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Derivatives And Hedging Activities Derivatives Not Designated as Hedges (Details) $ in Millions, ₩ in Billions | 9 Months Ended |
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Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Mar. 01, 2018 USD ($) | Mar. 01, 2018 KRW (₩)
Derivative [Line Items] |  |  |  |
Derivative, Cash Received on Hedge | $ (6) | $ (12) |  |
Not Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Loss on Derivative |  | $ 5 |  |
KUM | Not Designated as Hedging Instrument | Foreign exchange forward | Korea (South), Won |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount of derivative |  |  | $ 520 | ₩ 559
Derivative, Cash Received on Hedge | 4 |  |  |
Derivative, Gain (Loss) on Derivative, Net | $ 4 |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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- Definition Amount of decrease in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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- Definition The net cash outflow or inflow from derivative instruments during the period, which are classified as investing activities, excluding those designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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