Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net income	$ 969	$ 493	$ 2,240	$ 1,784
Other comprehensive income (loss):
Fair market value adjustment on derivatives	5	(6)	14	(15)
Tax impacts of derivatives	(3)	1	(7)	0
Unrealized gain (loss) on defined benefit pension plans	0	1	3	(3)
Tax impacts of defined benefit pension plans	0	0	(1)	1
Foreign currency translation	(261)	(550)	(11)	(765)
Reclassification adjustment for accumulated foreign currency translation impacts from the sale of foreign entities included in net (gain) loss on sale of businesses and other assets	10	56	10	56
Tax impacts of foreign currency translation	(42)	(89)	(2)	(172)
Total other comprehensive income (loss)	(283)	(582)	21	(883)
Comprehensive income (loss)	686	(89)	2,261	901
Less: net income attributable to noncontrolling interests and redeemable noncontrolling interests	17	12	42	36
Less: other comprehensive loss attributable to noncontrolling interests	(17)	(48)	(2)	(89)
Comprehensive income (loss) attributable to Fiserv, Inc.	686	(53)	2,221	954
Cost of Services
Other comprehensive income (loss):
Reclassification adjustment for net realized (gains) losses on cash flow hedges	4	1	4	0
Interest Expense
Other comprehensive income (loss):
Reclassification adjustment for net realized (gains) losses on cash flow hedges	$ 4	$ 4	$ 11	$ 15