Senior Notes Payable	9 Months Ended
Sep. 30, 2021
Senior Notes Payable [Abstract]
Senior Notes Payable	17. Senior Notes Payable IBG LLC from time to time may offer senior notes in private placements to certain qualified customers of IB LLC at an issue price of $1 thousand per note. The senior notes will mature no later than the thirtieth day following the issuance date. IBG LLC, at its option, may redeem the senior notes at any time, at a redemption price equal to 100% of the principal amount of the senior notes to be redeemed, plus accrued interest. The senior notes will pay a fixed rate of interest during their tenure. The interest rate is calculated by adding the benchmark rate to a rate (spread) that IBG LLC will announce from time to time. The benchmark rate is the effective federal funds rate as reported by the Federal Reserve Bank of New York on the morning of the date of the offering. IBG LLC intends to use the proceeds for general financing purposes when interest spread opportunities arise. The carrying value of the senior notes approximates fair value since the notes are short-term in nature. During the nine months ended September 30, 2021, IBG LLC issued senior notes of $1,428 million and redeemed senior notes of $1,524 million, respectively. The senior notes carried a weighted average interest rate of 1%. As of September 30, 2021 and December 31, 2020, IBG LLC had senior notes outstanding of $0 and $96 million, respectively, all of which carried a 1% per annum interest rate, and are included in short-term borrowings in the condensed consolidated statements of financial condition. Interest expense on the senior notes for the nine months ended September 30, 2021 was $1 million.

Senior Notes Payable

9 Months Ended

Sep. 30, 2021

17. Senior Notes Payable

IBG LLC from time to time may offer senior notes in private placements to certain qualified customers of IB LLC at an issue price of $1 thousand per note. The senior notes will mature no later than the thirtieth day following the issuance date. IBG LLC, at its option, may redeem the senior notes at any time, at a redemption price equal to 100% of the principal amount of the senior notes to be redeemed, plus accrued interest. The senior notes will pay a fixed rate of interest during their tenure. The interest rate is calculated by adding the benchmark rate to a rate (spread) that IBG LLC will announce from time to time. The benchmark rate is the effective federal funds rate as reported by the Federal Reserve Bank of New York on the morning of the date of the offering. IBG LLC intends to use the proceeds for general financing purposes when interest spread opportunities arise.

The carrying value of the senior notes approximates fair value since the notes are short-term in nature. During the nine months ended September 30, 2021, IBG LLC issued senior notes of $1,428 million and redeemed senior notes of $1,524 million, respectively. The senior notes carried a weighted average interest rate of 1%. As of September 30, 2021 and December 31, 2020, IBG LLC had senior notes outstanding of $0 and $96 million, respectively, all of which carried a 1% per annum interest rate, and are included in short-term borrowings in the condensed consolidated statements of financial condition. Interest expense on the senior notes for the nine months ended September 30, 2021 was $1 million.