Fair Value of Financial Assets and Liabilities - Commodity Derivatives (Details) MWh in Millions, $ in Millions		Mar. 31, 2024 USD ($) MWh	Dec. 31, 2023 MWh
Electric Commodity [Member]
Derivative [Line Items]
Mwh of electricity | MWh	[1]	10	8
cash flow hedge commodity
Derivative [Line Items]
Commodity contracts designated as cash flow hedges | $		$ 0

[1] Not reflective of net positions in the underlying commodities.