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Acquisitions and Dispositions - Pro Forma Combined Financial Information (Details) - First Data $ / shares in Units, $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($) $ / shares
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |
Total revenue | $ 3,809
Net loss | (18)
Net loss attributable to Fiserv, Inc. | $ (42)
Net loss per share attributable to Fiserv, Inc., Basic (in dollars per share) | $ / shares | $ (0.06)
Net loss per share attributable to Fiserv, Inc., Diluted (in dollars per share) | $ / shares | $ (0.06)

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