |  |  |
Cost | 39 | 38 | $ 39 | $ 38 | $ 34 |
Accumulated depreciation |  |  |  |  |  |
Opening balance | (15) | (5) |  |  |  |
Depreciation | (5) | (10) |  |  |  |
Closing balance | (20) | (15) |  |  |  |
Accumulated depreciation | $ (20) | $ (15) | (20) | (15) | (5) |
Net book value |  |  | $ 19 | $ 23 | $ 29 |
Fresh Start Adjustments |  |  |  |  |  |
Accumulated depreciation |  |  |  |  |  |
Fresh Start adjustments, net |  |  |  |  |  | $ (6)

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