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Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2023
Significant Accounting Policies [Abstract]  
Schedule Of Securities Segregated For Regulatory Purposes

March 31,

December 31,

2023

2022

(in millions)

U.S. and foreign government securities

$

6,385

$

4,641

Municipal securities

43

82

Securities purchased under agreements to resell 1

30,559

27,058

$

36,987

$

31,781

________________________

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

Composition Of Investment

March 31,

December 31,

2023

2022

(in millions)

Equity method investments 1

$

122

$

121

Investments in equity securities at adjusted cost 2

16

16

Investments in equity securities at fair value 2

33

34

Investments in exchange memberships and equity securities of certain exchanges 2

2

2

$

173

$

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.