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Document and Entity Information
Mar. 15, 2025
Document And Entity Information [Line Items]  
Entity Registrant Name FISERV INC
Amendment Flag true
Entity Central Index Key 0000798354
Document Type 8-K/A
Document Period End Date Mar. 15, 2025
Entity Incorporation State Country Code WI
Entity File Number 1-38962
Entity Tax Identification Number 39-1506125
Entity Address, Address Line One 600 N. Vel R. Phillips Avenue
Entity Address, City or Town Milwaukee
Entity Address, State or Province WI
Entity Address, Postal Zip Code 53203
City Area Code (262)
Local Phone Number 879-5000
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Amendment Description Fiserv, Inc. (the “Company”) filed a Current Report on Form 8-K on March 17, 2025 (the “Original Form 8-K”) reporting, under Item 5.02, the appointment of Stephanie Cohen to its board of directors. Because Ms. Cohen was not appointed to serve on any committee of the board of directors at the time the Original Form 8-K was filed, disclosure of the committees of the board of directors on which she would serve was not included in accordance with Instruction 2 to Item 5.02. The Company hereby amends Item 5.02 of the Original Form 8-K to include information on the committee assignments. Other than providing the additional information, no other disclosure in the Original Form 8-K is amended by this Form 8-K/A.
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common Stock, par value $0.01 per share
Trading Symbol FI
Security Exchange Name NYSE
Senior Notes Due 2027 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 1.125% Senior Notes due 2027
Trading Symbol FI27
Security Exchange Name NYSE
M 1.625 Senior Notes Due 20304 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 1.625% Senior Notes due 2030
Trading Symbol FI30
Security Exchange Name NYSE
Senior Notes Due 2025 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 2.250% Senior Notes due 2025
Trading Symbol FI25
Security Exchange Name NYSE
A 3000 Senior Notes Due 2031 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 3.000% Senior Notes due 2031
Trading Symbol FI31
Security Exchange Name NYSE
A 4500 Senior Notes Due 2031 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 4.500% Senior Notes due 2031
Trading Symbol FI31A
Security Exchange Name NYSE
M 2.875 Senior Notes Due 20281 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 2.875% Senior Notes due 2028
Trading Symbol FI/28C
Security Exchange Name NYSE
M 3.500 Senior Notes Due 20322 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 3.500% Senior Notes due 2032
Trading Symbol FI/32
Security Exchange Name NYSE
M 4.000 Senior Notes Due 20363 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 4.000% Senior Notes due 2036
Trading Symbol FI/36
Security Exchange Name NYSE