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Derivative Financial Instruments - Additional Information (Details) - USD ($) $ in Billions | 3 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |
Notional amounts on foreign currency exchange contracts | $ 2.5 | $ 2.8
Maximum |  |
Derivative [Line Items] |  |
Maturity on derivative instruments | 18 months |
Estimate of time to transfer | 12 months |

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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 Estimated period for the anticipated transfer of gain (loss), net, from accumulated other comprehensive income into earnings, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Details
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