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Deferred Revenue and Performance Obligations - Narrative (Details)
$ in Billions
Sep. 30, 2018
USD ($)
Revenue from Contract with Customer [Abstract]  
Remaining performance obligations $ 1.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, remaining performance obligation, percentage 51.00%
Expected timing of satisfaction period 1 year