v3.25.4
FINANCING AND FINANCIAL INSTRUMENTS - Risk management policy - Effect of Hedge Accounting, Cash Flow Hedges (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about hedging instruments [line items]      
Total current derivative assets (note 4.5) $ 193 $ 305  
Total non-current derivative assets (note 4.6) 105 133  
Total current derivative liabilities (note 4.8) (223) (327)  
Total non-current derivative liabilities (note 9.2) (228) (343)  
Cash flow hedges      
Disclosure of detailed information about hedging instruments [line items]      
Assets carrying amount 118 163  
Liabilities carrying amount (136) (296)  
Total current derivative assets (note 4.5) 63 59  
Total non-current derivative assets (note 4.6) 55 104  
Total current derivative liabilities (note 4.8) (84) (85)  
Total non-current derivative liabilities (note 9.2) (52) (211)  
Cash Flow Hedge Reserve Rollforward:      
Cash flow hedge reserve at beginning of period 956 1,561  
Hedging gains or losses of the reporting period that were recognized in OCI 104 (311)  
Gains or losses reclassification adjustment and hedge ineffectiveness (9) 62  
Basis adjustment (92) (356)  
Cash flow hedge reserve at end of period 959 956  
Reserve of cash flow hedges 959 956  
Cash flow hedges | Derivative contract, equity method investments      
Cash Flow Hedge Reserve Rollforward:      
Reserve of cash flow hedges 185 365 $ 417
Cash flow hedges | Foreign exchange contracts      
Cash Flow Hedge Reserve Rollforward:      
Reserve of cash flow hedges (57) (184)  
Cash flow hedges | Commodities      
Cash Flow Hedge Reserve Rollforward:      
Reserve of cash flow hedges 63 296  
Cash flow hedges | Emission rights      
Cash Flow Hedge Reserve Rollforward:      
Reserve of cash flow hedges 953 844  
Other Hedges      
Disclosure of detailed information about hedging instruments [line items]      
Total current derivative assets (note 4.5) 130 246  
Total non-current derivative assets (note 4.6) 50 29  
Total current derivative liabilities (note 4.8) (139) (242)  
Total non-current derivative liabilities (note 9.2) (176) (132)  
Currency risk | Cash flow hedges | Foreign exchange contracts      
Cash Flow Hedge Reserve Rollforward:      
Cash flow hedge reserve at beginning of period (184) 28  
Hedging gains or losses of the reporting period that were recognized in OCI 64 (152)  
Gains or losses reclassification adjustment and hedge ineffectiveness (25) (18)  
Basis adjustment 88 (42)  
Cash flow hedge reserve at end of period (57) (184)  
Commodity price risk | Cash flow hedges | Commodities      
Cash Flow Hedge Reserve Rollforward:      
Cash flow hedge reserve at beginning of period 296 633  
Hedging gains or losses of the reporting period that were recognized in OCI (71) (105)  
Gains or losses reclassification adjustment and hedge ineffectiveness 18 82  
Basis adjustment (180) (314)  
Cash flow hedge reserve at end of period 63 296  
Commodity price risk | Cash flow hedges | Emission rights      
Cash Flow Hedge Reserve Rollforward:      
Cash flow hedge reserve at beginning of period 844 900  
Hedging gains or losses of the reporting period that were recognized in OCI 111 (54)  
Gains or losses reclassification adjustment and hedge ineffectiveness (2) (2)  
Basis adjustment 0 0  
Cash flow hedge reserve at end of period $ 953 $ 844  
Prepaid expenses and other current assets/Accrued expenses and other liabilities | Currency risk | Cash flow hedges | Foreign exchange contracts      
Disclosure of detailed information about hedging instruments [line items]      
Nominal amount of the hedging instrument 3,048 1,472  
Assets carrying amount $ 31 $ 9  
Liabilities carrying amount $ (16) $ (54)  
Prepaid expenses and other current assets/Accrued expenses and other liabilities | Commodity price risk | Cash flow hedges | Commodities      
Disclosure of detailed information about hedging instruments [line items]      
Nominal amount of the hedging instrument 362 354  
Assets carrying amount $ 32 $ 50  
Liabilities carrying amount $ (68) $ (31)  
Prepaid expenses and other current assets/Accrued expenses and other liabilities | Commodity price risk | Cash flow hedges | Emission rights      
Disclosure of detailed information about hedging instruments [line items]      
Nominal amount of the hedging instrument 0 0  
Assets carrying amount $ 0 $ 0  
Liabilities carrying amount $ 0 $ 0  
Other assets/Other long-term obligations | Currency risk | Cash flow hedges | Foreign exchange contracts      
Disclosure of detailed information about hedging instruments [line items]      
Nominal amount of the hedging instrument 663 1,326  
Assets carrying amount $ 22 $ 43  
Liabilities carrying amount $ (38) $ (192)  
Other assets/Other long-term obligations | Commodity price risk | Cash flow hedges | Commodities      
Disclosure of detailed information about hedging instruments [line items]      
Nominal amount of the hedging instrument 489 254  
Assets carrying amount $ 33 $ 61  
Liabilities carrying amount $ (14) $ (19)