Organization Of Business	12 Months Ended
Dec. 31, 2019
Organization Of Business [Abstract]
Organization Of Business	1. Organization of Business Interactive Brokers Group, Inc. (“IBG, Inc.”) is a Delaware holding company whose primary asset is its ownership of approximately 18.5% of the membership interests of IBG LLC, which, in turn, owns operating subsidiaries (collectively, “IBG LLC”). IBG, Inc. together with IBG LLC and its consolidated subsidiaries (collectively, “the Company”), is an automated global electronic broker specializing in executing and clearing trades in securities, futures, foreign exchange instruments, bonds and mutual funds on more than 135 electronic exchanges and market centers around the world and offering custody, prime brokerage, securities and margin lending services to customers. In the United States of America (“U.S.”), the Company conducts its business primarily from its headquarters in Greenwich, Connecticut and from Chicago, Illinois. Abroad, the Company conducts its business through offices located in Canada, the United Kingdom, Luxembourg, Switzerland, India, China (Hong Kong and Shanghai), Japan and Australia. As of December 31, 2019, the Company had 1,643 employees worldwide. IBG LLC is a Connecticut limited liability company that conducts its business through its significant operating subsidiaries: Interactive Brokers LLC (“IB LLC”); Interactive Brokers Canada Inc. (“IBC”); Interactive Brokers (U.K.) Limited (“IBUK”); IBKR Europe S.a.r.l. (“IBEU”); IBKR Financial Services AG (“IBKRFS”); Interactive Brokers (India) Private Limited (“IBI”), Interactive Brokers Hong Kong Limited (“IBHK”), Interactive Brokers Securities Japan, Inc. (“IBSJ”) and Interactive Brokers Australia Pty Limited (“IBA”). The Company operates in two business segments: electronic brokerage and market making, both supported by corporate. The electronic brokerage business provides electronic execution and clearing services to customers worldwide. The market making business currently consists of customer facilitation in products such as CFDs, ETFs and single stock futures, as well as exchange traded market making activities in a few select markets outside the U.S. (See Note 2 – Discontinued Operations and Costs Associated with Exit or Disposal Activities). Corporate enables the Company to operate cohesively and effectively by providing support via development services and control functions to the business segments and also by executing the Company’s currency diversification strategy. Certain of the operating subsidiaries are members of various securities and commodities exchanges in North America, Europe and the Asia/Pacific region and are subject to regulatory capital and other requirements (see Note 16). IB LLC, IBC, IBUK, IBEU, IBI, IBHK, IBSJ and IBA carry securities accounts for customers or perform custodial functions relating to customer securities.

Organization Of Business

12 Months Ended

Dec. 31, 2019

1. Organization of Business

Interactive Brokers Group, Inc. (“IBG, Inc.”) is a Delaware holding company whose primary asset is its ownership of approximately 18.5% of the membership interests of IBG LLC, which, in turn, owns operating subsidiaries (collectively, “IBG LLC”). IBG, Inc. together with IBG LLC and its consolidated subsidiaries (collectively, “the Company”), is an automated global electronic broker specializing in executing and clearing trades in securities, futures, foreign exchange instruments, bonds and mutual funds on more than 135 electronic exchanges and market centers around the world and offering custody, prime brokerage, securities and margin lending services to customers. In the United States of America (“U.S.”), the Company conducts its business primarily from its headquarters in Greenwich, Connecticut and from Chicago, Illinois. Abroad, the Company conducts its business through offices located in Canada, the United Kingdom, Luxembourg, Switzerland, India, China (Hong Kong and Shanghai), Japan and Australia. As of December 31, 2019, the Company had 1,643 employees worldwide.

IBG LLC is a Connecticut limited liability company that conducts its business through its significant operating subsidiaries: Interactive Brokers LLC (“IB LLC”); Interactive Brokers Canada Inc. (“IBC”); Interactive Brokers (U.K.) Limited (“IBUK”); IBKR Europe S.a.r.l. (“IBEU”); IBKR Financial Services AG (“IBKRFS”); Interactive Brokers (India) Private Limited (“IBI”), Interactive Brokers Hong Kong Limited (“IBHK”), Interactive Brokers Securities Japan, Inc. (“IBSJ”) and Interactive Brokers Australia Pty Limited (“IBA”).

The Company operates in two business segments: electronic brokerage and market making, both supported by corporate. The electronic brokerage business provides electronic execution and clearing services to customers worldwide. The market making business currently consists of customer facilitation in products such as CFDs, ETFs and single stock futures, as well as exchange traded market making activities in a few select markets outside the U.S. (See Note 2 – Discontinued Operations and Costs Associated with Exit or Disposal Activities). Corporate enables the Company to operate cohesively and effectively by providing support via development services and control functions to the business segments and also by executing the Company’s currency diversification strategy.

Certain of the operating subsidiaries are members of various securities and commodities exchanges in North America, Europe and the Asia/Pacific region and are subject to regulatory capital and other requirements (see Note 16). IB LLC, IBC, IBUK, IBEU, IBI, IBHK, IBSJ and IBA carry securities accounts for customers or perform custodial functions relating to customer securities.