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Revenue (Narrative) (Details)
$ in Millions
Jun. 30, 2021
USD ($)
Revenue from Contract with Customer [Abstract]  
Remaining performance obligation $ 438
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01  
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]  
Expected timing of recognition 60 months