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Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2021
Dec. 31, 2020
Fiserv, Inc. Shareholders’ Equity:    
Preferred stock, shares authorized (in shares) 25,000,000.0 25,000,000.0
Preferred stock, shares issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 1,800,000,000.0 1,800,000,000.0
Common stock, shares issued (in shares) 789,600,000 789,600,000
Treasury stock (in shares) 123,000,000.0 120,500,000