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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, 2017
Dec. 31, 2016
U.S Dollar risk[Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances $ (1,865) $ (1,798)
U.S Dollar risk[Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 565 612
U.S Dollar risk[Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 19 12
U.S Dollar risk[Member] | Short term investments and deposits [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 82 18
U.S Dollar risk[Member] | Trade receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 419 533
U.S Dollar risk[Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 40 41
U.S Dollar risk[Member] | Financial assets available for sale [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 5 8
U.S Dollar risk[Member] | Total financial liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 2,430 2,410
U.S Dollar risk[Member] | Short-term credit [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 427 254
U.S Dollar risk[Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 187 138
U.S Dollar risk[Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 95 35
U.S Dollar risk[Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 1,721 1,983
Euro risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 204 57
Euro risk [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 267 222
Euro risk [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 18 22
Euro risk [Member] | Short term investments and deposits [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 1 0
Euro risk [Member] | Trade receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 246 199
Euro risk [Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 1 0
Euro risk [Member] | Financial assets available for sale [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 446 471
Euro risk [Member] | Short-term credit [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 158 101
Euro risk [Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 182 161
Euro risk [Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 77 59
Euro risk [Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 29 150
British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 41 94
British Pound risk [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 55 38
British Pound risk [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 7 2
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 48 36
British Pound risk [Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
British Pound risk [Member] | Financial assets available for sale [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 58 54
British Pound risk [Member] | Short-term credit [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 20 21
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 15 10
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 111 725
Israeli Shekel risk [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 99 57
Israeli Shekel risk [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 1 2
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 59 50
Israeli Shekel risk [Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 39 5
Israeli Shekel risk [Member] | Financial assets available for sale [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 0 0
Israeli Shekel risk [Member] | Total financial liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 943 985
Israeli Shekel risk [Member] | Short-term credit [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 36 38
Israeli Shekel risk [Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 289 201
Israeli Shekel risk [Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 96 204
Israeli Shekel risk [Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 522 542
Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances (13) 34
Chinese Yuan Renminbi risk [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 331 380
Chinese Yuan Renminbi risk [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 22 38
Chinese Yuan Renminbi risk [Member] | Short term investments and deposits [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 5 5
Chinese Yuan Renminbi risk [Member] | Trade receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 92 84
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] | Financial assets available for sale [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 212 253
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 377 376
Chinese Yuan Renminbi risk [Member] | Short-term credit [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 173 165
Chinese Yuan Renminbi risk [Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 85 107
Chinese Yuan Renminbi risk [Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 21 17
Chinese Yuan Renminbi risk [Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 98 87
U.S Dollar/Brazilian Real risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances (6) (25)
U.S Dollar/Brazilian Real risk [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 41 31
U.S Dollar/Brazilian Real risk [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 7 4
U.S Dollar/Brazilian Real risk [Member] | Short term investments and deposits [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
U.S Dollar/Brazilian Real risk [Member] | Trade receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 31 27
U.S Dollar/Brazilian Real risk [Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
U.S Dollar/Brazilian Real risk [Member] | Financial assets available for sale [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
U.S Dollar/Brazilian Real risk [Member] | Other non-current assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 3 0
U.S Dollar/Brazilian Real risk [Member] | Total financial liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 47 56
U.S Dollar/Brazilian Real risk [Member] | Short-term credit [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 8 9
U.S Dollar/Brazilian Real risk [Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 15 9
U.S Dollar/Brazilian Real risk [Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 2 2
U.S Dollar/Brazilian Real risk [Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 22 36
Other [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 71 54
Other [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 49 50
Other [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 9 7
Other [Member] | Short term investments and deposits [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 2 6
Other [Member] | Trade receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 37 37
Other [Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 1 0
Other [Member] | Financial assets available for sale [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 14 13
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 9 6
Other [Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 5 7
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 (1,865) (1,798)
Non-derivative instruments [Member] | Euro risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances (179) (249)
Non-derivative instruments [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances (3) (16)
Non-derivative instruments [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances (844) (928)
Non-derivative instruments [Member] | Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances (46) 4
Non-derivative instruments [Member] | U.S Dollar/Brazilian Real risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances (6) (25)
Non-derivative instruments [Member] | Other [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 35 37
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 383 306
Derivative instruments [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 44 110
Derivative instruments [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 955 1,653
Derivative instruments [Member] | Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 33 30
Derivative instruments [Member] | U.S Dollar/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 36 17
Swap contract [Member] | U.S Dollar risk[Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances   0
Swap contract [Member] | Euro risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances   0
Swap contract [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances   0
Swap contract [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances   571
Swap contract [Member] | Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances   0
Swap contract [Member] | U.S Dollar/Brazilian Real risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances   0
Swap contract [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 63 41
Cylinder instruments [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 26
Cylinder instruments [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 525 599
Cylinder instruments [Member] | Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Cylinder instruments [Member] | U.S Dollar/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 320 265
Forward contracts [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 44 84
Forward contracts [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 430 483
Forward contracts [Member] | Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 33 30
Forward contracts [Member] | U.S Dollar/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 $ 33 $ 14