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Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2025
Significant Accounting Policies [Abstract]  
Schedule Of Securities Segregated For Regulatory Purposes

March 31,

December 31,

2025

2024

(in millions)

U.S. and foreign government securities

$

6,361

$

6,460

Municipal securities

33

33

Securities purchased under agreements to resell 1

22,860

21,353

Securities borrowed 1

140

-

$

29,394

$

27,846

________________________

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

Composition Of Investment

March 31,

December 31,

2025

2024

(in millions)

Equity method investments 1

$

159

$

172

Investments in equity securities at adjusted cost 2

39

29

Investments in equity securities at fair value 2

43

32

Investments in exchange memberships and equity securities of certain exchanges 2

2

2

$

243

$

235

________________________

(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.