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Financial Instruments and Risk Management (Market Risk - Terms of Derivative Financial Instruments Used to Hedge Interest Risk) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount (fair value) | $ 275 | $ 270
SWAP contracts from fixed interest to variable interest - EUR [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount (fair value) | (1) |
Stated amount | $ 51 |
Maturity date (in years) | 0-1 |
Interest rate range | 1-month Libor |
SWAP contracts from fixed interest to variable interest - ILS [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount (fair value) | $ 64 |
Stated amount | $ 489 |
Maturity date (in years) | 0-4 |
Interest rate range | 2.45% - 4.74% |
SWAP contracts from fixed interest to variable interest - USD [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount (fair value) | $ (3) | (6)
Stated amount | $ 350 | $ 380
Maturity date (in years) | 0-7 | 0-4
Interest rate range | 1.36% - 2.6% | 1.4%-3.2%
Cylinder instruments [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Carrying amount (fair value) |  |
Stated amount |  |
Maturity date (in years) |  |
Interest rate range |  |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + 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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