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SHORT-TERM AND LONG-TERM DEBT - Composition of long term debt (Details)
Jun. 21, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
CHF (SFr)
Jun. 30, 2019
EUR (€)
Mar. 11, 2019
USD ($)
Jan. 17, 2019
USD ($)
Jan. 17, 2019
EUR (€)
Dec. 31, 2018
USD ($)
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 9,720,000,000           $ 9,871,000,000
Less current portion of long-term debt   (520,000,000)           (1,130,000,000)
Long-term debt, net of current portion (note 8)   10,723,000,000           9,316,000,000
5.5 billion Revolving Credit Facility                
Disclosure of detailed information about borrowings [line items]                
Borrowings   0           0
Notional amount   5,500,000,000.0            
€750 million Unsecured Notes                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 0           858,000,000
Notional amount | €       € 750,000,000        
€750 million Unsecured Notes | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   3.00% 3.00% 3.00%        
500 Unsecured Notes                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 324,000,000           324,000,000
Notional amount   $ 500,000,000            
500 Unsecured Notes | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   5.13% 5.13% 5.13%        
CHF 225 million Unsecured Notes                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 230,000,000           228,000,000
Notional amount | SFr     SFr 225,000,000          
CHF 225 million Unsecured Notes | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   2.50% 2.50% 2.50%        
€600 million Unsecured Notes                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 681,000,000           685,000,000
Notional amount | €       € 600,000,000        
€600 million Unsecured Notes | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   2.88% 2.88% 2.88%        
1.0 billion Unsecured Bonds                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 624,000,000           623,000,000
Notional amount   $ 1,000,000,000.0            
1.0 billion Unsecured Bonds | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   5.25% 5.25% 5.25%        
1.5 billion Unsecured Notes                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 754,000,000           754,000,000
Notional amount   $ 1,500,000,000.0            
1.5 billion Unsecured Notes | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   5.50% 5.50% 5.50%        
€500 million Unsecured Notes                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 567,000,000           570,000,000
Notional amount | €       € 500,000,000        
€500 million Unsecured Notes | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   3.00% 3.00% 3.00%        
€750 million Unsecured Notes                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 851,000,000           856,000,000
Notional amount | €       € 750,000,000        
€750 million Unsecured Notes | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   3.13% 3.13% 3.13%        
1.1 billion Unsecured Notes                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 656,000,000           656,000,000
Notional amount   $ 1,100,000,000.0            
1.1 billion Unsecured Notes | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   6.25% 6.25% 6.25%        
€500 million Unsecured Notes                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 565,000,000           568,000,000
Notional amount | €       € 500,000,000        
€500 million Unsecured Notes | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   0.95% 0.95% 0.95%        
€750 million unsecured notes                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate           2.25% 2.25%  
Borrowings   $ 848,000,000           0
Notional amount   $ 750,000,000       $ 854,000,000 € 750,000,000  
€750 million unsecured notes | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   2.25% 2.25% 2.25%        
500 Unsecured Notes                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 498,000,000           497,000,000
Notional amount   $ 500,000,000            
500 Unsecured Notes | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   6.13% 6.13% 6.13%        
750 Unsecured Notes                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate         4.55%      
Borrowings   $ 744,000,000           0
Notional amount   $ 750,000,000     $ 750,000,000      
750 Unsecured Notes | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   4.55% 4.55% 4.55%        
1.5 billion Unsecured Bonds                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 671,000,000           670,000,000
Notional amount   $ 1,500,000,000.0            
1.5 billion Unsecured Bonds | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   7.00% 7.00% 7.00%        
1.0 billion Unsecured Notes                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 428,000,000           428,000,000
Notional amount   $ 1,000,000,000.0            
1.0 billion Unsecured Notes | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   6.75% 6.75% 6.75%        
Other loans                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 198,000,000           114,000,000
Other loans | Fixed interest rate | Bottom of range                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   1.25% 1.25% 1.25%        
Other loans | Fixed interest rate | Top of range                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   3.46% 3.46% 3.46%        
EIB loan                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 382,000,000   € 335,000,000       401,000,000
EIB loan | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   1.16% 1.16% 1.16%        
7.0 billion Essar Acquisition Bridge Facility                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 0           1,000,000,000
Notional amount   $ 7,000,000,000.0            
7.0 billion Essar Acquisition Bridge Facility | Floating interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   3.31% 3.31% 3.31%        
Other loans                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 699,000,000           639,000,000
Other loans | Floating interest rate | Bottom of range                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   0.00% 0.00% 0.00%        
Other loans | Floating interest rate | Top of range                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   4.35% 4.35% 4.35%        
EBRD facility                
Disclosure of detailed information about borrowings [line items]                
Borrowings, Draw-down $ 125,000,000              
Long term borrowings including current portion                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 10,065,000,000           10,091,000,000
Total long-term debt (excluding lease obligations)                
Disclosure of detailed information about borrowings [line items]                
Long-term debt, net of current portion (note 8)   9,545,000,000           8,961,000,000
Finance Lease Obligations                
Disclosure of detailed information about borrowings [line items]                
Less current portion of long-term debt   (316,000,000)           (69,000,000)
Long-term debt, net of current portion (note 8)   1,178,000,000           355,000,000
Americas                
Disclosure of detailed information about borrowings [line items]                
Borrowings   78,000,000           84,000,000
Americas | Other loans                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 78,000,000           84,000,000
Americas | Other loans | Fixed/Floating interest rates | Bottom of range                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   2.50% 2.50% 2.50%        
Americas | Other loans | Fixed/Floating interest rates | Top of range                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   10.00% 10.00% 10.00%        
Europe, Asia & Africa                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 267,000,000           136,000,000
Europe, Asia & Africa | EBRD facility                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 175,000,000           50,000,000
Europe, Asia & Africa | EBRD facility | Floating interest rate | Bottom of range                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   4.10% 4.10% 4.10%        
Europe, Asia & Africa | EBRD facility | Floating interest rate | Top of range                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   4.40% 4.40% 4.40%        
Europe, Asia & Africa | Other loans                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 92,000,000           $ 86,000,000
Europe, Asia & Africa | Other loans | Fixed/Floating interest rates | Bottom of range                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   0.00% 0.00% 0.00%        
Europe, Asia & Africa | Other loans | Fixed/Floating interest rates | Top of range                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate   5.76% 5.76% 5.76%        
ArcelorMittal Kryvyi Rih | EBRD facility                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 175,000,000