XML 50 R39.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Financial Assets And Financial Liabilities (Fair Value Table) (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | $ 12,063 | $ 15,214
Total financial instruments owned, at fair value | 3,823 | 3,420
Total Financial Assets at Fair Value | 15,886 | 18,634
Financial instruments sold, not yet purchased, at fair value | 2,459 | 2,617
Total Financial Liabilities at Fair Value | 2,459 | 2,617
Common Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 1,884 | 1,650
Financial instruments sold, not yet purchased, at fair value | 1,399 | 1,565
Options owned [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 1,578 | 1,156
Financial instruments sold, not yet purchased, at fair value | 1,058 | 1,042
Warrants And Discount Certificates [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 57 | 81
Financial instruments sold, not yet purchased, at fair value | 1 | 1
U.S. And Foreign Government Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 296 | 527
Corporate And Municipal Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 3 | 3
Currency Forward Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 5 | 3
Financial instruments sold, not yet purchased, at fair value | 1 | 9
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities segregated for regulatory purposes | 12,063 | 15,214
Total financial instruments owned, at fair value | 3,815 | 3,414
Total Financial Assets at Fair Value | 15,878 | 18,628
Financial instruments sold, not yet purchased, at fair value | 2,457 | 2,608
Total Financial Liabilities at Fair Value | 2,457 | 2,608
Level 1 | Common Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 1,884 | 1,650
Financial instruments sold, not yet purchased, at fair value | 1,398 | 1,565
Level 1 | Options owned [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 1,578 | 1,156
Financial instruments sold, not yet purchased, at fair value | 1,058 | 1,042
Level 1 | Warrants And Discount Certificates [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 57 | 81
Financial instruments sold, not yet purchased, at fair value | 1 | 1
Level 1 | U.S. And Foreign Government Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 296 | 527
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 8 | 6
Total Financial Assets at Fair Value | 8 | 6
Financial instruments sold, not yet purchased, at fair value | 1 | 9
Total Financial Liabilities at Fair Value | 1 | 9
Level 2 | Corporate And Municipal Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 3 | 3
Level 2 | Currency Forward Contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total financial instruments owned, at fair value | 5 | 3
Financial instruments sold, not yet purchased, at fair value | 1 | $ 9
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments sold, not yet purchased, at fair value | 1 |
Total Financial Liabilities at Fair Value | 1 |
Level 3 | Common Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments sold, not yet purchased, at fair value | $ 1 |

X
- Definition Aggregate fair value of financial assets as of the balance sheet date including pledged and unpledged trading securities and securities held for investment purposes. + References No definition available. + Details
Name: | ibkr_FinancialInstrumentsTradingNonTradingAtFairValue
Namespace Prefix: | ibkr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of securities deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations and the Commodity Exchange Act regulations in addition to other regulations. + References No definition available. + Details
Name: | ibkr_SecuritiesSegregatedUnderRegulations
Namespace Prefix: | ibkr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Total Financial Liabilities at Fair Value + References No definition available. + Details
Name: | ibkr_TotalFinancialLiabilitiesAtFairValue
Namespace Prefix: | ibkr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
Name: | us-gaap_FinancialInstrumentsOwnedAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of obligations incurred from short sales. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35711043&loc=d3e42429-110968 + Details
Name: | us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_EligibleItemOrGroupForFairValueOptionAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EligibleItemOrGroupForFairValueOptionAxis=us-gaap_StockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EligibleItemOrGroupForFairValueOptionAxis=ibkr_WarrantsAndDiscountCertificatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EligibleItemOrGroupForFairValueOptionAxis=ibkr_FinancialInstrumentsOwnedUSAndForeignGovernmentObligationsAtFairValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EligibleItemOrGroupForFairValueOptionAxis=ibkr_CorporateMunicipalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EligibleItemOrGroupForFairValueOptionAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |