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Revenue Recognition (Performance obligations) (Details)
$ in Millions
Mar. 31, 2021
USD ($)
Revenue from Contract with Customer [Abstract]  
Revenue, remaining performance obligation, amount $ 573
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01  
Revenue from Contract with Customer [Abstract]  
Revenue, remaining performance obligation, amount $ 390
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, remaining performance obligation, period 9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01  
Revenue from Contract with Customer [Abstract]  
Revenue, remaining performance obligation, amount $ 183
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, remaining performance obligation, period 1 year