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Financial Instruments and Risk Management (Liquidity Risk) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Short term debt (not including current maturities) $ 679 $ 420
Trade payables 740 712
Other payables 704 587
Long-term debt, debentures and others 2,053 2,181
Not past due [Member] | Non-derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Short term debt (not including current maturities) 296 358
Trade payables 740 712
Other payables 156 128
Long-term debt, debentures and others 2,489 2,281
Non-derivatives financial liabilities 3,681 3,479
Not past due [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 84 14
Not past due [Member] | Foreign currency and interest derivative designated as economic hedge [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities   11
Not past due [Member] | Foreign currency and interest derivative designated as economic hedge [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 55  
Not past due [Member] | Energy and marine transport derivative designated as economic hedge [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 1 3
Not past due [Member] | Foreign currency and interest derivative designated as cash flow hedge [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 28  
12 months or less [Member] | Non-derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Short term debt (not including current maturities) 299 361
Trade payables 740 712
Other payables 156 128
Long-term debt, debentures and others 489 157
Non-derivatives financial liabilities 1,684 1,358
12 months or less [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 43 8
12 months or less [Member] | Foreign currency and interest derivative designated as economic hedge [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities   5
12 months or less [Member] | Foreign currency and interest derivative designated as economic hedge [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 42  
12 months or less [Member] | Energy and marine transport derivative designated as economic hedge [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 1 3
12 months or less [Member] | Foreign currency and interest derivative designated as cash flow hedge [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 0  
Second year [Member] | Non-derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Short term debt (not including current maturities) 0 0
Trade payables 0 0
Other payables 0 0
Long-term debt, debentures and others 529 645
Non-derivatives financial liabilities 529 645
Second year [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 0 0
Second year [Member] | Foreign currency and interest derivative designated as economic hedge [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities   0
Second year [Member] | Foreign currency and interest derivative designated as economic hedge [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 0  
Second year [Member] | Energy and marine transport derivative designated as economic hedge [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 0 0
Second year [Member] | Foreign currency and interest derivative designated as cash flow hedge [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 0  
3-5 years [Member] | Non-derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Short term debt (not including current maturities) 0 0
Trade payables 0 0
Other payables 0 0
Long-term debt, debentures and others 859 1,101
Non-derivatives financial liabilities 859 1,101
3-5 years [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 0 0
3-5 years [Member] | Foreign currency and interest derivative designated as economic hedge [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities   0
3-5 years [Member] | Foreign currency and interest derivative designated as economic hedge [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 0  
3-5 years [Member] | Energy and marine transport derivative designated as economic hedge [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 0 0
3-5 years [Member] | Foreign currency and interest derivative designated as cash flow hedge [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 0  
Sixth year and thereafter [Member] | Non-derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Short term debt (not including current maturities) 0 0
Trade payables 0 0
Other payables 0 0
Long-term debt, debentures and others 1,559 1,288
Non-derivatives financial liabilities 1,559 1,288
Sixth year and thereafter [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 41 6
Sixth year and thereafter [Member] | Foreign currency and interest derivative designated as economic hedge [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities   6
Sixth year and thereafter [Member] | Foreign currency and interest derivative designated as economic hedge [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 13  
Sixth year and thereafter [Member] | Energy and marine transport derivative designated as economic hedge [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 0 $ 0
Sixth year and thereafter [Member] | Foreign currency and interest derivative designated as cash flow hedge [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities $ 28