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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Net income $ 848 $ 752
Other comprehensive income (loss):    
Fair market value adjustment on derivatives 3 1
Tax impacts of derivatives (2) (1)
Unrealized (loss) gain on defined benefit pension plans 0 (84)
Tax impacts of defined benefit pension plans 0 21
Foreign currency translation 197 (133)
Tax impacts of foreign currency translation 40 (31)
Total other comprehensive income (loss) 243 (224)
Comprehensive income 1,091 528
Less: net (loss) income attributable to noncontrolling interests and redeemable noncontrolling interest (3) 17
Less: other comprehensive income (loss) attributable to noncontrolling interests 17 (13)
Comprehensive income attributable to Fiserv, Inc. 1,077 524
Foreign currency forward exchange contracts    
Other comprehensive income (loss):    
Reclassification adjustment for net realized (gains) losses on cash flow hedges 2 (1)
Treasury Lock    
Other comprehensive income (loss):    
Reclassification adjustment for net realized (gains) losses on cash flow hedges $ 3 $ 4