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Acquisitions and Dispositions - Pro Forma Combined Financial Information (Details) - First Data - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Total revenue | $ 15,775 | $ 15,284
Net income | 1,520 | 1,125
Net income attributable to Fiserv, Inc. | $ 1,457 | $ 1,040
Net income per share attributable to Fiserv, Inc.: |  |
Net income per share attributable to Fiserv, Inc., Basic (in dollars per share) | $ 2.14 | $ 1.50
Net income per share attributable to Fiserv, Inc., Diluted (in dollars per share) | $ 2.10 | $ 1.47

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