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Revenue Recognition (Transaction Price Allocated to the Remaining Performance Obligations) (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Revenue from Contract with Customer [Abstract]  
Revenue, remaining performance obligation $ 265
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, remaining performance obligation, percentage 50.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, remaining performance obligation, percentage 35.00%