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Debt - Narrative (Details) € in Millions, $ in Millions |  |  | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2026 USD ($) | Jun. 23, 2026 USD ($) | Jun. 30, 2026 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2026 USD ($) | Jun. 30, 2025 USD ($) | Jun. 23, 2026 EUR (€) | Dec. 31, 2025 USD ($) | Aug. 12, 2025 USD ($) | Aug. 11, 2025 USD ($) | Jul. 31, 2025 | May 07, 2025 EUR (€)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of senior debt |  | $ 1,200 |  |  |  |  |  |  |  |  |  |
Gain on early debt extinguishment |  |  | $ 154 | $ 0 | $ 154 | $ 0 |  |  |  |  |  |
Foreign lines of credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted-Average Interest Rate |  |  | 17.401% |  | 17.401% |  |  | 27.727% |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | € 1,000 |  |  | $ 2,000 |  |
Debt instrument, interest rate, increase (decrease) due to credit rating below investment grade |  |  |  |  | 2.00% |  |  |  |  |  |  |
Senior Notes | Fiserv Funding Unlimited Company |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  |  |  |  |  |  |  |  | € 2,175
Senior Notes | 3.750% senior notes due October 2030 (Euro-denominated) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  |  |  | € 500 |  |  |  |  |
Debt instrument, interest rate |  | 3.75% | 3.75% |  | 3.75% |  | 3.75% |  |  |  |  |
Outstanding borrowings |  |  | $ 569 |  | $ 569 |  |  | $ 0 |  |  |  |
Senior Notes | 4.250% senior notes due June 2034 (Euro-denominated) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  |  |  | € 500 |  |  |  |  |
Debt instrument, interest rate |  | 4.25% | 4.25% |  | 4.25% |  | 4.25% |  |  |  |  |
Outstanding borrowings |  |  | $ 569 |  | $ 569 |  |  | 0 |  |  |  |
Senior Notes | 5.150% senior notes due March 2027 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  | 5.15% | 5.15% |  | 5.15% |  | 5.15% |  |  |  |  |
Outstanding borrowings |  |  | $ 234 |  | $ 234 |  |  | 750 |  |  |  |
Senior Notes | 4.400% senior notes due July 2049 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 28 |  | $ 28 |  |  |  |  |  |  |
Debt instrument, interest rate |  | 4.40% | 4.40% |  | 4.40% |  | 4.40% |  |  |  |  |
Repayments of senior debt |  |  | $ 23 |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  | $ 1,156 |  | $ 1,156 |  |  | 2,000 |  |  |  |
Senior Notes | 4.400% senior notes due July 2049 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 47 |  |  |  |  |  |  |  |  |  |  |
Repayments of senior debt | $ 38 |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 5.150% Senior Notes Due March 2027 and 4.400% Senior Notes Due July 2049 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 1,300 |  |  |  |  |  |  |  |  |  |
Senior Notes | 4.550% senior notes due February 2031 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 1,000 |  |
Debt instrument, interest rate |  |  | 4.55% |  | 4.55% |  |  |  |  | 4.55% |  |
Outstanding borrowings |  |  | $ 1,000 |  | $ 1,000 |  |  | 1,000 |  |  |  |
Senior Notes | 5.250% senior notes due August 2035 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 1,000 |  |
Debt instrument, interest rate |  |  | 5.25% |  | 5.25% |  |  |  |  | 5.25% |  |
Outstanding borrowings |  |  | $ 1,000 |  | $ 1,000 |  |  | 1,000 |  |  |  |
Senior Notes | 2.875% senior notes due June 2028 (Euro-denominated) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  | $ 854 |  | $ 854 |  |  | 883 |  |  |  |
Senior Notes | 2.875% senior notes due June 2028 (Euro-denominated) | Fiserv Funding Unlimited Company |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  |  |  |  |  |  |  |  | € 750
Debt instrument, interest rate |  |  | 2.875% |  | 2.875% |  |  |  |  |  |  | 2.875%
Senior Notes | 3.500% senior notes due June 2032 (Euro-denominated) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  | $ 882 |  | $ 882 |  |  | 912 |  |  |  |
Senior Notes | 3.500% senior notes due June 2032 (Euro-denominated) | Fiserv Funding Unlimited Company |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  |  |  |  |  |  |  |  | € 775
Debt instrument, interest rate |  |  | 3.50% |  | 3.50% |  |  |  |  |  |  | 3.50%
Senior Notes | 4.0% Senior Notes Due June 2036 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  | $ 740 |  | $ 740 |  |  | 765 |  |  |  |
Senior Notes | 4.0% Senior Notes Due June 2036 | Fiserv Funding Unlimited Company |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  |  |  |  |  |  |  |  | € 650
Debt instrument, interest rate |  |  | 4.00% |  | 4.00% |  |  |  |  |  |  | 4.00%
Senior Notes | 3.85% Senior Notes Due June 2025 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  |  |  | 3.85%
Senior Notes | 2.25% Senior Notes Due July 2025 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  |  | 2.25% | 2.25%
Senior Notes | 4.750% senior notes due March 2030 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  | 4.75% |  | 4.75% |  |  |  |  |  |  |
Outstanding borrowings |  |  | $ 850 |  | $ 850 |  |  | 850 |  |  |  |
Senior Notes | 5.150% senior notes due August 2034 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  | 5.15% |  | 5.15% |  |  |  |  |  |  |
Outstanding borrowings |  |  | $ 900 |  | $ 900 |  |  | 900 |  |  |  |
Senior Notes | 5.350% senior notes due March 2031 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  | 5.35% |  | 5.35% |  |  |  |  |  |  |
Outstanding borrowings |  |  | $ 500 |  | $ 500 |  |  | 500 |  |  |  |
Senior Notes | 5.450% senior notes due March 2034 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  | 5.45% |  | 5.45% |  |  |  |  |  |  |
Outstanding borrowings |  |  | $ 750 |  | $ 750 |  |  | 750 |  |  |  |
Senior Notes | 3.200% senior notes due July 2026 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  | 3.20% |  | 3.20% |  |  |  |  |  |  |
Outstanding borrowings |  |  | $ 2,000 |  | $ 2,000 |  |  | 2,000 |  |  |  |
Commercial Paper | U.S. dollar commercial paper notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt maturities (in days) |  |  |  |  | 397 days |  |  |  |  |  |  |
Outstanding borrowings |  |  | 0 |  | $ 0 |  |  | $ 326 |  |  |  |
Weighted-Average Interest Rate |  |  |  |  |  |  |  | 3.851% |  |  |  |
Commercial Paper | Euro commercial paper notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt maturities (in days) |  |  |  |  | 183 days |  |  |  |  |  |  |
Outstanding borrowings |  |  | $ 548 |  | $ 548 |  |  | $ 839 |  |  |  |
Weighted-Average Interest Rate |  |  | 2.493% |  | 2.493% |  |  | 2.21% |  |  |  |
Revolving credit facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  | $ 0 |  | $ 0 |  |  | $ 188 |  |  |  |
Weighted-Average Interest Rate |  |  |  |  |  |  |  | 4.685% |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 8,000 |  |  |
Outstanding borrowings |  |  | $ 0 |  | $ 0 |  |  | $ 188 |  |  |  |
Debt instrument, covenant, debt-to-EBITDA ratio |  |  | 3.75 |  | 3.75 |  |  |  |  |  |  |

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