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Goodwill and Acquired Intangible Assets (Finite-Lived and Indefinite-Lived Intangible Assets) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Finite-Lived Intangible Assets |  |
Total Finite-Lived Intangible Assets, Gross Amount | $ 1,279 | $ 944
Accumulated Amortization | (436) | (371)
Total | 843 | 573
Indefinite-Lived Intangible Assets |  |
Total Indefinite-Lived Intangible Assets, Net Amount | 1,251 | 1,386
Total Intangible Assets, Gross Amount | 2,530 | 2,330
Total Intangible Assets, Net Amount | 2,094 | 1,959
Exchange and clearing registrations |  |
Indefinite-Lived Intangible Assets |  |
Total Indefinite-Lived Intangible Assets, Net Amount | 1,257 | 790
Trade names |  |
Indefinite-Lived Intangible Assets |  |
Total Indefinite-Lived Intangible Assets, Net Amount | 130 | 700
Licenses |  |
Indefinite-Lived Intangible Assets |  |
Total Indefinite-Lived Intangible Assets, Net Amount | 52 | 51
Foreign currency translation adjustment |  |
Indefinite-Lived Intangible Assets |  |
Total Indefinite-Lived Intangible Assets, Net Amount | (188) | (155)
Technology |  |
Finite-Lived Intangible Assets |  |
Total Finite-Lived Intangible Assets, Gross Amount | 38 | 39
Accumulated Amortization | (24) | (23)
Total | $ 14 | $ 16
Weighted-Average Useful Life (in Years) | 5 years | 5 years
Customer relationships |  |
Finite-Lived Intangible Assets |  |
Total Finite-Lived Intangible Assets, Gross Amount | $ 1,394 | $ 1,038
Accumulated Amortization | (464) | (387)
Total | $ 930 | $ 651
Weighted-Average Useful Life (in Years) | 18 years | 20 years
Other |  |
Finite-Lived Intangible Assets |  |
Total Finite-Lived Intangible Assets, Gross Amount | $ 7 | $ 5
Accumulated Amortization | (6) | (4)
Total | $ 1 | $ 1
Weighted-Average Useful Life (in Years) | 6 years | 9 years
Foreign currency translation adjustment |  |
Finite-Lived Intangible Assets |  |
Total Finite-Lived Intangible Assets, Gross Amount | $ (160) | $ (138)
Accumulated Amortization | 58 | 43
Total | $ (102) | $ (95)

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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