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Fair Value (Fair Value of the Fixed Income Securities Held in Nuclear Decommissioning Trust Funds) (Details) - Fixed income securities - Nuclear decommissioning trust fund $ in Millions | Jun. 30, 2025 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Due within one year | $ 16
Due after one through five years | 97
Due after five through ten years | 105
Due after ten years | 334
Fixed income securities total | $ 552

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 320 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477268/942-320-50-3A + Details
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