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Debt - Narrative (Details)
€ in Millions, $ in Millions
6 Months Ended
Jun. 30, 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 28.425%   31.695%      
Senior Notes            
Debt Instrument [Line Items]            
Debt instrument, face amount       $ 1,750   $ 2,000
Senior Notes | Fiserv Funding Unlimited Company            
Debt Instrument [Line Items]            
Debt instrument, face amount | €   € 2,175        
Senior Notes | 2.875% senior notes due June 2028 (Euro-denominated)            
Debt Instrument [Line Items]            
Outstanding borrowings $ 877   $ 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 $ 906   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 $ 760   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 $ 721   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 [Member]            
Debt Instrument [Line Items]            
Debt instrument, interest rate         2.75%  
Commercial Paper | U.S. dollar commercial paper notes            
Debt Instrument [Line Items]            
Debt maturities (in days) 397 days          
Outstanding borrowings $ 1,908   $ 221      
Weighted-Average Interest Rate 4.604%   4.534%      
Commercial Paper | Euro commercial paper notes            
Debt Instrument [Line Items]            
Debt maturities (in days) 183 days          
Outstanding borrowings $ 1,309   $ 1,239      
Weighted-Average Interest Rate 2.214%   3.115%      
Revolving credit facility | Line of Credit            
Debt Instrument [Line Items]            
Outstanding borrowings $ 61   $ 115      
Weighted-Average Interest Rate 5.43%   5.44%      
Maximum borrowing capacity $ 6,000          
Outstanding borrowings $ 61   $ 115      
Debt instrument, covenant, debt-to-EBITDA ratio 3.75