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Basis of Presentation and Summary of Significant Accounting Policies - Remaining Performance Obligations (Details)
$ in Billions
Dec. 31, 2018
USD ($)
Accounting Policies [Abstract]  
Revenue, Remaining Performance Obligation, Amount $ 2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Percentage 67.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 2 years