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Significant Accounting Policies (Components Of Investments) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Significant Accounting Policies [Abstract] |  |  |
Equity method investments | [1] | $ 122 | $ 121
Investment in equity securities at adjusted cost | [2] | 16 | 16
Investments in equity securities at fair value | [2] | 33 | 34
Investments in exchange memberships and equity securities of certain exchanges | [2] | 2 | 2
Total investments |  | $ 173 | $ 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.

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- Definition Investments that are measured at adjusted cost since they do not have a readily determinable fair value. Adjusted cost represents the historical cost, less impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. + References No definition available. + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(10)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8813-108599 + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI https://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740 + Details
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- Definition Amount of capitalized cost for obtaining membership with right to do business on trading exchange. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 340 -Section 25 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=99387790&loc=d3e43427-110978 + Details
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