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Revenue Recognition Remaining Performance Obligations (Tables) | 6 Months Ended
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Jun. 30, 2018
Remaining Performance Obligations [Abstract] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] | Remaining performance obligations ("RPO") are the aggregate amount of total contract transaction price that is unsatisfied or partially unsatisfied. As of June 30, 2018, our total RPO is $103.4 billion. Of this total, we expect approximately 45% will be recognized as sales over the following 24 months.

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- Definition Tabular disclosure of expected timing for satisfying remaining performance obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045 + Details
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