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FINANCIAL INSTRUMENTS - Level 2 financial instruments (Details) - Level 2 - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Disclosure of fair value measurement of assets [line items]    
Derivative financial assets, fair value $ 5,129 $ 3,288
Derivative financial liabilities, fair value (742) (374)
Total foreign exchange rate instruments    
Disclosure of fair value measurement of assets [line items]    
Derivative financial assets, fair value 434 156
Derivative financial liabilities, fair value (127) (67)
Forward purchase of contracts    
Disclosure of fair value measurement of assets [line items]    
Derivative financial assets, notional amount 7,787 3,845
Derivative financial assets, fair value 358 133
Derivative liability, notional amount 1,322 1,023
Derivative financial liabilities, fair value (30) (43)
Forward sale of contracts    
Disclosure of fair value measurement of assets [line items]    
Derivative financial assets, notional amount 1,281 2,685
Derivative financial assets, fair value 33 16
Derivative liability, notional amount 632 1,431
Derivative financial liabilities, fair value (91) (15)
Exchange option purchases    
Disclosure of fair value measurement of assets [line items]    
Derivative financial assets, notional amount 1,120 712
Derivative financial assets, fair value 12 2
Derivative liability, notional amount 213 254
Derivative financial liabilities, fair value (2) (7)
Exchange options sales    
Disclosure of fair value measurement of assets [line items]    
Derivative financial assets, notional amount 900 338
Derivative financial assets, fair value 31 5
Derivative liability, notional amount 394 707
Derivative financial liabilities, fair value (4) (2)
Total raw materials (base metal), freight, energy, emission rights and others    
Disclosure of fair value measurement of assets [line items]    
Derivative financial assets, fair value 4,695 3,132
Derivative financial liabilities, fair value (615) (307)
Term contracts sales    
Disclosure of fair value measurement of assets [line items]    
Derivative financial assets, notional amount 514 121
Derivative financial assets, fair value 66 1
Derivative liability, notional amount 1,400 644
Derivative financial liabilities, fair value (411) (259)
Term contracts purchases    
Disclosure of fair value measurement of assets [line items]    
Derivative financial assets, notional amount 3,493 3,461
Derivative financial assets, fair value 4,627 3,131
Derivative liability, notional amount 928 497
Derivative financial liabilities, fair value (203) $ (48)
Options sales/purchases    
Disclosure of fair value measurement of assets [line items]    
Derivative financial assets, notional amount 10  
Derivative financial assets, fair value 2  
Derivative liability, notional amount 73  
Derivative financial liabilities, fair value $ (1)