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Significant accounting policies, judgements, estimates and assumptions - Summary of new accounting standard impact on net assets (Details)
$ in Millions
Jan. 01, 2018
USD ($)
Disclosure of expected impact of initial application of new standards or interpretations [line items]  
Net assets, beginning of period $ 100,404
IFRS 9 Financial Instruments  
Disclosure of expected impact of initial application of new standards or interpretations [line items]  
Net assets, beginning of period 100,404
Adjustment on adoption of IFRS 9 net of tax and including the group's share of equity-accounted entities (180)
Net assets, end of period $ 100,224