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Derivative Instruments (Narrative) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Nov. 30, 2018 EUR (€)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Ineffectiveness recorded as a result of fair value hedges | 0 |  |
Senior Unsecured Notes 3.375% due 2024 |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Debt instrument, face amount | $ 600 |  |
Foreign currency exchange forward contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional amount | 6,336 | $ 5,871 |
Designated as Hedging Instrument | Foreign currency exchange forward contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional amount | 870 | 1,104 | € 2,250,000,000
Fair value of designated net investment hedges | 19 |  |
Gains on derivatives designated as hedges | 13 | $ 7 |
Gain due to ineffective portions of derivatives | 1 |  |
Designated as Hedging Instrument | Interest rate swap asset |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional amount | 600 |  |
Terminated notional amount | $ 500 |  |

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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 Derivative Instrument, Terminated Notional Amount + References No definition available. + Details
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- Definition The estimated net amount of existing gains or losses on 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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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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