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Acquisitions Fair Value of Intangible Assets and Related Weighted Average Useful Lives (Details) - Unisys Federal
$ in Millions
Mar. 13, 2020
USD ($)
Business Acquisition [Line Items]  
Finite-lived Intangible Assets Acquired $ 574
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 12 years
Order or Production Backlog [Member]  
Business Acquisition [Line Items]  
Finite-lived Intangible Assets Acquired $ 47
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 1 year
Technology-Based Intangible Assets [Member]  
Business Acquisition [Line Items]  
Finite-lived Intangible Assets Acquired $ 7
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 1 year
Customer Relationships [Member]  
Business Acquisition [Line Items]  
Finite-lived Intangible Assets Acquired $ 520
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 13 years