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Financial Instruments and Risk Management (Market risk - Terms of Derivative Financial Instruments Used to Economically Hedge Foreign Currency Risk) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount | $ 275 | $ 270
Put options [Member] | Israeli Shekel/U.S Dollar [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount | 5 | 4
Stated amount | $ 525 | $ 599
Average exchange rate | 3.4 | 3.7
Put options [Member] | U.S Dollar/Euro [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount | $ 0 | $ 2
Stated amount | $ 63 | $ 41
Average exchange rate | 1.2 | 1.1
Put options [Member] | U.S Dollar/British Pound [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount |  | $ (1)
Stated amount |  | $ 11
Average exchange rate |  | 1.3
Put options [Member] | Euro/British Pound [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount |  | $ 0
Stated amount |  | $ 15
Average exchange rate |  | 0.8
Put options [Member] | U.S Dollar/Japanese Yen [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount | $ 0 | $ 0
Stated amount | $ 3 | $ 3
Average exchange rate | 115.5 | 107.7
Call options [Member] | Israeli Shekel/U.S Dollar [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount | $ (1) | $ (6)
Stated amount | $ 525 | $ 599
Average exchange rate | 3.4 | 3.7
Call options [Member] | U.S Dollar/Euro [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount | $ (2) | $ 0
Stated amount | $ 63 | $ 41
Average exchange rate | 1.2 | 1.1
Call options [Member] | U.S Dollar/British Pound [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount | $ 0 | $ 0
Stated amount | $ 0 | $ 11
Average exchange rate | 0.000 | 1.3
Call options [Member] | Euro/British Pound [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount | $ 0 | $ 0
Stated amount | $ 0 | $ 15
Average exchange rate | 0.000 | 0.8
Call options [Member] | U.S Dollar/Japanese Yen [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount | $ 0 | $ 0
Stated amount | $ 3 | $ 3
Average exchange rate | 115.5 | 107.7
Swap contract [Member] | Israeli Shekel/U.S Dollar [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount | $ 64 | $ 3
Stated amount | $ 489 | $ 571
Average exchange rate | 3.7 | 3.7
SWAP contracts from fixed interest to variable interest - EUR [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount | $ (1) |
Stated amount | 51 |
SWAP contracts from fixed interest to variable interest - ILS [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount | 64 |
Stated amount | 489 |
SWAP contracts from fixed interest to variable interest - USD [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount | (3) | $ (6)
Stated amount | 350 | 380
Cylinder instruments [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount |  |
Stated amount |  |
Forward contracts [Member] | Israeli Shekel/U.S Dollar [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount | 2 | 0
Stated amount | $ 430 | $ 483
Average exchange rate | 3.5 | 3.8
Forward contracts [Member] | U.S Dollar/Euro [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount | $ (3) | $ 4
Stated amount | $ 320 | $ 265
Average exchange rate | 1.2 | 1.1
Forward contracts [Member] | U.S Dollar/British Pound [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount | $ 0 | $ 1
Stated amount | $ 24 | $ 84
Average exchange rate | 1.3 | 1.3
Forward contracts [Member] | Euro/British Pound [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount | $ 0 |
Stated amount | $ 20 |
Average exchange rate | 0.9 |
Forward contracts [Member] | U.S Dollar/Chinese Yuan Renminbi [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount | $ (1) | $ 1
Stated amount | $ 33 | $ 30
Average exchange rate | 6.7 | 6.8
Forward contracts [Member] | Other [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount | $ 0 | $ 0
Stated amount | $ 33 | $ 14
Average exchange rate | 0.0 | 0.0

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- Definition The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 22 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_22_b&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The gain (loss) on the change in fair value of the hedging instrument used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24A -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24A_c&doctype=Standard -URIDate 2017-03-09 + Details
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