Derivative Assets And Liabilities Table - Outstanding Commodity-Related Derivatives (Details)	Sep. 30, 2025 MMbtu Megawatt	Dec. 31, 2024 Megawatt MMbtu
Natural Gas [Member] \| Mark-To-Market Derivatives [Member] \| Basis Swaps IFERC/NYMEX [Member] \| Long [Member]
Derivative, Nonmonetary Notional Amount	63,445	3,490
Natural Gas [Member] \| Mark-To-Market Derivatives [Member] \| Swing Swaps IFERC [Member] \| Short [Member]
Derivative, Nonmonetary Notional Amount	142,195	156,820
Natural Gas [Member] \| Mark-To-Market Derivatives [Member] \| Fixed Swaps/Futures [Member] \| Short [Member]
Derivative, Nonmonetary Notional Amount	21,270
Natural Gas [Member] \| Mark-To-Market Derivatives [Member] \| Fixed Swaps/Futures [Member] \| Long [Member]
Derivative, Nonmonetary Notional Amount		6,630
Natural Gas [Member] \| Fair Value Hedging [Member] \| Basis Swaps IFERC/NYMEX [Member] \| Short [Member]
Derivative, Nonmonetary Notional Amount	47,840	47,170
Natural Gas [Member] \| Fair Value Hedging [Member] \| Fixed Swaps/Futures [Member] \| Short [Member]
Derivative, Nonmonetary Notional Amount	47,840	47,170
Natural Gas [Member] \| Fair Value Hedging [Member] \| Hedged Item - Inventory (MMBtu) [Member] \| Long [Member]
Derivative, Nonmonetary Notional Amount	47,840	44,170
Power [Member] \| Mark-To-Market Derivatives [Member] \| Options - Puts [Member] \| Long [Member]
Derivative, Nonmonetary Notional Amount \| Megawatt	30,400
Power [Member] \| Mark-To-Market Derivatives [Member] \| Call Option [Member] \| Short [Member]
Derivative, Nonmonetary Notional Amount \| Megawatt	500,000
Power [Member] \| Mark-To-Market Derivatives [Member] \| Call Option [Member] \| Long [Member]
Derivative, Nonmonetary Notional Amount \| Megawatt		0
Power [Member] \| Mark-To-Market Derivatives [Member] \| Forwards Swaps [Member] \| Long [Member]
Derivative, Nonmonetary Notional Amount \| Megawatt	50,800	6,040
Power [Member] \| Mark-To-Market Derivatives [Member] \| Future [Member] \| Short [Member]
Derivative, Nonmonetary Notional Amount \| Megawatt		140,137
Power [Member] \| Mark-To-Market Derivatives [Member] \| Future [Member] \| Long [Member]
Derivative, Nonmonetary Notional Amount \| Megawatt	62,209
Power [Member] \| Mark-To-Market Derivatives [Member] \| Put Option [Member] \| Short [Member]
Derivative, Nonmonetary Notional Amount \| Megawatt		17,600
Crude Oil [Member] \| Mark-To-Market Derivatives [Member] \| Forward Swaps [Member] \| Short [Member]
Derivative, Nonmonetary Notional Amount	20,494	22,512
NGL/Refined product \| Mark-To-Market Derivatives [Member] \| Call Option [Member] \| Short [Member]
Derivative, Nonmonetary Notional Amount	1	14
NGL/Refined product \| Mark-To-Market Derivatives [Member] \| Future [Member] \| Short [Member]
Derivative, Nonmonetary Notional Amount	5,442	1,763
NGL/Refined product \| Mark-To-Market Derivatives [Member] \| Put Option [Member] \| Short [Member]
Derivative, Nonmonetary Notional Amount		9
NGL/Refined product \| Mark-To-Market Derivatives [Member] \| Put Option [Member] \| Long [Member]
Derivative, Nonmonetary Notional Amount	6
NGL/Refined product \| Mark-To-Market Derivatives [Member] \| Forward Swaps [Member] \| Short [Member]
Derivative, Nonmonetary Notional Amount	20,129	15,063