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Additional disclosure items G.2.1. Capital commitments (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Capital Commitments [Line Items]    
Capital commitments $ 761 $ 564
1 year    
Capital Commitments [Line Items]    
Capital commitments 428 400
Joint ventures    
Capital Commitments [Line Items]    
Capital commitments 41 69
Joint ventures | 1 year    
Capital Commitments [Line Items]    
Capital commitments $ 41 $ 52