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Fair Value of Financial Instruments - Significant Unobservable Inputs Used in Fair Value of Level 3 Positions (Details) $ in Millions	Dec. 31, 2024 USD ($) $ / MWh $ / MWd $ / MMBTU certificate	Dec. 31, 2023 USD ($) certificate $ / MWh $ / MWd
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Cash collateral paid in support of energy risk management activities	$ 309	$ 441
Cash collateral received in support of energy risk management activities	199	84
Commodity contracts
Assets
Derivative Assets	4,365	6,138
Liabilities
Derivative Liabilities	3,197	5,356
Commodity contracts | Level 3
Assets
Derivative Assets		334
Liabilities
Derivative Liabilities		215
Commodity contracts | Fair Value, Measurements, Recurring | Level 3
Assets
Derivative Assets	195	334
Liabilities
Derivative Liabilities	359	349
Consumer Financing Program
Assets
Derivative Assets	9	12
Liabilities
Derivative Liabilities	3	8
Consumer Financing Program | Level 3
Assets
Derivative Assets	0	$ 0
Liabilities
Derivative Liabilities	0
Consumer Financing Program | Level 3 | Low | Collateral Prepayment Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability		0.0200
Consumer Financing Program | Level 3 | Low | Credit Loss Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability		0.0600
Consumer Financing Program | Level 3 | High | Collateral Prepayment Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability		0.0300
Consumer Financing Program | Level 3 | High | Credit Loss Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability		0.6000
Consumer Financing Program | Level 3 | Weighted Average | Collateral Prepayment Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability		0.0295
Consumer Financing Program | Level 3 | Weighted Average | Credit Loss Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability		0.1257
Natural Gas Contracts | Commodity contracts | Level 3
Assets
Derivative Assets		$ 39
Liabilities
Derivative Liabilities		$ 65
Natural Gas Contracts | Commodity contracts | Level 3 | Low | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh		1
Natural Gas Contracts | Commodity contracts | Level 3 | High | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh		15
Natural Gas Contracts | Commodity contracts | Level 3 | Weighted Average | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh		3,000,000
Natural Gas Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Level 3
Assets
Derivative Assets	56
Liabilities
Derivative Liabilities	$ 15
Natural Gas Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Level 3 | Low | Forward Market Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MMBTU	2
Natural Gas Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Level 3 | High | Forward Market Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MMBTU	27
Natural Gas Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Forward Market Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MMBTU	4,000,000
Power Contracts | Commodity contracts | Level 3
Assets
Derivative Assets		$ 197
Liabilities
Derivative Liabilities		$ 66
Power Contracts | Commodity contracts | Level 3 | Low | Forward Market Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh		1
Power Contracts | Commodity contracts | Level 3 | High | Forward Market Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh		210
Power Contracts | Commodity contracts | Level 3 | Weighted Average | Forward Market Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh		47,000,000
Power Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Level 3
Assets
Derivative Assets	$ 57
Liabilities
Derivative Liabilities	$ 86
Power Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Level 3 | Low | Forward Market Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh	0
Power Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Level 3 | High | Forward Market Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh	109
Power Contracts | Commodity contracts | Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Forward Market Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh	39,000,000
Capacity Contracts | Capacity Contracts | Fair Value, Measurements, Recurring | Level 3
Assets
Derivative Assets	$ 34	$ 21
Liabilities
Derivative Liabilities	$ 13	$ 33
Capacity Contracts | Capacity Contracts | Fair Value, Measurements, Recurring | Level 3 | Low | Forward Market Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWd	16	49
Capacity Contracts | Capacity Contracts | Fair Value, Measurements, Recurring | Level 3 | High | Forward Market Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWd	510	658
Capacity Contracts | Capacity Contracts | Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Forward Market Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWd	220,000,000	285,000,000
Renewables Energy Certificates | Fair Value, Measurements, Recurring | Level 3
Assets
Derivative Assets	$ 30	$ 58
Liabilities
Derivative Liabilities	$ 14	$ 14
Renewables Energy Certificates | Fair Value, Measurements, Recurring | Level 3 | Low | Forward Market Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | certificate	2	2
Renewables Energy Certificates | Fair Value, Measurements, Recurring | Level 3 | High | Forward Market Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | certificate	375	320
Renewables Energy Certificates | Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Forward Market Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | certificate	15,000,000	15,000,000
FTRs | Commodity contracts | Level 3
Assets
Derivative Assets		$ 19
Liabilities
Derivative Liabilities		$ 37
FTRs | Commodity contracts | Level 3 | Low | Auction Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input		(58)
FTRs | Commodity contracts | Level 3 | High | Auction Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input		252
FTRs | Commodity contracts | Level 3 | Weighted Average | Auction Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input		0
FTRs | Commodity contracts | Fair Value, Measurements, Recurring | Level 3
Assets
Derivative Assets	$ 18
Liabilities
Derivative Liabilities	$ 28
FTRs | Commodity contracts | Fair Value, Measurements, Recurring | Level 3 | Low | Auction Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh	(50)
FTRs | Commodity contracts | Fair Value, Measurements, Recurring | Level 3 | High | Auction Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh	16,180
FTRs | Commodity contracts | Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Auction Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh	0
Consumer Financing Program | Consumer Financing Program | Level 3
Assets
Derivative Assets	$ 0	$ 0
Liabilities
Derivative Liabilities	$ 203	$ 134
Consumer Financing Program | Consumer Financing Program | Level 3 | Low | Collateral Default Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability	0.0052	0.0043
Consumer Financing Program | Consumer Financing Program | Level 3 | Low | Collateral Prepayment Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability	0.0200
Consumer Financing Program | Consumer Financing Program | Level 3 | Low | Credit Loss Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability	0.0600
Consumer Financing Program | Consumer Financing Program | Level 3 | High | Collateral Default Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability	0.7680	0.9330
Consumer Financing Program | Consumer Financing Program | Level 3 | High | Collateral Prepayment Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability	0.0300
Consumer Financing Program | Consumer Financing Program | Level 3 | High | Credit Loss Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability	0.6000
Consumer Financing Program | Consumer Financing Program | Level 3 | Weighted Average | Collateral Default Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability	0.1171	0.0812
Consumer Financing Program | Consumer Financing Program | Level 3 | Weighted Average | Collateral Prepayment Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability	0.0283
Consumer Financing Program | Consumer Financing Program | Level 3 | Weighted Average | Credit Loss Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability	0.1422

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