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v3.25.3

Debt - Narrative (Details) € in Millions, $ in Millions | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 USD ($) | Aug. 12, 2025 USD ($) | Aug. 11, 2025 USD ($) | May 07, 2025 EUR (€) | Dec. 31, 2024 USD ($) | Aug. 31, 2024 USD ($) | Jul. 31, 2024 | Mar. 31, 2024 USD ($)
Foreign lines of credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Weighted-Average Interest Rate | 36.887% |  |  |  | 31.695% |  |  |
Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 2,000 |  |  | $ 1,750 |  | $ 2,000
Senior Notes | Fiserv Funding Unlimited Company |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  | € 2,175 |  |  |  |
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% |  |  |  |  |
Outstanding borrowings | $ 1,000 |  |  |  | $ 0 |  |  |
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% |  |  |  |  |
Outstanding borrowings | $ 1,000 |  |  |  | 0 |  |  |
Senior Notes | 2.875% senior notes due June 2028 (Euro-denominated) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Outstanding borrowings | $ 878 |  |  |  | 0 |  |  |
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% |  |  |  |
Senior Notes | 3.500% senior notes due June 2032 (Euro-denominated) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Outstanding borrowings | $ 907 |  |  |  | 0 |  |  |
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% |  |  |  |
Senior Notes | 4.0% Senior Notes Due June 2036 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Outstanding borrowings | $ 761 |  |  |  | 0 |  |  |
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% |  |  |  |
Senior Notes | 3.850% senior notes due June 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate | 3.85% |  |  |  |  |  |  |
Outstanding borrowings | $ 0 |  |  |  | 900 |  |  |
Senior Notes | 2.250% senior notes due July 2025 (British Pound-denominated) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate | 2.25% |  |  |  |  |  |  |
Outstanding borrowings | $ 0 |  |  |  | 661 |  |  |
Senior Notes | 4.750% senior notes due March 2030 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 850 |  |
Debt instrument, interest rate | 4.75% |  |  |  |  | 4.75% |  |
Outstanding borrowings | $ 850 |  |  |  | 850 |  |  |
Senior Notes | 5.150% senior notes due August 2034 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 900 |  |
Debt instrument, interest rate | 5.15% |  |  |  |  | 5.15% |  |
Outstanding borrowings | $ 900 |  |  |  | 900 |  |  |
Senior Notes | 5.150% senior notes due March 2027 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 750
Debt instrument, interest rate | 5.15% |  |  |  |  |  |  | 5.15%
Outstanding borrowings | $ 750 |  |  |  | 750 |  |  |
Senior Notes | 5.350% senior notes due March 2031 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 500
Debt instrument, interest rate | 5.35% |  |  |  |  |  |  | 5.35%
Outstanding borrowings | $ 500 |  |  |  | 500 |  |  |
Senior Notes | 5.450% senior notes due March 2034 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 750
Debt instrument, interest rate | 5.45% |  |  |  |  |  |  | 5.45%
Outstanding borrowings | $ 750 |  |  |  | 750 |  |  |
Senior Notes | 2.75% Senior Notes Due July 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  | 2.75% |
Senior Notes | 3.200% senior notes due July 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate | 3.20% |  |  |  |  |  |  |
Outstanding borrowings | $ 2,000 |  |  |  | 2,000 |  |  |
Commercial Paper | U.S. dollar commercial paper notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maturities (in days) | 397 days |  |  |  |  |  |  |
Outstanding borrowings | $ 1,238 |  |  |  | $ 221 |  |  |
Weighted-Average Interest Rate | 4.301% |  |  |  | 4.534% |  |  |
Commercial Paper | Euro commercial paper notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt maturities (in days) | 183 days |  |  |  |  |  |  |
Outstanding borrowings | $ 1,310 |  |  |  | $ 1,239 |  |  |
Weighted-Average Interest Rate | 2.135% |  |  |  | 3.115% |  |  |
Revolving credit facility | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Outstanding borrowings | $ 0 |  |  |  | $ 115 |  |  |
Weighted-Average Interest Rate |  |  |  |  | 5.44% |  |  |
Maximum borrowing capacity |  | $ 8,000 |  |  |  |  |  |
Outstanding borrowings | $ 0 |  |  |  | $ 115 |  |  |
Debt instrument, covenant, debt-to-EBITDA ratio | 3.75 |  |  |  |  |  |  |

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