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Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2021
Significant Accounting Policies [Abstract]  
Schedule Of Securities Segregated For Regulatory Purposes

March 31,

December 31,

2021

2020

(in millions)

U.S. government securities

$

3,925 

$

4,750 

Securities purchased under agreements to resell 1

21,144 

23,071 

$

25,069 

$

27,821 

________________________

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

Composition Of Investment

March 31,

December 31,

2021

2020

(in millions)

Equity method investments1

$

12 

$

11 

Investments in equity securities at adjusted cost2

10 

10 

Investments in equity securities at fair value2

179 

80 

Investments in exchange memberships and equity securities of certain exchanges2

3 

3 

$

204 

$

104 

________________________

(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 equity method of accounting and the dividends received are included in other income in the condensed consolidated statements of comprehensive income.