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Business Segment Information - Schedule of Segment Reporting Information (Details) - USD ($) $ in Millions			3 Months Ended								12 Months Ended
		Mar. 29, 2018	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenue			$ 4,045	$ 3,128	$ 1,512	$ 1,502	$ 1,551	$ 1,412	$ 1,420	$ 1,440	$ 10,187	$ 5,823	$ 5,696
Operating income			478	374	384	373	431	356	358	608	1,609	1,753	1,532
Capital expenditures											721	360	287
Depreciation and amortization expense											1,778	556	444
Gain on sale of businesses			$ 5	$ 0	$ 0	$ 10	$ 0	$ (2)	$ (3)	$ 232	15	227	10
Operating segments | First Data
Segment Reporting Information [Line Items]
Revenue											4,078	0	0
Operating income											1,031	0	0
Capital expenditures											250	0	0
Depreciation and amortization expense											421	0	0
Operating segments | Payments
Segment Reporting Information [Line Items]
Revenue											3,744	3,467	3,234
Operating income											1,252	1,122	1,034
Capital expenditures											265	239	182
Depreciation and amortization expense											253	225	169
Operating segments | Financial
Segment Reporting Information [Line Items]
Revenue											2,407	2,395	2,530
Operating income											805	798	849
Capital expenditures											131	115	95
Depreciation and amortization expense											149	145	92
Corporate and Other
Segment Reporting Information [Line Items]
Revenue											(42)	(39)	(68)
Operating income											(1,479)	(167)	(351)
Capital expenditures											75	6	10
Depreciation and amortization expense											955	186	183
Lending Solutions Business | Financial
Segment Reporting Information [Line Items]
Gain on sale of businesses											10
Lending Solutions Business | Corporate and Other
Segment Reporting Information [Line Items]
Gain on sale of businesses												227
Fiserv Automotive Solutions, LLC | Financial
Segment Reporting Information [Line Items]
Controlling interest sold (as a percent)		55.00%
Processing and services revenue
Segment Reporting Information [Line Items]
Revenue	[1]										8,573	4,975	4,833
Processing and services revenue | Operating segments | First Data
Segment Reporting Information [Line Items]
Revenue											3,291	0	0
Processing and services revenue | Operating segments | Payments
Segment Reporting Information [Line Items]
Revenue											2,993	2,728	2,476
Processing and services revenue | Operating segments | Financial
Segment Reporting Information [Line Items]
Revenue											2,240	2,204	2,347
Processing and services revenue | Corporate and Other
Segment Reporting Information [Line Items]
Revenue											49	43	10
Product revenue
Segment Reporting Information [Line Items]
Revenue											1,614	848	863
Product revenue | Operating segments | First Data
Segment Reporting Information [Line Items]
Revenue											787	0	0
Product revenue | Operating segments | Payments
Segment Reporting Information [Line Items]
Revenue											751	739	758
Product revenue | Operating segments | Financial
Segment Reporting Information [Line Items]
Revenue											167	191	183
Product revenue | Corporate and Other
Segment Reporting Information [Line Items]
Revenue											$ (91)	$ (82)	$ (78)
[1] Includes processing and other fees charged to related party investments accounted for under the equity method of $112 million, $28 million and $0 million for the years ended December 31, 2019, 2018 and 2017, respectively (see Notes 9 and 20).

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