Fair Value (Fair Value of the Fixed Income Securities Held in Nuclear Decommissioning Trust Funds) (Details) - Nuclear decommissioning trusts - Fixed Income Securities $ in Millions	Dec. 31, 2025 USD ($)
Debt Securities, Available-for-sale [Line Items]
Due within one year	$ 20
Due after one through five years	93
Due after five through ten years	127
Due after ten years	353
Fixed income securities total	$ 593