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PROVISIONS - Provisions overview (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Disclosure of other provisions [line items]    
Total $ 2,256 $ 2,562
Short-term provisions 722 1,064
Long-term provisions 1,534 1,498
Environmental    
Disclosure of other provisions [line items]    
Total 557 595
Emission rights    
Disclosure of other provisions [line items]    
Total 322 492
Asset retirement obligations    
Disclosure of other provisions [line items]    
Total 399 397
Site restoration    
Disclosure of other provisions [line items]    
Total 183 220
Staff related obligations    
Disclosure of other provisions [line items]    
Total 128 120
Voluntary separation plans    
Disclosure of other provisions [line items]    
Total 22 31
Litigation and contingencies (see note 12)    
Disclosure of other provisions [line items]    
Total 280 323
Tax claims    
Disclosure of other provisions [line items]    
Total 80 79
Other legal claims and contingencies    
Disclosure of other provisions [line items]    
Total 200 244
Commercial agreements and onerous contracts    
Disclosure of other provisions [line items]    
Total 28 23
Other    
Disclosure of other provisions [line items]    
Total $ 337 $ 361