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Segment And Geographic Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Segment And Geographic Information [Abstract] |
Segment Information |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Year-Ended December 31,
﻿ |  | 2018 |  | 2017 |  | 2016
﻿ |  | (in millions)
﻿Net revenues |  |  |  |  |  |  |  |  |
﻿Electronic brokerage |  | $ | 1,842 |  | $ | 1,405 |  | $ | 1,239
﻿Market making |  |  | 76 |  |  | 86 |  |  | 190
﻿Corporate |  |  | (15) |  |  | 211 |  |  | (33)
﻿Total net revenues |  | $ | 1,903 |  | $ | 1,702 |  | $ | 1,396
﻿Income before income taxes |  |  |  |  |  |  |  |  |
﻿Electronic brokerage |  | $ | 1,177 |  | $ | 860 |  | $ | 756
﻿Market making |  |  | 34 |  |  | (27) |  |  | 44
﻿Corporate |  |  | (15) |  |  | 216 |  |  | (39)
﻿Total income before income taxes |  | $ | 1,196 |  | $ | 1,049 |  | $ | 761
﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | December 31,
﻿ |  | 2018 |  | 2017 |  | 2016
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | (in millions)
﻿Segment assets |  |  |  |  |  |  |  |  |
﻿Electronic brokerage |  | $ | 58,631 |  | $ | 58,787 |  | $ | 50,072
﻿Market making |  |  | 2,736 |  |  | 8,469 |  |  | 11,765
﻿Corporate |  |  | (820) |  |  | (6,094) |  |  | (7,164)
﻿Total assets |  | $ | 60,547 |  | $ | 61,162 |  | $ | 54,673
﻿
Schedule Of Total Net Revenues And Income Before Income Taxes By Geographic Area |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Year-Ended December 31,
﻿ |  | 2018 |  | 2017 |  | 2018
﻿ |  | (in millions)
﻿Net revenues |  |  |  |  |  |  |  |  |
﻿United States |  | $ | 1,501 |  | $ | 1,393 |  | $ | 1,046
﻿International |  |  | 402 |  |  | 309 |  |  | 350
﻿Total net revenues |  | $ | 1,903 |  | $ | 1,702 |  | $ | 1,396
﻿Income before income taxes |  |  |  |  |  |  |  |  |
﻿United States |  | $ | 1,029 |  | $ | 947 |  | $ | 632
﻿International |  |  | 167 |  |  | 102 |  |  | 129
﻿Total income before income taxes |  | $ | 1,196 |  | $ | 1,049 |  | $ | 761
﻿

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- Definition Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599 + Details
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