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Acquisitions and Dispositions - Narrative (Details) - USD ($) $ in Millions													2 Months Ended	3 Months Ended		12 Months Ended
	Dec. 20, 2022	Oct. 17, 2022	Sep. 30, 2022	Apr. 01, 2022	Nov. 22, 2021	Jun. 30, 2021	Jun. 14, 2021	May 04, 2021	Feb. 02, 2021	Jan. 22, 2021	Jul. 01, 2020	Feb. 18, 2020	May 11, 2020	Sep. 01, 2022	Jun. 14, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2020
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired																$ 988	$ 848	$ 139
Goodwill																36,811	36,433	36,322
Tax expense																551	363	196
Noncontrolling interest decrease																		$ 762
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]																		Gain (Loss) on Disposition of Assets
Net pre-tax gain																220	100	$ 0
Noncontrolling Interests
Business Acquisition [Line Items]
Noncontrolling interest decrease																		726
Additional Paid-In Capital
Business Acquisition [Line Items]
Noncontrolling interest decrease											$ 36							36
Banc of America Merchant Services | Corporate Joint Venture
Business Acquisition [Line Items]
Percentage of interest in joint venture											51.00%								51.00%
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business Acquisition [Line Items]
Consideration from sale of business												$ 578
Revaluation/Remeasurement gain																		176
Tax expense																		112
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Korea Operations
Business Acquisition [Line Items]
Consideration from sale of business			$ 50
Net proceeds from sale of businesses and other assets			43
Part noncash divestiture, amount of consideration received			7
Gain (loss) on disposition of business			(127)
Disposal group, including discontinued operation, goodwill			40
Disposal group, including discontinued operation, intangible assets			48
Disposal group, including discontinued operation, accumulated foreign currency translation loss			$ 56
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Fiserv Costa Rica, S.A.
Business Acquisition [Line Items]
Consideration from sale of business		$ 49
Gain (loss) on disposition of business		44
Tax expense		$ 8
Banc Of America Merchant Services Joint Venture | Bank Of America
Business Acquisition [Line Items]
Tax expense											$ 13
Pre-tax gain											36
Revaluation/Remeasurement gain											700
Additional consideration due from the Company											24
Banc Of America Merchant Services Joint Venture | Bank Of America | Noncontrolling Interests
Business Acquisition [Line Items]
Noncontrolling interest decrease											$ 726
Investment Services Business
Business Acquisition [Line Items]
Controlling interest sold (as a percent)												60.00%
Percentage of interest owned in affiliate												40.00%
Investment Services Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business Acquisition [Line Items]
Pre-tax gain on sale																		$ 428
InvestCloud Holdings, LLC
Business Acquisition [Line Items]
Tax expense																6
Capital contribution									$ 200
Net pre-tax gain																28
InvestCloud Holdings, LLC | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business Acquisition [Line Items]
Tax expense																8
Proceeds from sale of entire ownership interest						$ 466
Pre-tax gain on sale																33
Merchant One, Inc.
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired	$ 302
Acquired cash	1
Intangible assets	$ 178
Weighted-average useful life (in years)	10 years
Goodwill	$ 118
Other net assets	$ 6
Finxact, Inc.
Business Acquisition [Line Items]
Acquired cash				$ 27
Intangible assets				$ 105
Weighted-average useful life (in years)				6 years
Goodwill				$ 670
Other net assets				1
Payments for acquisitions of businesses				$ 645
Pre-tax gain from remeasurement																110
BentoBox
Business Acquisition [Line Items]
Acquired cash					$ 24
Intangible assets					$ 52
Weighted-average useful life (in years)					5 years
Goodwill					$ 266
Other net assets					23
Cash purchase price					$ 317
Measurement period adjustment, increase (decrease) in goodwill																62
Measurement period adjustment, intangible assets																(84)
Measurement period adjustment, recognized deferred tax liabilities																$ 22
Pineapple Payments
Business Acquisition [Line Items]
Acquired cash								$ 6
Intangible assets								$ 127
Weighted-average useful life (in years)								14 years
Goodwill								$ 79
Other net assets								7
Payments for acquisitions of businesses								207
Earn-out provisions estimated fair value								30
Goodwill, expected tax deductible amount								$ 59
Ondot
Business Acquisition [Line Items]
Acquired cash										$ 13
Intangible assets										$ 142
Weighted-average useful life (in years)										6 years
Goodwill										$ 173
Payments for acquisitions of businesses										$ 271
Pre-tax gain from remeasurement																	$ 12
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Intangible assets														$ 23
Weighted-average useful life (in years)														9 years
Goodwill														$ 22
Payments for acquisitions of businesses														44
Earn-out provisions estimated fair value														6
Other net assumed liabilities														1
Goodwill, expected tax deductible amount														$ 17
SpendLabs and Radius8
Business Acquisition [Line Items]
Intangible assets							$ 47								$ 47
Weighted-average useful life (in years)							7 years
Goodwill							$ 61								61
Payments for acquisitions of businesses															87
Earn-out provisions estimated fair value															4
Net assumed liabilities							7								7
Goodwill, expected tax deductible amount							$ 14								$ 14
MerchantPro, Bypass, and Inlet
Business Acquisition [Line Items]
Acquired cash													$ 2
Intangible assets													$ 81
Weighted-average useful life (in years)													11 years
Goodwill													$ 90
Payments for acquisitions of businesses													167
Earn-out provisions estimated fair value													45
Net assumed liabilities													4
Goodwill, expected tax deductible amount													$ 36

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