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Financial Instruments and Risk Management (Liquidity Risk) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Short term credit (not including current maturities) $ 420 $ 610
Trade payables 712 715
Other current liabilities 587 647
Long-term debt, debentures and others 2,181 1,815
Not past due [Member] | Non-derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Short term credit (not including current maturities) 358 544
Trade payables 712 715
Other current liabilities 128 131
Long-term debt, debentures and others 2,281 1,887
Non-derivatives financial liabilities 3,479 3,277
Not past due [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 14 21
Not past due [Member] | Foreign currency and interest derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities   16
Not past due [Member] | Foreign currency and interest derivative instruments [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 11  
Not past due [Member] | Derivative instruments on energy and marine transport [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 3 5
12 months or less [Member] | Non-derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Short term credit (not including current maturities) 361 556
Trade payables 712 715
Other current liabilities 128 131
Long-term debt, debentures and others 157 152
Non-derivatives financial liabilities 1,358 1,554
12 months or less [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 8 20
12 months or less [Member] | Foreign currency and interest derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities   16
12 months or less [Member] | Foreign currency and interest derivative instruments [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 5  
12 months or less [Member] | Derivative instruments on energy and marine transport [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 3 4
Second year [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Long-term debt, debentures and others 368 17
Second year [Member] | Non-derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Short term credit (not including current maturities) 0 0
Trade payables 0 0
Other current liabilities 0 0
Long-term debt, debentures and others 645 453
Non-derivatives financial liabilities 645 453
Second year [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 0 1
Second year [Member] | Foreign currency and interest derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities   0
Second year [Member] | Foreign currency and interest derivative instruments [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 0  
Second year [Member] | Derivative instruments on energy and marine transport [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 0 1
3-5 years [Member] | Non-derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Short term credit (not including current maturities) 0 0
Trade payables 0 0
Other current liabilities 0 0
Long-term debt, debentures and others 1,101 1,084
Non-derivatives financial liabilities 1,101 1,084
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 instruments [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 instruments [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 0  
3-5 years [Member] | Derivative instruments on energy and marine transport [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 0 0
Third year [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Long-term debt, debentures and others 161 273
Fourth year [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Long-term debt, debentures and others 142 113
Fifth year [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Long-term debt, debentures and others 799 308
Sixth year and thereafter [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Long-term debt, debentures and others 711 1,104
Sixth year and thereafter [Member] | Non-derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Short term credit (not including current maturities) 0 0
Trade payables 0 0
Other current liabilities 0 0
Long-term debt, debentures and others 1,288 1,166
Non-derivatives financial liabilities 1,288 1,166
Sixth year and thereafter [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 6 0
Sixth year and thereafter [Member] | Foreign currency and interest derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities   0
Sixth year and thereafter [Member] | Foreign currency and interest derivative instruments [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 6  
Sixth year and thereafter [Member] | Derivative instruments on energy and marine transport [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities $ 0 $ 0