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Business Segments (Narrative) (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of business segments | segment |  | 4 |
Increase (decrease) in total assets |  | $ 2,289 | $ (210)
Rebranding of Trade Name |  |  |
Segment Reporting Information [Line Items] |  |  |
Non-cash intangible asset impairment charges |  | $ 578 | $ 119
Trade name | eSpeed | Subsequent Event |  |  |
Segment Reporting Information [Line Items] |  |  |
Asset impairment charges | $ 578 |  |

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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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