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Significant Accounting Policies (Components Of Investments) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Significant Accounting Policies [Abstract]    
Equity method investments [1] $ 9 $ 22
Investment in equity securities at adjusted cost [2] 7 5
Investments in equity securities at fair value [2] 48 36
Investments in exchange memberships and equity securities of certain exchanges [2] 3 3
Total investments $ 67 $ 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.