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Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2023
Significant Accounting Policies [Abstract]  
Schedule Of Securities Segregated For Regulatory Purposes

September 30,

December 31,

2023

2022

(in millions)

U.S. and foreign government securities

$

5,687

$

4,641

Municipal securities

39

82

Securities purchased under agreements to resell 1

25,609

27,058

$

31,335

$

31,781

______________________________

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

Composition Of Investment

September 30,

December 31,

2023

2022

(in millions)

Equity method investments 1

$

127

$

121

Investments in equity securities at adjusted cost 2

21

16

Investments in equity securities at fair value 2

51

34

Investments in exchange memberships and equity securities of certain exchanges 2

2

2

$

201

$

173

______________________________

(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.