|
Description of Business (Details)
In Millions, except Per Share data, unless otherwise specified |
6 Months Ended | 0 Months Ended | 3 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2014
USD ($)
|
Jun. 30, 2013
USD ($)
|
Jun. 30, 2014
Global Exchange [Member]
Entity
|
Jun. 30, 2014
Central Clearing House [Member]
Entity
|
Jun. 24, 2014
NYSE Euronext [Member]
USD ($)
transactions
|
Jun. 24, 2014
NYSE Euronext [Member]
EUR (€)
|
Jun. 24, 2014
Number of Shares, Total [Member]
NYSE Euronext [Member]
|
Jun. 24, 2014
Euronext IPO [Member]
NYSE Euronext [Member]
USD ($)
|
Jun. 24, 2014
Euronext IPO [Member]
NYSE Euronext [Member]
EUR (€)
|
Jun. 24, 2014
Cash Distribution [Member]
NYSE Euronext [Member]
USD ($)
|
Jun. 24, 2014
Shares Sold to Institutional Investors [Member]
NYSE Euronext [Member]
EUR (€)
|
Jun. 24, 2014
Shares Sold to Employees [Member]
NYSE Euronext [Member]
EUR (€)
|
Jun. 30, 2014
Private Placement [Member]
Entity
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| Business Acquisition [Line Items] | |||||||||||||
| Number of operating entities | 11 | 5 | |||||||||||
| Sale of Stock, Number of Shares Issued in Transaction | 65.8 | 42.2 | 42.2 | 23.4 | 0.2 | ||||||||
| Sale of Stock, Price Per Share, Euro | € 20 | € 19.20 | € 16 | ||||||||||
| Sale of Stock, Percentage of Ownership Sold | 94.00% | 94.00% | |||||||||||
| Sale of Stock, Number of Transactions | 3 | 3 | |||||||||||
| Proceeds from IPO | $ 28 | $ 0 | $ 1,900 | € 1,400 | $ 1,900 | € 1,400 | $ 220 | ||||||
| Sale of Stock, Percentage of Ownership after Transaction | 6.00% | 6.00% | |||||||||||
| Sale of Stock, Number of Proposed Companies to Sell in Private Placement | 3 | ||||||||||||
| Sale of Stock, Number of Shares Held after Transaction | 4.2 | 4.2 | |||||||||||
| Sale of Stock, Number of Companies Within Agreement to Sell | 2 | ||||||||||||