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Summary of Significant Accounting Policies - Performance Obligation (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Accounting Policies [Abstract]  
Remaining performance obligation $ 4,400
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Percent of remaining performance obligation expected to be recognized 65.50%
Recognition period for remaining performance obligation 12 months