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Goodwill and Acquired Intangible Assets (Finite-Lived and Indefinite-Lived Intangible Assets) (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | $ 1,632 | $ 1,679
Accumulated Amortization | (562) | (506)
Net Amount | 1,070 | 1,173
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-Lived Intangible Assets | 1,258 | 1,295
Total intangible assets | 2,890 | 2,974
Intangible assets, net | 2,328 | 2,468
Exchange and clearing registrations |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-Lived Intangible Assets | 1,257 | 1,257
Trade name |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-Lived Intangible Assets | 127 | 129
Licenses |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-Lived Intangible Assets | 52 | 52
Foreign currency translation adjustment |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-Lived Intangible Assets | (178) | (143)
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 50 | 65
Accumulated Amortization | (13) | (22)
Net Amount | $ 37 | $ 43
Weighted-Average Useful Life (in Years) | 9 years | 8 years
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | $ 1,708 | $ 1,708
Accumulated Amortization | (606) | (526)
Net Amount | $ 1,102 | $ 1,182
Weighted-Average Useful Life (in Years) | 18 years | 18 years
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | $ 17 | $ 17
Accumulated Amortization | (5) | (4)
Net Amount | $ 12 | $ 13
Weighted-Average Useful Life (in Years) | 8 years | 8 years
Foreign currency translation adjustment |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | $ (143) | $ (111)
Accumulated Amortization | 62 | 46
Net Amount | $ (81) | $ (65)

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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://fasb.org/us-gaap/role/ref/legacyRef -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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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