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Trade, other payables and provisions (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of transactions between related parties [line items]    
Trade payables $ 2,748 $ 3,047
Non-trade payables and accrued expenses 2,352 2,405
Total financial trade and other payables 7,736 9,027
Current portion of provisions and other non-financial payables 2,774 1,423
Trade, other payables and provisions 10,510 10,450
Joint venture [member]    
Disclosure of transactions between related parties [line items]    
Related party payables 2,090 2,628
Equity accounted associated companies and other related parties    
Disclosure of transactions between related parties [line items]    
Related party payables $ 546 $ 947