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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial instruments [Line Items]        
Cash and cash equivalents $ 214 $ 95 $ 121 $ 83
Short-term investments and deposits 100 96    
Trade receivables 883 778    
Other receivables 394 403    
Investments at fair value through other comprehensive income 83 111    
Other non-current assets 393 286    
Short-term debt (679) (420)    
Trade payables (740) (712)    
Other payables (704) (587)    
Long-term debt and debentures (2,053) (2,181)    
Other non-current liabilities (98) (52)    
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 0 0    
Investments at fair value through other comprehensive income 0 0    
Foreign currency and interest derivative designated as economic hedge Current Assets 24 10    
Energy and marine transport derivative designated as economic hedge Current Assets   1    
Foreign currency and interest derivative designated as Cash Flow hedge Non Current Assets 115 57    
Investments at fair value through other comprehensive income Non Current Assets 0 0    
Other non-current assets 0 0    
Total financial assets 139 68    
Short-term debt 0 0    
Trade payables 0 0    
Other payables 0 0    
Foreign currency and interest derivative designated as economic hedge Current Liabilities 0 0    
Energy and marine transport derivative designated as economic hedge Current Liabilities 0 0    
Long-term debt and debentures 0 0    
Foreign currency and interest derivative designated as economic hedge Non Current Liabilities 0 0    
Foreign currency and interest derivative instruments designated as cash flow hedge Non Current Liabilities 0      
Other non-current liabilities 0 0    
Total financial liabilities 0 0    
Total financial instruments, net 139 68    
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 53 40    
Foreign currency and interest derivative designated as economic hedge Current Assets 0 0    
Energy and marine transport derivative designated as economic hedge Current Assets   0    
Foreign currency and interest derivative designated as Cash Flow hedge Non Current Assets 0 0    
Investments at fair value through other comprehensive income Non Current Assets 83 111    
Other non-current assets 0 0    
Total financial assets 136 151    
Short-term debt 0 0    
Trade payables 0 0    
Other payables 0 0    
Foreign currency and interest derivative designated as economic hedge Current Liabilities 0 0    
Energy and marine transport derivative designated as economic hedge Current Liabilities 0 0    
Long-term debt and debentures 0 0    
Foreign currency and interest derivative designated as economic hedge Non Current Liabilities 0 0    
Foreign currency and interest derivative instruments designated as cash flow hedge Non Current Liabilities 0      
Other non-current liabilities 0 0    
Total financial liabilities 0 0    
Total financial instruments, net 136 151    
Measured at amortized cost [Member]        
Disclosure of financial instruments [Line Items]        
Cash and cash equivalents 214 95    
Short-term investments and deposits 100 96    
Trade receivables 883 778    
Other receivables 122 105    
Investments at fair value through other comprehensive income 0 0    
Foreign currency and interest derivative designated as economic hedge Current Assets 0 0    
Energy and marine transport derivative designated as economic hedge Current Assets   0    
Foreign currency and interest derivative designated as Cash Flow hedge Non Current Assets 0 0    
Investments at fair value through other comprehensive income Non Current Assets 0 0    
Other non-current assets 8 6    
Total financial assets 1,327 1,080    
Short-term debt 0 0    
Trade payables 0 0    
Other payables 0 0    
Foreign currency and interest derivative designated as economic hedge Current Liabilities 0 0    
Energy and marine transport derivative designated as economic hedge Current Liabilities 0 0    
Long-term debt and debentures 0 0    
Foreign currency and interest derivative designated as economic hedge Non Current Liabilities 0 0    
Foreign currency and interest derivative instruments designated as cash flow hedge Non Current Liabilities 0      
Other non-current liabilities 0 0    
Total financial liabilities 0 0    
Total financial instruments, net 1,327 1,080    
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    
Foreign currency and interest derivative designated as economic hedge Current Assets 0 0    
Energy and marine transport derivative designated as economic hedge Current Assets   0    
Foreign currency and interest derivative designated as Cash Flow hedge Non Current Assets 0 0    
Investments at fair value through other comprehensive income Non Current Assets 0 0    
Other non-current assets 0 0    
Total financial assets 0 0    
Short-term debt 0 0    
Trade payables 0 0    
Other payables 0    
Foreign currency and interest derivative designated as economic hedge Current Liabilities (42) (5)    
Energy and marine transport derivative designated as economic hedge Current Liabilities (1) (3)    
Long-term debt and debentures 0 0    
Foreign currency and interest derivative designated as economic hedge Non Current Liabilities (13) (6)    
Foreign currency and interest derivative instruments designated as cash flow hedge Non Current Liabilities (28)      
Other non-current liabilities 0 0    
Total financial liabilities (84) (14)    
Total financial instruments, net (84) (14)    
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    
Foreign currency and interest derivative designated as economic hedge Current Assets 0 0    
Energy and marine transport derivative designated as economic hedge Current Assets   0    
Foreign currency and interest derivative designated as Cash Flow hedge Non Current Assets 0 0    
Investments at fair value through other comprehensive income Non Current Assets 0 0    
Other non-current assets 0 0    
Total financial assets 0 0    
Short-term debt (679) (420)    
Trade payables (740) (712)    
Other payables (156) (128)    
Foreign currency and interest derivative designated as economic hedge Current Liabilities 0    
Energy and marine transport derivative designated as economic hedge Current Liabilities 0    
Long-term debt and debentures (2,053) (2,181)    
Foreign currency and interest derivative designated as economic hedge Non Current Liabilities 0    
Foreign currency and interest derivative instruments designated as cash flow hedge Non Current Liabilities 0      
Other non-current liabilities (53) (38)    
Total financial liabilities (3,681) (3,479)    
Total financial instruments, net $ (3,681) $ (3,479)