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Revenue from Contracts with Customers - Remaining Performance Obligation (Details)
$ in Billions
Dec. 31, 2019
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 | Products and Systems Integration  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected timing of satisfaction, period 12 months
Remaining performance obligation amount $ 1.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 | Managed and Support Services | Software and Services  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected timing of satisfaction, period 12 months
Remaining performance obligation amount $ 1.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation amount 7.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil) | Products and Systems Integration  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation amount 3.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil) | Software and Services  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation amount $ 4.1