Acquisitions Acquisitions (Purchase Price Schedule) (Details) (NYSE Euronext [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
	Nov. 13, 2013
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 2,742
Equity interest issued	8,333
Total purchase price	11,089
Common Stock [Member]
Business Acquisition [Line Items]
Equity interest issued	8,333
Unvested Restricted Common Stock and Vested Options [Member]
Business Acquisition [Line Items]
Equity interest issued	$ 14