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Significant Accounting Policies (Components Of Investments) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Significant Accounting Policies [Abstract]    
Equity method investments [1] $ 127 $ 121
Investment in equity securities at adjusted cost [2] 21 16
Investments in equity securities at fair value [2] 51 34
Investments in exchange memberships and equity securities of certain exchanges [2] 2 2
Total investments $ 201 $ 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.