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Financial Instruments and Risk Management (Hierarchy of Fair Value) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of financial instruments [Line Items] |  |  |
Securities held for trading purposes |  |  | $ 10
Financial assets available for sale |  | $ 212 | 253
Derivatives used for economic hedging, net |  | 63 | 7
Total |  | 275 | 270
Level 1 [Member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Securities held for trading purposes |  |  | 10
Financial assets available for sale | [1] | 0 | 0
Derivatives used for economic hedging, net |  | 0 | 0
Total |  | 0 | 10
Level 2 [Member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Securities held for trading purposes |  |  | 0
Financial assets available for sale | [1] | 212 | 253
Derivatives used for economic hedging, net |  | 63 | 7
Total |  | $ 275 | $ 260
[1] | Investment in 15% of the share capital of YTH, which is subject to a three-year lock up period as required by Chinese law, which will expire in January 2019. Measurement of the fair value of the discount rate in respect of the lock up period was calculated by use of the Finnerty 2012 Model and is based on an estimate of the period in which the restriction on marketability applies and a standard deviation of the yield on a YTH share in this period. The impact deriving from a possible and reasonable change in these data items, which are not observed, is not material.

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- Definition The amount of non-derivative financial assets that are designated as available for sale or are not classified as (a) loans and receivables; (b) held-to-maturity investments; or (c) financial assets at fair value through profit or loss. [Refer: Derivative financial assets; Financial assets at fair value through profit or loss; Held-to-maturity investments] + 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 8 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_d&doctype=Standard&book=B -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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