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Finance debt (Details 3) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
IfrsStatementLineItems [Line Items]    
Proceeds from finance debt $ 62 $ 330
Repayment of principal [1] (1,445) (5,363)
Net Cash Used In Financing Activities [Member]    
IfrsStatementLineItems [Line Items]    
Proceeds from finance debt 62 330
Repayment of principal (1,482) (5,477)
Repayment of interest (1,004) (916)
Finance Debt [Member] | Changes In Finance Debt [Member]    
IfrsStatementLineItems [Line Items]    
Proceeds from finance debt 62 330
Repayment of principal (1,445) (5,363)
Repayment of interest (990) (915)
Finance Debt [Member] | Repurchase Of Debt Securities [Member]    
IfrsStatementLineItems [Line Items]    
Repayment of principal   (110)
Finance Debt [Member] | Deposits Financing [Member]    
IfrsStatementLineItems [Line Items]    
Repayment of principal [2] (37) (4)
Repayment of interest [2] $ (14) $ (1)
[1] It includes pre-payments.
[2] Deposits linked to finance debt with China Development Bank, with semiannual settlements in June and December.