Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net income	[1]	$ 1,403	$ 975	$ 914
Other comprehensive income (loss):
Fair market value adjustment on cash flow hedges, net of income tax (provision) benefit of ($2 million), ($2 million) and $46 million		6	5	(134)
Unrealized gains (losses) on defined benefit pension plans, net of income tax (provision) benefit of ($17 million), $2 million and $1 million		50	(6)	(4)
Foreign currency translation, net of income tax (see Note 14)		(461)	(186)	8
Total other comprehensive loss		(397)	(172)	(121)
Comprehensive income		1,006	803	793
Less: net income attributable to noncontrolling interests and redeemable noncontrolling interests		69	17	21
Less: other comprehensive (loss) income attributable to noncontrolling interests		(39)	35	(8)
Comprehensive income attributable to Fiserv, Inc.		976	751	780
Cost of Processing and Services
Other comprehensive income (loss):
Reclassification adjustment for net realized (gains) losses on cash flow hedges		(8)	(1)	(1)
Interest Expense
Other comprehensive income (loss):
Reclassification adjustment for net realized (gains) losses on cash flow hedges		$ 16	$ 16	$ 10

[1] The company revised the consolidated statements of cash flows presentation to include cash and cash equivalents within settlement assets as a component of total cash and cash equivalents. The company revised the 2020 and 2019 presentation for comparable purposes. Additional information is included in Note 1.