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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial instruments [Line Items]        
Cash and cash equivalents $ 95 $ 121 $ 83 $ 87
Short-term investments and deposits 96 92    
Trade receivables 778 990    
Other receivables 403 295    
Financial assets available for sale 111 145    
Other non-current assets 286 387    
Short-term credit (420) (610)    
Trade payables (712) (715)    
Other current liabilities (587) (647)    
Long-term debt and debentures (2,181) (1,815)    
Other non-current liabilities (52) (10)    
Financial assets measured at fair value through the statement of income [Member]        
Disclosure of financial instruments [Line Items]        
Cash and cash equivalents 0 0    
Short-term investments and deposits 0 0    
Trade receivables 0 0    
Other receivables 11 13    
Financial assets available for sale 0 0    
Other non-current assets 57 15    
Total financial assets 68 28    
Short-term credit 0 0    
Trade payables 0 0    
Other current liabilities 0 0    
Long-term debt and debentures 0 0    
Other non-current liabilities 0 0    
Total financial liabilities 0 0    
Total financial instruments, net 68 28    
Measured at fair value through the statement of comprehensive income [Member]        
Disclosure of financial instruments [Line Items]        
Cash and cash equivalents 0 0    
Short-term investments and deposits 0 0    
Trade receivables 0 0    
Other receivables 40 0    
Financial assets available for sale 111 145    
Other non-current assets 0 0    
Total financial assets 151 145    
Short-term credit 0 0    
Trade payables 0 0    
Other current liabilities 0 0    
Long-term debt and debentures 0 0    
Other non-current liabilities 0 0    
Total financial liabilities 0 0    
Total financial instruments, net 151 145    
Measured at amortized cost [Member]        
Disclosure of financial instruments [Line Items]        
Cash and cash equivalents 95 121    
Short-term investments and deposits 96 92    
Trade receivables 778 990    
Other receivables 105 30    
Financial assets available for sale 0 0    
Other non-current assets 6 66    
Total financial assets 1,080 1,299    
Short-term credit 0 0    
Trade payables 0 0    
Other current liabilities 0 0    
Long-term debt and debentures 0 0    
Other non-current liabilities 0 0    
Total financial liabilities 0 0    
Total financial instruments, net 1,080 1,299    
Financial liabilities measured at fair value through the statement of income [Member]        
Disclosure of financial instruments [Line Items]        
Cash and cash equivalents 0 0    
Short-term investments and deposits 0 0    
Trade receivables 0 0    
Other receivables 0 0    
Financial assets available for sale 0 0    
Other non-current assets 0 0    
Total financial assets 0 0    
Short-term credit 0 0    
Trade payables 0 0    
Other current liabilities (8) (21)    
Long-term debt and debentures 0 0    
Other non-current liabilities (6) 0    
Total financial liabilities (14) (21)    
Total financial instruments, net (14) (21)    
Measured at amortized cost [Member]        
Disclosure of financial instruments [Line Items]        
Cash and cash equivalents 0 0    
Short-term investments and deposits 0 0    
Trade receivables 0 0    
Other receivables 0 0    
Financial assets available for sale 0 0    
Other non-current assets 0 0    
Total financial assets 0 0    
Short-term credit (420) (610)    
Trade payables (712) (715)    
Other current liabilities (128) (131)    
Long-term debt and debentures (2,181) (1,815)    
Other non-current liabilities (38) (6)    
Total financial liabilities (3,479) (3,277)    
Total financial instruments, net $ (3,479) $ (3,277)