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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2019
Significant Accounting Policies [Abstract]  
Schedule Of Securities Segregated For Regulatory Purposes

December 31,

2019

2018

(in billions)

U.S. government securities

$

3.8

$

4.2

Securities purchased under agreements to resell1

14.0

11.4

$

17.8

$

15.6

___________________________

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

Composition Of Investment

December 31,

2019

2018

(in millions)

Equity method investments1

$

22

$

23

Investments in equity securities at adjusted cost2

5

25

Investments in equity securities at fair value2

36

-

Investments in exchange memberships and equity securities of certain exchanges2

3

5

$

66

$

53

___________________________

(1)The Company’s share of income or losses is included in other income in the 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 consolidated statements of comprehensive income.