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Investments in Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 29, 2018
Mar. 31, 2018
Mar. 31, 2017
Mar. 28, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]          
Long-term liability   $ 152     $ 117
Dividend from unconsolidated affiliate   $ 0 $ 31    
StoneRiver Group, L.P.          
Schedule of Equity Method Investments [Line Items]          
Pre-tax gain on sale     26    
Gain on sale, tax     $ 9    
Percentage of interest owned in affiliate   49.00%      
Dividend from unconsolidated affiliate   $ 31      
Financial | Fiserv Automotive Solutions, LLC          
Schedule of Equity Method Investments [Line Items]          
Controlling interest sold 55.00%        
Financial | Fiserv LS LLC          
Schedule of Equity Method Investments [Line Items]          
Controlling interest sold 55.00%        
Financial | Lending Solutions Business          
Schedule of Equity Method Investments [Line Items]          
Controlling interest sold   55.00%      
Gross cash sale proceeds $ 419        
Pre-tax gain on sale 232 $ 232      
Gain on sale, tax 78 78      
Remeasurement of retained interests $ 124        
Remaining ownership interests 45.00%        
Gain contingency, unrecorded (up to) $ 20        
Investment in affiliate   58      
Long-term liability   $ 34      
Variable-Rate Term Loan Facilities Due March 2023 | Term Loan Facilities | Line of Credit          
Schedule of Equity Method Investments [Line Items]          
Maximum borrowing capacity       $ 350  
Variable-Rate Revolving Credit Facilities Due March 2023 | Revolving Credit Facility | Line of Credit          
Schedule of Equity Method Investments [Line Items]          
Maximum borrowing capacity       $ 35