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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, 2020
Dec. 31, 2019
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances $ (21) $ (173)
Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 1,463 1,231
Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 214 95
Short term investments and deposits [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 100 96
Trade receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 883 778
Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 122 105
Measured at fair value through the statement of comprehensive income [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 136 151
Other non-current assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 8  
Total financial liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 3,681 3,480
Short-term debt [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 679 420
Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 740 712
Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 156 128
Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 2,053 2,182
Other non-current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 53 38
U.S Dollar risk[Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances (937) (1,266)
U.S Dollar risk[Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 729 575
U.S Dollar risk[Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 114 18
U.S Dollar risk[Member] | Short term investments and deposits [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 88 89
U.S Dollar risk[Member] | Trade receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 454 381
U.S Dollar risk[Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 72 84
U.S Dollar risk[Member] | Measured at fair value through the statement of 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 1 3
U.S Dollar risk[Member] | Total financial liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 1,666 1,841
U.S Dollar risk[Member] | Short-term debt [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 267 198
U.S Dollar risk[Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 145 172
U.S Dollar risk[Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 41 19
U.S Dollar risk[Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 1,211 1,452
U.S Dollar risk[Member] | Other non-current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 2 0
Euro risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 422 378
Euro risk [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 289 214
Euro risk [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 13 19
Euro risk [Member] | Short term investments and deposits [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 5 1
Euro risk [Member] | Trade receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 227 177
Euro risk [Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 41 16
Euro risk [Member] | Measured at fair value through the statement of 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 3 1
Euro risk [Member] | Total financial liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 388 389
Euro risk [Member] | Short-term debt [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 70 95
Euro risk [Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 163 178
Euro risk [Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 68 44
Euro risk [Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 36 34
Euro risk [Member] | Other non-current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 51 38
British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 8 16
British Pound risk [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 40 41
British Pound risk [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 5 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 35 37
British Pound risk [Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
British Pound risk [Member] | Measured at fair value through the statement of 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 132 73
British Pound risk [Member] | Short-term debt [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 85 18
British Pound risk [Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 21 22
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 22 29
British Pound risk [Member] | Other non-current liabilities [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 305 500
Israeli Shekel risk [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 67 57
Israeli Shekel risk [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 2 4
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 58 50
Israeli Shekel risk [Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 7 3
Israeli Shekel risk [Member] | Measured at fair value through the statement of 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 0
Israeli Shekel risk [Member] | Total financial liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 1,240 948
Israeli Shekel risk [Member] | Short-term debt [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 181 58
Israeli Shekel risk [Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 326 247
Israeli Shekel risk [Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 17 47
Israeli Shekel risk [Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 716 596
Israeli Shekel risk [Member] | Other non-current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 54 65
Chinese Yuan Renminbi risk [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 251 235
Chinese Yuan Renminbi risk [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 60 33
Chinese Yuan Renminbi risk [Member] | Short term investments and deposits [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 4 3
Chinese Yuan Renminbi risk [Member] | Trade receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 51 48
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] | Measured at fair value through the statement of comprehensive income [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 136 151
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 220 198
Chinese Yuan Renminbi risk [Member] | Short-term debt [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 68 47
Chinese Yuan Renminbi risk [Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 66 79
Chinese Yuan Renminbi risk [Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 26 12
Chinese Yuan Renminbi risk [Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 60 60
Chinese Yuan Renminbi risk [Member] | Other non-current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Brazilian Real risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 46 10
Brazilian Real risk [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 31 30
Brazilian Real risk [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 6 6
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 21 22
Brazilian Real risk [Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Brazilian Real risk [Member] | Measured at fair value through the statement of 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 2
Brazilian Real risk [Member] | Total financial liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 20 20
Brazilian Real risk [Member] | Short-term debt [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 7 4
Brazilian Real risk [Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 11 9
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 2 7
Brazilian Real risk [Member] | Other non-current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Other [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 81 124
Other [Member] | Total financial assets [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 56 79
Other [Member] | Cash and cash equivalents [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 14 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 37 63
Other [Member] | Other receivables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 2 2
Other [Member] | Measured at fair value through the statement of 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 11
Other [Member] | Short-term debt [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 1 0
Other [Member] | Trade payables [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 8 5
Other [Member] | Other current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 2
Other [Member] | Long term debt, debentures and others [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 6 4
Other [Member] | Other non-current liabilities [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0 0
Non-derivative instruments [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances (2,218) (2,249)
Non-derivative instruments [Member] | U.S Dollar risk[Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances (937) (1,266)
Non-derivative instruments [Member] | Euro risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances (99) (175)
Non-derivative instruments [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances (92) (32)
Non-derivative instruments [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances (1,173) (891)
Non-derivative instruments [Member] | Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 31 37
Non-derivative instruments [Member] | Brazilian Real risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 11 10
Non-derivative instruments [Member] | Other [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 41 68
Derivative instruments [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 2,197 2,076
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 521 553
Derivative instruments [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 100 48
Derivative instruments [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 1,478 1,391
Derivative instruments [Member] | Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 23 28
Derivative instruments [Member] | Brazilian Real risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 35 0
Derivative instruments [Member] | Other [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 40 56
SWAP USD into ILS [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 701 482
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 701 482
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]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 324 447
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 324 447
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
SWAP USD into GBP [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 63  
SWAP USD into GBP [Member] | U.S Dollar risk[Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0  
SWAP USD into GBP [Member] | Euro risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0  
SWAP USD into GBP [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 63  
SWAP USD into GBP [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0  
SWAP USD into GBP [Member] | Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0  
SWAP USD into GBP [Member] | Brazilian Real risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0  
SWAP USD into GBP [Member] | Other [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 0  
Cylinder instruments [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 479 660
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 47 45
Cylinder instruments [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 10 15
Cylinder instruments [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 400 600
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 20 0
Cylinder instruments [Member] | Other [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 2 0
Forward contracts [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 630 487
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 150 61
Forward contracts [Member] | British Pound risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 27 33
Forward contracts [Member] | Israeli Shekel risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 377 309
Forward contracts [Member] | Chinese Yuan Renminbi risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 23 28
Forward contracts [Member] | Brazilian Real risk [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances 15 0
Forward contracts [Member] | Other [Member]    
Disclosure of financial instruments [Line Items]    
Exposure on monetary balances $ 38 $ 56