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Acquisitions and Divestitures (Schedule Of Acquisition) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013 | Jun. 28, 2013 eSpeed [Member] | May 31, 2013 TR Businesses [Member]
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Business Acquisition [Line Items] |  |  |  |
Purchase consideration |  |  | $ 1,239 | $ 366
Net assets acquired |  |  | 5 | (37)
Purchased Intangible Assets |  |  | 715 | 91
Goodwill | $ 6,173 | $ 6,186 | $ 519 | $ 312

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