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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of financial instruments [Line Items]        
Cash and cash equivalents $ 121 $ 83 $ 87 $ 161
Short-term investments and deposits 92 90    
Trade receivables 990 932    
Other receivables 295 225    
Investments at fair value through other comprehensive income 145 212    
Other non-current assets 357 373    
Short-term credit (610) (822)    
Trade payables (715) (790)    
Other current liabilities (647) (595)    
Long-term debt and debentures (1,815) (2,388)    
Other non-current liabilities (10) (7)    
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 13 5    
Investments at fair value through other comprehensive income 0 0    
Other non-current assets 15 64    
Total financial assets 28 69    
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 28 69    
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 0 0    
Investments at fair value through other comprehensive income 145 212    
Other non-current assets 0 0    
Total financial assets 145 212    
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 145 212    
Measured at amortized cost [Member]        
Disclosure of financial instruments [Line Items]        
Cash and cash equivalents 121 83    
Short-term investments and deposits 92 90    
Trade receivables 990 932    
Other receivables 30 81    
Investments at fair value through other comprehensive income 0 0    
Other non-current assets 66 9    
Total financial assets 1,299 1,195    
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 1,299 1,195    
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    
Investments at fair value through other comprehensive income 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 (21) (3)    
Long-term debt and debentures 0 0    
Other non-current liabilities 0 (3)    
Total financial liabilities (21) (6)    
Total financial instruments, net (21) (6)    
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    
Investments at fair value through other comprehensive income 0 0    
Other non-current assets 0 0    
Total financial assets 0 0    
Short-term credit (610) (822)    
Trade payables (715) (790)    
Other current liabilities (330) (311)    
Long-term debt and debentures (1,815) (2,388)    
Other non-current liabilities (6) (1)    
Total financial liabilities (3,476) (4,312)    
Total financial instruments, net $ (3,476) $ (4,312)