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Goodwill and Other Intangible Assets (Other Intangible Rollforward) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Finite-lived Intangible Assets [Roll Forward]  
Other intangible assets, beginning balance $ 9,404
Acquisition 39
Foreign currency translation 9
De-consolidation of Euronext and reclassification of other intangible assets relating to discontinued operations (Note 13) 59
Other activity, net (82)
Amortization of other intangible assets (1,472)
Other intangible assets, ending balance $ 7,957