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Financial Instruments and Risk Management (Liquidity Risk) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Short-term credit $ 610 $ 822
Trade payables 715 790
Other current liabilities 647 595
Long-term debt and debentures 1,815 2,388
Not past due [Member] | Non-derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Short-term credit 544 810
Trade payables 715 790
Other current liabilities 330 310
Long-term debt and debentures 1,881 2,400
Non-derivatives financial liabilities 3,470 4,310
Not past due [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 21  
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 16 6
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 5  
12 months or less [Member] | Non-derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Short-term credit 556 822
Trade payables 715 790
Other current liabilities 330 310
Long-term debt and debentures 152 102
Non-derivatives financial liabilities 1,753 2,024
12 months or less [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 20  
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 16 3
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 4  
Second year [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Long-term debt and debentures 17 261
Second year [Member] | Non-derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Short-term credit 0 0
Trade payables 0 0
Other current liabilities 0 0
Long-term debt and debentures 453 345
Non-derivatives financial liabilities 453 345
Second year [Member] | Derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Derivatives financial liabilities 1  
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 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 1  
3-5 years [Member] | Non-derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Short-term credit 0 0
Trade payables 0 0
Other current liabilities 0 0
Long-term debt and debentures 1,084 1,085
Non-derivatives financial liabilities 1,084 1,085
3-5 years [Member] | 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 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  
Third year [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Long-term debt and debentures 273 18
Fourth year [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Long-term debt and debentures 113 213
Fifth year [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Long-term debt and debentures 308 644
Sixth year and thereafter [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Long-term debt and debentures 1,104 1,252
Sixth year and thereafter [Member] | Non-derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Short-term credit 0 0
Trade payables 0 0
Other current liabilities 0 0
Long-term debt and debentures 1,166 1,358
Non-derivatives financial liabilities 1,166 1,358
Sixth year and thereafter [Member] | 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 0 $ 3
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