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Schedule of cash flows reconciliation (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Net Cash Used In Financing Activities [Member]    
IfrsStatementLineItems [Line Items]    
Addition for new fund obligation $ 330 $ 1,668
Amortization expense benefit (5,477) (13,558)
Amortisation of capitalised interests (916) (1,227)
Finance debt [member]    
IfrsStatementLineItems [Line Items]    
Addition for new fund obligation 330 1,668
Amortization expense benefit (5,363) (12,684)
Amortisation of capitalised interests (915) (1,264)
Finance debt [member] | Movement In Financing [Member]    
IfrsStatementLineItems [Line Items]    
Addition for new fund obligation 330 1,668
Amortization expense benefit (5,363) (12,684)
Amortisation of capitalised interests (915) (1,264)
Finance debt [member] | Repurchase Of Debt Securities [Member]    
IfrsStatementLineItems [Line Items]    
Amortization expense benefit (110) (848)
Finance debt [member] | Deposits financing [member]    
IfrsStatementLineItems [Line Items]    
Amortization expense benefit [1] (4) (26)
Amortisation of capitalised interests [1] $ (1) $ 37
[1] Deposits linked to financing with China Development Bank (CDB), with semiannual settlements in June and December.