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Summary of Significant Accounting Policies - Remaining Performance Obligations (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
$ in Millions
Jun. 30, 2019
USD ($)
Remaining Performance Obligations  
Remaining performance obligations $ 1,500
Expected timing of performance obligations 12 months
Minimum  
Remaining Performance Obligations  
Expected percentage of remaining performance obligations 80.00%
Maximum  
Remaining Performance Obligations  
Expected percentage of remaining performance obligations 85.00%