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Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2020
Significant Accounting Policies [Abstract]  
Schedule Of Securities Segregated For Regulatory Purposes

March 31,

December 31,

2020

2019

(in billions)

U.S. government securities

$

3.2 

$

3.8 

Securities purchased under agreements to resell 1

27.0 

14.0 

$

30.2 

$

17.8 

___________________________

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

Composition Of Investment

March 31,

December 31,

2020

2019

(in millions)

Equity method investments1

$

21 

$

22 

Investments in equity securities at adjusted cost2

5 

5 

Investments in equity securities at fair value2

28 

36 

Investments in exchange memberships and equity securities of certain exchanges2

3 

3 

$

57 

$

66 

___________________________

(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.