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Financial Instruments and Risk Management (Liquidity Risk) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Short-term credit $ 822 $ 588
Trade payables 790 644
Other current liabilities 595 708
Long-term debt and debentures 2,388 2,796
Not past due [Member] | Non-derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Short-term credit 810 572
Trade payables 790 644
Other current liabilities 310 334
Long-term debt and debentures 2,400 2,812
Non-derivatives financial liabilities 4,310 4,362
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 6 8
12 months or less [Member] | Non-derivative instruments [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Short-term credit 822 576
Trade payables 790 644
Other current liabilities 310 334
Long-term debt and debentures 102 113
Non-derivatives financial liabilities 2,024 1,667
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 3 3
Second year [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Long-term debt and debentures 261 16
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 345 111
Non-derivatives financial liabilities 345 111
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
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 1,085 1,641
Non-derivatives financial liabilities 1,085 1,641
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 1
Third year [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Long-term debt and debentures 18 323
Fourth year [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Long-term debt and debentures 213 27
Fifth year [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Long-term debt and debentures 644 1,046
Sixth year and thereafter [Member]    
Disclosure of risk management strategy related to hedge accounting [Line Items]    
Long-term debt and debentures 1,252 1,384
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 1,358 1,556
Non-derivatives financial liabilities 1,358 1,556
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 $ 3 $ 4