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FINANCIAL INSTRUMENTS - Level 2 financial instruments (Details) - Level 2 - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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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) |

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