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Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2024
Significant Accounting Policies [Abstract]  
Schedule Of Securities Segregated For Regulatory Purposes

September 30,

December 31,

2024

2023

(in millions)

U.S. and foreign government securities

$

6,631

$

5,684

Municipal securities

57

70

Securities purchased under agreements to resell 1

24,415

29,632

$

31,103

$

35,386

________________________

(1)These balances are collateralized by U.S. government securities.

Composition Of Investment

September 30,

December 31,

2024

2023

(in millions)

Equity method investments 1

$

157

$

142

Investments in equity securities at adjusted cost 2

28

22

Investments in equity securities at fair value 2

54

44

Investments in exchange memberships and equity securities of certain exchanges 2

2

2

$

241

$

210

________________________

(1)The Company’s share of income or losses is included in "Other income” in the condensed consolidated statements of comprehensive income.

(2)These investments do not qualify for the equity method of accounting. Dividends received are included in "Other income” in the condensed consolidated statements of comprehensive income.