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Cash and Marketable Securities (Narrative) (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Marketable Securities [Line Items] |  |
Proceeds from sales of securities | $ 0 | $ 48,000,000
Available for sale securities, maturities | 0 | 12,000,000
Available for sale securities, gross realized gains | 0 | 1,000,000
Available for sale securities, gross realized losses | 0 | 1,000,000
Impairment charges due to other than temporary declines in value of certain investments | $ 0 | $ 0

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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + Details
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