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Revenue Revenue (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
performance_obligation
Disaggregation of Revenue [Line Items]  
Number of Types of Performance Obligations | performance_obligation 2
Contract with Customer, Refund Liability | $ $ 0
Stand Ready Performance Obligations [Member]  
Disaggregation of Revenue [Line Items]  
Revenue, Performance Obligation, Description of Good or Service those that require us to stand ready to provide goods and services to a customer to use as and when requested (“Stand Ready Performance Obligations”)
Other Performance Obligations [Member]  
Disaggregation of Revenue [Line Items]  
Revenue, Performance Obligation, Description of Good or Service those that do not require us to stand ready (“Other Performance Obligations”)