Derivative Financial Instruments (Schedule of Volume of Derivative Activity) (Detail) MWh in Millions, Bcf in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) Bcf MWh
Interest Rate Swap Current [Member]
Derivative [Line Items]
Interest rate | $	$ 0	[1]
Interest Rate Swap Current [Member] | Natural Gas (bcf)
Derivative [Line Items]
Basis | Bcf	24	[2]
Interest Rate Swap Current [Member] | Electricity [Member]
Derivative [Line Items]
Fixed price | MWh	2
Interest Rate Swap Noncurrent [Member]
Derivative [Line Items]
Interest rate | $	$ 71,000,000	[1]
Interest Rate Swap Noncurrent [Member] | Natural Gas (bcf)
Derivative [Line Items]
Basis | Bcf	0	[2]
Interest Rate Swap Noncurrent [Member] | Electricity [Member]
Derivative [Line Items]
Fixed price | MWh	23

[1] Maturity is determined based on final settlement period.

[2] Includes options.