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Schedule of financial leverage ratios (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Total borrowings $ 1,438 $ 1,614 $ 1,947 $ 2,177
Less: cash and cash equivalents, and financial assets at fair value through profit and loss (568) (466)    
Net debt 870 1,148    
Total capital attributable to owners $ 2,655 $ 2,576    
Leverage ratio 32.77% 44.57%