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Equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Equipment Equipment
Equipment consists of office equipment, software, furniture and fittings. Changes in equipment balances for the periods presented in this report were as follows:
 (In $ millions)
CostAccumulated depreciationNet book value
January 1, 202038 (15)23 
Additions1 — 1 
Depreciation— (5)(5)
December 31, 202039 (20)19 
Depreciation— (8)(8)
December 31, 202139 (28)11