v3.19.3
Revenue - Remaining Performance Obligation (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Revenue from Contract with Customer [Abstract]  
Performance obligation, amount $ 100
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01  
Revenue from Contract with Customer [Abstract]  
Performance obligation, amount $ 52
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01  
Revenue from Contract with Customer [Abstract]  
Performance obligation, amount $ 48
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance period