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Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2024

Sep. 30, 2023

Sep. 30, 2024

Sep. 30, 2023

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

^[1]

$ 507

$ 385

$ 1,419

$ 1,154

United States [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

^[1]

317

239

885

714

International [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

^[1]

190

146

534

440

Commissions [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

435

333

1,220

1,012

Market Data Fees [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

^[2]

18

17

53

53

Risk Exposure Fees [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

^[2]

26

13

69

29

Payments For Order Flow [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

^[2]

12

8

32

23

FDIC Sweep Fees [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

^[2]

7

5

20

13

Others [Member]

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

^[2]

$ 9

$ 9

$ 25

$ 24

[1]	Based on the location of the subsidiaries in which the revenues are recorded.
[2]	Included in “Other fees and services” in the condensed consolidated statements of comprehensive income.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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