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Financial Instruments and Risk Management (Groups and Measurement Bases of Financial Assets and Financial Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of financial instruments [Line Items]        
Cash and cash equivalents $ 83 $ 87 $ 161 $ 138
Short-term investments and deposits 90 29    
Trade receivables 932 966    
Other receivables 225 222    
Financial assets available for sale 212 253    
Other non-current assets 373 292    
Short-term credit (822) (588)    
Trade payables (790) (644)    
Other current liabilities (595) (708)    
Long-term debt and debentures (2,388) (2,796)    
Other non-current liabilities (7) $ (10)    
Financial assets measured at fair value through the statement of income [Member]        
Disclosure of financial instruments [Line Items]        
Cash and cash equivalents 0      
Short-term investments and deposits 0      
Trade receivables 0      
Other receivables 5      
Financial assets available for sale 0      
Other non-current assets 64      
Total financial assets 69      
Short-term credit 0      
Trade payables 0      
Other current liabilities 0      
Long-term debt and debentures 0      
Other non-current liabilities 0      
Total financial liabilities 0      
Total financial instruments, net 69      
Measured at fair value through the statement of comprehensive income [Member]        
Disclosure of financial instruments [Line Items]        
Cash and cash equivalents 0      
Short-term investments and deposits 0      
Trade receivables 0      
Other receivables 0      
Financial assets available for sale 212      
Other non-current assets 0      
Total financial assets 212      
Short-term credit 0      
Trade payables 0      
Other current liabilities 0      
Long-term debt and debentures 0      
Other non-current liabilities 0      
Total financial liabilities 0      
Total financial instruments, net 212      
Loans and receivables [Member]        
Disclosure of financial instruments [Line Items]        
Cash and cash equivalents 83      
Short-term investments and deposits 90      
Trade receivables 932      
Other receivables 81      
Financial assets available for sale 0      
Other non-current assets 8      
Total financial assets 1,194      
Short-term credit 0      
Trade payables 0      
Other current liabilities 0      
Long-term debt and debentures 0      
Other non-current liabilities 0      
Total financial liabilities 0      
Total financial instruments, net 1,194      
Financial liabilities measured at fair value through the statement of income [Member]        
Disclosure of financial instruments [Line Items]        
Cash and cash equivalents 0      
Short-term investments and deposits 0      
Trade receivables 0      
Other receivables 0      
Financial assets available for sale 0      
Other non-current assets 0      
Total financial assets 0      
Short-term credit 0      
Trade payables 0      
Other current liabilities (3)      
Long-term debt and debentures 0      
Other non-current liabilities (3)      
Total financial liabilities (6)      
Total financial instruments, net (6)      
Measured at amortized cost [Member]        
Disclosure of financial instruments [Line Items]        
Cash and cash equivalents 0      
Short-term investments and deposits 0      
Trade receivables 0      
Other receivables 0      
Financial assets available for sale 0      
Other non-current assets 0      
Total financial assets 0      
Short-term credit (822)      
Trade payables (790)      
Other current liabilities (310)      
Long-term debt and debentures (2,388)      
Other non-current liabilities 0      
Total financial liabilities (4,310)      
Total financial instruments, net $ (4,310)