XML 41 R26.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Comprehensive Income (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Comprehensive Income Detail [Abstract] |
Comprehensive Income Table |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |
﻿ |  | Year-Ended December 31,
﻿ |  | 2017 |  | 2016 |  | 2015
﻿ |  | (in millions, except share or per share amounts)
﻿ |  |  |  |  |  |  |  |  |
﻿Comprehensive income available for common stockholders |  | $ | 87 |  | $ | 80 |  | $ | 39
﻿ |  |  |  |  |  |  |  |  |
﻿Earnings per share on comprehensive income |  |  |  |  |  |  |  |  |
﻿Basic |  | $ | 1.24 |  | $ | 1.21 |  | $ | 0.64
﻿Diluted |  | $ | 1.22 |  | $ | 1.19 |  | $ | 0.62
﻿Weighted average common shares outstanding |  |  |  |  |  |  |  |  |
﻿Basic |  |  | 69,926,933 |  |  | 66,013,247 |  |  | 61,043,071
﻿Diluted |  |  | 70,904,921 |  |  | 67,299,413 |  |  | 62,509,796
﻿

X
- References No definition available. + Details
Name: | ibkr_ComprehensiveIncomeDetailAbstract
Namespace Prefix: | ibkr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e526-108580 + Details
Name: | us-gaap_ScheduleOfComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration