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Remaining Performance Obligations (Details)
$ in Billions
Jun. 30, 2019
USD ($)
Revenue from Contract with Customer [Abstract]  
Remaining performance obligation $ 1.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation, percent to be recognized as revenue 24.00%
Period over which remaining performance obligations are expected to be recognized as revenue 6 months