Business Acquisition, Total Percentage of Voting Interests Acquired

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- Definition

Business Combination, Exchange Rate

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- Definition

Business Combination, Number of Financial Services Firms

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- Definition

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.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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- Definition

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

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- Definition

The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Acquisitions and Investments (Details) € in Millions, $ in Millions					6 Months Ended	12 Months Ended
	Jul. 23, 2018 USD ($)	Feb. 21, 2018 USD ($)	Feb. 21, 2018 EUR (€)	Jan. 02, 2018 USD ($) service	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)
Business Acquisition [Line Items]
Goodwill					$ 12,484	$ 12,216
Virtu BondPoint
Business Acquisition [Line Items]
Percentage of voting interests acquired				100.00%
Cash consideration				$ 400
Number of financial services firms (more than) \| service				500
Identifiable intangible assets				$ 130
Goodwill				267
Virtu BondPoint \| Customer Relationships
Business Acquisition [Line Items]
Identifiable intangible assets				$ 123
Useful life of intangible asset				15 years
Virtu BondPoint \| Developed Technology
Business Acquisition [Line Items]
Identifiable intangible assets				$ 7
Useful life of intangible asset				3 years
Euroclear
Business Acquisition [Line Items]
Percentage of voting interests acquired		5.10%	5.10%		5.10%	4.70%
Cash payment to acquire business		$ 304	€ 246		$ 631	$ 327	€ 276
Exchange rate		1.2368	1.2368
Total percentage of voting interests acquired					9.80%
Subsequent Event \| TMC Bonds, LLC
Business Acquisition [Line Items]
Cash payment to acquire business	$ 701
Cash held on the date of acquisition	$ 14