v2.4.0.8

Acquisitions and Divestitures (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended |  |  | 3 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |  | 0 Months Ended |  | 0 Months Ended |
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Mar. 31, 2014 | Dec. 31, 2013 | Apr. 30, 2013 | Mar. 31, 2014 3.875% senior unsecured notes due June 7, 2021 [Member] | Jun. 30, 2013 2011 Credit Facility [Member] | Sep. 30, 2011 2011 Credit Facility [Member] | Mar. 31, 2014 Customer relationships [Member] | Dec. 31, 2013 Customer relationships [Member] | Mar. 31, 2014 Technology [Member] | Dec. 31, 2013 Technology [Member] | Mar. 31, 2014 BWise [Member] | May 31, 2013 TR Businesses [Member] | May 31, 2013 TR Businesses [Member] Customer relationships [Member] | May 31, 2013 TR Businesses [Member] Technology [Member] | Apr. 30, 2013 TOM [Member] | Jun. 28, 2013 eSpeed [Member] | Jun. 28, 2013 eSpeed [Member] Customer relationships [Member] | Jun. 28, 2013 eSpeed [Member] Technology [Member] | Jun. 28, 2013 eSpeed [Member] Trade Names [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase consideration |  |  |  |  |  |  |  |  |  |  |  | $ 366 |  |  |  | $ 1,239 |  |  |
Net assets acquired |  |  |  |  |  |  |  |  |  |  |  | (37) |  |  |  | 5 |  |  |
Purchased Intangible Assets |  |  |  |  |  |  |  |  |  |  |  | 91 |  |  |  | 715 | 121 | 16 | 578
Percentage of acquired ownership interest |  |  |  |  |  |  |  |  |  |  | 28.00% |  |  |  | 25.00% | 100.00% |  |  |
Purchase consideration includes working capital adjustments |  |  |  |  |  |  |  |  |  |  |  | 390 |  |  |  |  |  |  |
Business acquisition, cash paid |  |  |  |  |  |  |  |  |  |  |  | 366 |  |  |  | 755 |  |  |
Business acquisition, working capital adjustments |  |  |  |  |  |  |  |  |  |  |  | 24 |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  |  |  |  |  |  |  |  | 91 | 89 | 2 |  |  |  |  |
Contingent future issuance of common stock, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 484 |  |  |
Contingent future issuance of common stock, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 992,247 |  |  |
Debt instrument, interest rate |  |  |  | 3.875% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Maturity Date |  |  |  | Jun. 07, 2021 |  | Sep. 19, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite Lived Intangible Assets Weighted Average Useful Life |  |  |  |  |  |  | 19 years | 19 years | 5 years | 5 years |  |  |  |  |  |  |  |  |
Purchased goodwill | 6,173 | 6,186 |  |  |  |  |  |  |  |  |  | 312 |  |  |  | 519 |  |  |
Option to acquire additional ownership percentage |  |  | 25.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncash Merger Related Costs | 18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Cost and Expense Disclosure, Operating | $8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, additional borrowings |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of expense (income) related to the increase (decrease) in reserve for business combination costs. Includes, but is not limited to, legal, accounting, and other costs incurred to consummate the merger. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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