Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net income	$ 446	$ 276	$ 1,048	$ 662
Other comprehensive income (loss):
Fair market value adjustment on cash flow hedges, net of income tax provision of $1 million, $2 million, $1 million and $0 million	3	6	4	1
Unrealized gain on defined benefit pension plans, net of income tax provision of $0 million	0	0	1	0
Foreign currency translation	(349)	(180)	(298)	(636)
Total other comprehensive loss	(344)	(170)	(287)	(623)
Comprehensive income	102	106	761	39
Less: net income attributable to noncontrolling interests and redeemable noncontrolling interests	18	12	47	4
Less: other comprehensive (loss) income attributable to noncontrolling interests	(18)	17	(25)	28
Comprehensive income attributable to Fiserv, Inc.	102	77	739	7
Cost of Services
Other comprehensive income (loss):
Reclassification adjustment for net realized (gains) losses on cash flow hedges	(2)	0	(6)	0
Interest Expense
Other comprehensive income (loss):
Reclassification adjustment for net realized (gains) losses on cash flow hedges	$ 4	$ 4	$ 12	$ 12