Derivative Financial Instruments (Schedule of Volume of Derivative Activity) (Detail) MWh in Millions, Bcfe in Millions, Bcf in Millions	6 Months Ended
	Jun. 30, 2025 USD ($) Bcf Bcfe MWh
Interest Rate Swap Current [Member]
Derivative [Line Items]
Interest rate | $	$ 0	[1]
Interest Rate Swap Current [Member] | Natural Gas (bcf) [Member]
Derivative [Line Items]
Basis | Bcf	36	[2]
Fixed price | Bcfe	3
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) [Member]
Derivative [Line Items]
Basis | Bcf	27	[2]
Fixed price | Bcfe	0
Interest Rate Swap Noncurrent [Member] | Electricity [Member]
Derivative [Line Items]
Fixed price | MWh	22

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

[2] Includes options.