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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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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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