Segment and Revenue Information Segment and Revenue Information (Narrative) (Details) $ in Millions	9 Months Ended
Sep. 30, 2018 USD ($) segments
Segment Reporting Information [Line Items]
Number of Reportable Segments \| segments	4
Revenue, Remaining Performance Obligation, Amount \| $	$ 491,179
Fiscal Year 2019 [Member]
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Percent Recognized	24.00%
Fiscal Year 2022 [Member]
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Percent Recognized	69.00%

The amount of the remaining performance obligation expected to be recognized as revenue.

No definition available.

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

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- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045

+ 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.

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