Revenue (Narrative) (Details) $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($)
Disaggregation of Revenue [Line Items]
Advanced billings, revenue recognized	$ 55
Expected timing of satisfaction period	12 months
Business services \| Minimum
Disaggregation of Revenue [Line Items]
Period of recognition	1 year
Business services \| Maximum
Disaggregation of Revenue [Line Items]
Period of recognition	5 years

Revenue From Contract With Customer, Period Of Recognition

No definition available.

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045

+ 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.

+ Details

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- Definition

Description of when remaining performance obligation is expected to be 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 (b)(2)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

+ Details

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- Details

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