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Taxation - Deferred Income Taxes (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred Tax Assets [Abstract]    
Pensions and stock options $ 1 $ 2
Provisions 31 30
Net operating losses carried forward 251 259
Intangibles 4 0
Other 3 0
Gross deferred tax assets 290 291
Valuation allowance (219) (255)
Deferred tax assets, net of valuation allowance 71 36
Deferred Tax Liability [Abstract]    
Property, plant and equipment 30 30
Unremitted Earnings of Subsidiaries 8 10
Deferred gain 34 0
Intangibles 0 4
Gross deferred tax liabilities 72 44
Net deferred tax liability $ (1) $ (8)