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Investment in Unconsolidated Affiliate (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 29, 2018
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mar. 28, 2018
Schedule of Equity Method Investments [Line Items]                            
Proceeds from sale of businesses                     $ 419,000,000 $ 17,000,000 $ 0  
Gain on sale of businesses   $ 0 $ (2,000,000) $ (3,000,000) $ 232,000,000 $ 0 $ 0 $ 10,000,000 $ 0   227,000,000 10,000,000 0  
Other long-term liabilities   $ 170,000,000       117,000,000         170,000,000 117,000,000    
Non-operating income                     9,000,000      
Processing and services                     4,975,000,000 4,833,000,000 4,625,000,000  
Dividend from unconsolidated affiliate that represents a return on investment                     2,000,000 45,000,000 151,000,000  
Excess cash dividend recorded as income                     $ 10,000,000 32,000,000 147,000,000  
StoneRiver Group L.P.                            
Schedule of Equity Method Investments [Line Items]                            
Percentage of interest owned in unconsolidated affiliate   49.00%                 49.00%      
Investment in unconsolidated affiliate   $ 0       $ 0         $ 0 0    
Dividend from unconsolidated affiliate that represents a return on investment                   $ 140,000,000 2,000,000 45,000,000    
Realized gain on sale of a business                 26,000,000 190,000,000     151,000,000  
Realized gain on sale of a business, tax                 $ 9,000,000 54,000,000        
Excess cash dividend recorded as income                       6,000,000    
Excess cash dividend recorded as income, tax                       2,000,000    
Impairment loss                   44,000,000        
Gain on sale of business interest, net of impairment loss                   $ 146,000,000        
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]                            
Proceeds from sale of businesses $ 419,000,000                          
Gain on sale of businesses, tax 77,000,000                          
Remeasurement of retained interests $ 124,000,000                          
Percentage of interest owned in unconsolidated affiliate 45.00%                          
Gain contingency, unrecorded (up to) $ 20,000,000                          
Investment in unconsolidated affiliate   65,000,000                 65,000,000      
Other long-term liabilities   $ 34,000,000                 34,000,000      
Non-operating income                     5,000,000      
Revolving Credit Facility                            
Schedule of Equity Method Investments [Line Items]                            
Maximum borrowing capacity     $ 2,000,000,000                      
Line of Credit | Variable-Rate Term Loan Facilities Due March 2023 | Term Loan Facilities                            
Schedule of Equity Method Investments [Line Items]                            
Maximum borrowing capacity                           $ 350,000,000
Line of Credit | Variable-Rate Revolving Credit Facilities Due March 2023 | Revolving Credit Facility                            
Schedule of Equity Method Investments [Line Items]                            
Maximum borrowing capacity                           $ 35,000,000
Affiliated Entity | Financial | Lending Solutions Business                            
Schedule of Equity Method Investments [Line Items]                            
Processing and services                     30,000,000      
Affiliated Entity | Financial | Sales Revenue, Services, Net | Lending Solutions Business                            
Schedule of Equity Method Investments [Line Items]                            
Processing and services                     28,000,000      
Corporate and Other                            
Schedule of Equity Method Investments [Line Items]                            
Processing and services                     $ 43,000,000 $ 10,000,000 $ 6,000,000  
Corporate and Other | Lending Solutions Business                            
Schedule of Equity Method Investments [Line Items]                            
Gain on sale of businesses $ 227,000,000