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Financial Instruments and Risk Management (Market risk - Linkage Terms of Monetary Balances) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
U.S Dollar risk[Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances $ (1,031) $ (1,865)
U.S Dollar risk[Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 697 565
U.S Dollar risk[Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 41 19
U.S Dollar risk[Member] | Short term investments and deposits [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 74 82
U.S Dollar risk[Member] | Trade receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 516 419
U.S Dollar risk[Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 6 40
U.S Dollar risk[Member] | Investments at fair value through other comprehensive income [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
U.S Dollar risk[Member] | Other non-current assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 60 5
U.S Dollar risk[Member] | Total financial liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 1,728 2,430
U.S Dollar risk[Member] | Short-term credit [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 201 427
U.S Dollar risk[Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 150 187
U.S Dollar risk[Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 55 95
U.S Dollar risk[Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 1,322 1,721
Euro risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 319 204
Euro risk [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 259 267
Euro risk [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 21 18
Euro risk [Member] | Short term investments and deposits [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 3 1
Euro risk [Member] | Trade receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 222 246
Euro risk [Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 12 1
Euro risk [Member] | Investments at fair value through other comprehensive income [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Euro risk [Member] | Other non-current assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 1 1
Euro risk [Member] | Total financial liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 405 446
Euro risk [Member] | Short-term credit [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 166 158
Euro risk [Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 188 182
Euro risk [Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 46 77
Euro risk [Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 5 29
British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 77 41
British Pound risk [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 64 55
British Pound risk [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 4 7
British Pound risk [Member] | Short term investments and deposits [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
British Pound risk [Member] | Trade receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 60 48
British Pound risk [Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
British Pound risk [Member] | Investments at fair value through other comprehensive income [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
British Pound risk [Member] | Other non-current assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
British Pound risk [Member] | Total financial liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 49 58
British Pound risk [Member] | Short-term credit [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 19 20
British Pound risk [Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 23 23
British Pound risk [Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 7 15
British Pound risk [Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 637 111
Israeli Shekel risk [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 75 99
Israeli Shekel risk [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 2 1
Israeli Shekel risk [Member] | Short term investments and deposits [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Israeli Shekel risk [Member] | Trade receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 60 59
Israeli Shekel risk [Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 12 39
Israeli Shekel risk [Member] | Investments at fair value through other comprehensive income [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Israeli Shekel risk [Member] | Other non-current assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 1 0
Israeli Shekel risk [Member] | Total financial liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 971 943
Israeli Shekel risk [Member] | Short-term credit [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 34 36
Israeli Shekel risk [Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 265 289
Israeli Shekel risk [Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 192 96
Israeli Shekel risk [Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 480 522
Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 19 (13)
Chinese Yuan Renminbi risk [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 266 331
Chinese Yuan Renminbi risk [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 37 22
Chinese Yuan Renminbi risk [Member] | Short term investments and deposits [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 12 5
Chinese Yuan Renminbi risk [Member] | Trade receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 72 92
Chinese Yuan Renminbi risk [Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Chinese Yuan Renminbi risk [Member] | Investments at fair value through other comprehensive income [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 145 212
Chinese Yuan Renminbi risk [Member] | Other non-current assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Chinese Yuan Renminbi risk [Member] | Total financial liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 276 377
Chinese Yuan Renminbi risk [Member] | Short-term credit [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 184 173
Chinese Yuan Renminbi risk [Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 72 85
Chinese Yuan Renminbi risk [Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 19 21
Chinese Yuan Renminbi risk [Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 1 98
Brazilian Real risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 2 (6)
Brazilian Real risk [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 34 41
Brazilian Real risk [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 5 7
Brazilian Real risk [Member] | Short term investments and deposits [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Brazilian Real risk [Member] | Trade receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 25 31
Brazilian Real risk [Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Brazilian Real risk [Member] | Investments at fair value through other comprehensive income [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Brazilian Real risk [Member] | Other non-current assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 4 3
Brazilian Real risk [Member] | Total financial liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 32 47
Brazilian Real risk [Member] | Short-term credit [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 6 8
Brazilian Real risk [Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 11 15
Brazilian Real risk [Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 2 2
Brazilian Real risk [Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 13 22
Other [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 74 71
Other [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 49 49
Other [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 11 9
Other [Member] | Short term investments and deposits [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 3 2
Other [Member] | Trade receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 35 37
Other [Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 1
Other [Member] | Investments at fair value through other comprehensive income [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Other [Member] | Other non-current assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Other [Member] | Total financial liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 15 14
Other [Member] | Short-term credit [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Other [Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 6 9
Other [Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 9 5
Other [Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Non-derivative instruments [Member] | U.S Dollar risk[Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances (1,031) (1,865)
Non-derivative instruments [Member] | Euro risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances (146) (179)
Non-derivative instruments [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 15 (3)
Non-derivative instruments [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances (896) (844)
Non-derivative instruments [Member] | Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances (10) (46)
Non-derivative instruments [Member] | Brazilian Real risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 2 (6)
Non-derivative instruments [Member] | Other [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 34 35
Derivative instruments [Member] | U.S Dollar risk[Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Derivative instruments [Member] | Euro risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 465 383
Derivative instruments [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 62 44
Derivative instruments [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 1,533 955
Derivative instruments [Member] | Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 29 33
Derivative instruments [Member] | Brazilian Real risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Derivative instruments [Member] | Other [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 40 36
SWAP USD into ILS [Member] | U.S Dollar risk[Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0  
SWAP USD into ILS [Member] | Euro risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0  
SWAP USD into ILS [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0  
SWAP USD into ILS [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 486  
SWAP USD into ILS [Member] | Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0  
SWAP USD into ILS [Member] | Brazilian Real risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0  
SWAP USD into ILS [Member] | Other [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0  
SWAP USD into Euro [Member] | U.S Dollar risk[Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0  
SWAP USD into Euro [Member] | Euro risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 334  
SWAP USD into Euro [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0  
SWAP USD into Euro [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0  
SWAP USD into Euro [Member] | Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0  
SWAP USD into Euro [Member] | Brazilian Real risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0  
SWAP USD into Euro [Member] | Other [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0  
Cylinder instruments [Member] | U.S Dollar risk[Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Cylinder instruments [Member] | Euro risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 45 63
Cylinder instruments [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 11 0
Cylinder instruments [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 695 525
Cylinder instruments [Member] | Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Cylinder instruments [Member] | Brazilian Real risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Cylinder instruments [Member] | Other [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 3 3
Forward contracts [Member] | U.S Dollar risk[Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Forward contracts [Member] | Euro risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 86 320
Forward contracts [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 51 44
Forward contracts [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 352 430
Forward contracts [Member] | Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 29 33
Forward contracts [Member] | Brazilian Real risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Forward contracts [Member] | Other [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances $ 37 $ 33