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Additional disclosure items G.2.1. Capital commitments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Capital Commitments [Line Items]    
Capital commitments $ 564 $ 122
1 year    
Capital Commitments [Line Items]    
Capital commitments 400 102
Joint ventures    
Capital Commitments [Line Items]    
Capital commitments 69 52
Joint ventures | 1 year    
Capital Commitments [Line Items]    
Capital commitments $ 52 $ 51