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Revenue (Details)
$ in Billions
Sep. 30, 2019
USD ($)
Revenue from Contract with Customer [Abstract]  
Remaining performance obligation $ 25.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation percentage 26.00%
Remaining performance obligation period 6 months