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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, 2019
Dec. 31, 2018
U.S Dollar risk[Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances $ (1,266) $ (1,014)
U.S Dollar risk[Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 575 697
U.S Dollar risk[Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 18 41
U.S Dollar risk[Member] | Short term investments and deposits [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 89 74
U.S Dollar risk[Member] | Trade receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 381 516
U.S Dollar risk[Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 84 6
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 3 60
U.S Dollar risk[Member] | Total financial liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 1,841 1,711
U.S Dollar risk[Member] | Short-term credit [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 198 201
U.S Dollar risk[Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 172 150
U.S Dollar risk[Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 19 38
U.S Dollar risk[Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 1,452 1,322
Euro risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 378 337
Euro risk [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 214 259
Euro risk [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 19 21
Euro risk [Member] | Short term investments and deposits [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 1 3
Euro risk [Member] | Trade receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 177 222
Euro risk [Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 16 12
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 389 387
Euro risk [Member] | Short-term credit [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 95 166
Euro risk [Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 178 188
Euro risk [Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 44 28
Euro risk [Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 72 5
British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 16 80
British Pound risk [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 41 64
British Pound risk [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 4 4
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 37 60
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 73 46
British Pound risk [Member] | Short-term credit [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 18 19
British Pound risk [Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 22 23
British Pound risk [Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 4 4
British Pound risk [Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 29 0
Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 500 776
Israeli Shekel risk [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 57 75
Israeli Shekel risk [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 4 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 50 60
Israeli Shekel risk [Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 3 12
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 0 1
Israeli Shekel risk [Member] | Total financial liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 948 832
Israeli Shekel risk [Member] | Short-term credit [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 58 34
Israeli Shekel risk [Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 247 265
Israeli Shekel risk [Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 47 53
Israeli Shekel risk [Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 596 480
Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 65 34
Chinese Yuan Renminbi risk [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 235 266
Chinese Yuan Renminbi risk [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 33 37
Chinese Yuan Renminbi risk [Member] | Short term investments and deposits [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 3 12
Chinese Yuan Renminbi risk [Member] | Trade receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 48 72
Chinese Yuan Renminbi risk [Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 40 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 111 145
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 198 261
Chinese Yuan Renminbi risk [Member] | Short-term credit [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 47 184
Chinese Yuan Renminbi risk [Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 79 72
Chinese Yuan Renminbi risk [Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 12 4
Chinese Yuan Renminbi risk [Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 60 1
Brazilian Real risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 10 4
Brazilian Real risk [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 30 34
Brazilian Real risk [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 6 5
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 22 25
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 2 4
Brazilian Real risk [Member] | Total financial liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 20 30
Brazilian Real risk [Member] | Short-term credit [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 4 6
Brazilian Real risk [Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 9 11
Brazilian Real risk [Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Brazilian Real risk [Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 7 13
Other [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 124 79
Other [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 79 49
Other [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 11 11
Other [Member] | Short term investments and deposits [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 3 3
Other [Member] | Trade receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 63 35
Other [Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 2 0
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 11 10
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 5 6
Other [Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 2 4
Other [Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 4 0
Non-derivative instruments [Member] | U.S Dollar risk[Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances (1,266) (1,014)
Non-derivative instruments [Member] | Euro risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances (175) (128)
Non-derivative instruments [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances (32) 18
Non-derivative instruments [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances (891) (757)
Non-derivative instruments [Member] | Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 37 5
Non-derivative instruments [Member] | Brazilian Real risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 10 4
Non-derivative instruments [Member] | Other [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 68 39
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 553 465
Derivative instruments [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 48 62
Derivative instruments [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 1,391 1,533
Derivative instruments [Member] | Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 28 29
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 56 40
SWAP USD into ILS [Member] | U.S Dollar risk[Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
SWAP USD into ILS [Member] | Euro risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
SWAP USD into ILS [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
SWAP USD into ILS [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 482 486
SWAP USD into ILS [Member] | Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
SWAP USD into ILS [Member] | Brazilian Real risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
SWAP USD into ILS [Member] | Other [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
SWAP USD into Euro [Member] | U.S Dollar risk[Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
SWAP USD into Euro [Member] | Euro risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 447 334
SWAP USD into Euro [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
SWAP USD into Euro [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
SWAP USD into Euro [Member] | Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
SWAP USD into Euro [Member] | Brazilian Real risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
SWAP USD into Euro [Member] | Other [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 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 45
Cylinder instruments [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 15 11
Cylinder instruments [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 600 695
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 0 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 61 86
Forward contracts [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 33 51
Forward contracts [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 309 352
Forward contracts [Member] | Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 28 29
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 $ 56 $ 37