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Fair Value Measurements and Derivatives - Deferred Gain (Loss) in AOCI on Cash Flow Hedging Relationships (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | $ 3 |
Forward Contracts [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | 3 |
Currency Swap [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | 0 |
Cash Flow Hedging [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI before Tax | (53) | $ (58)
Cash Flow Hedging [Member] | Forward Contracts [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI before Tax | 3 | 2
Cash Flow Hedging [Member] | Currency Swap [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI before Tax | $ (56) | $ (60)

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- Definition Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). + References No definition available. + Details
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- Definition The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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- Details
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