Trust Investments - Amount Of Available-For-Sale Debt Securities By Maturity Periods (Details) $ in Millions	Sep. 30, 2024 USD ($)
Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Total Available-for-Sale Debt Securities	$ 1,312
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Total Available-for-Sale Debt Securities	156
Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Less than one year	21
1 - 5 years	335
6 - 10 years	233
11 - 15 years	71
16 - 20 years	115
Over 20 years	537
Debt Securities [Member] | Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Less than one year	5
1 - 5 years	28
6 - 10 years	17
11 - 15 years	10
16 - 20 years	17
Over 20 years	$ 79