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Provisions for legal proceedings are set out as follows: (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
DisclosureProvisionsForLegalProceedingsLineItems [Line Items]        
Total $ 2,468 $ 2,018 $ 2,228 $ 2,199
Legal proceedings provision [member]        
DisclosureProvisionsForLegalProceedingsLineItems [Line Items]        
Total 771 716    
Provision for taxes other than income tax [member]        
DisclosureProvisionsForLegalProceedingsLineItems [Line Items]        
Total 385 306    
Civil provision [member]        
DisclosureProvisionsForLegalProceedingsLineItems [Line Items]        
Total 1,084 820    
Other environment related provision [member]        
DisclosureProvisionsForLegalProceedingsLineItems [Line Items]        
Total $ 228 $ 176