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Related Party Transactions - (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended
	Jul. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Corporate joint venture
Related Party Transaction
Ownership percentage of the Brazilian venture		51.00%
Noncontrolling interest in joint venture		$ 109
Corporate joint venture | Contract-based intangible assets
Related Party Transaction
Finite-lived intangible assets, net		61
Capco Consulting Business
Related Party Transaction
Ownership percentage	40.00%
Banco Bradesco
Related Party Transaction
Processing and services revenue		87	$ 80
Banco Bradesco | Favorable (unfavorable) currency impact
Related Party Transaction
Processing and services revenue		$ (3)
Capco Consulting Business | Disposal group, disposed of by sale, not discontinued operations
Related Party Transaction
Ownership percentage by noncontrolling owners	60.00%

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Joint Venture, Ownership Percentage

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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Carrying amount of the equity interests owned by noncontrolling shareholders, partners, or other equity holders in joint ventures included in the entity's consolidated financial statements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4568740-111683

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.1(c))
-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999

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