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Acquisitions and Dispositions - Gross Carrying Amount and Weighted-Average Useful Life Allocated to Intangible Assets (Details) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
	Jul. 29, 2019	Sep. 30, 2019	Dec. 31, 2017
First Data
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 16,424
Weighted-Average Useful Life	14 years
First Data | Customer relationships, net
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 13,613
Weighted-Average Useful Life	15 years
First Data | Acquired software and technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,321
Weighted-Average Useful Life	7 years
First Data | Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 490
Weighted-Average Useful Life	9 years
Elan Financial Services
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 373
Weighted-Average Useful Life		15 years
Elan Financial Services | Customer relationships, net
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 370
Weighted-Average Useful Life		15 years
Elan Financial Services | Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 3
Weighted-Average Useful Life		8 years
Series of Individually Immaterial Business Acquisitions
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount			$ 163
Weighted-Average Useful Life			12 years
Series of Individually Immaterial Business Acquisitions | Customer relationships, net
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount			$ 92
Weighted-Average Useful Life			15 years
Series of Individually Immaterial Business Acquisitions | Acquired software and technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount			$ 71
Weighted-Average Useful Life			7 years

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=116868840&loc=d3e2207-128464

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-Section 50
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-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

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