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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, 2023 USD ($) certificate $ / MWd $ / MMBTU $ / MWh	Dec. 31, 2022 USD ($) $ / MWh
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Cash collateral paid in support of energy risk management activities	$ 441	$ 260
Cash collateral received in support of energy risk management activities	84	1,708
Fair Value, Measurements, Recurring | Renewables Energy Certificates | Level 3
Assets
Derivative Assets	58
Liabilities
Derivative Liabilities	$ 14
Fair Value, Measurements, Recurring | Renewables Energy Certificates | Level 3 | Low | Forward Market Price
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | certificate	2
Fair Value, Measurements, Recurring | Renewables Energy Certificates | Level 3 | High | Forward Market Price
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | certificate	320
Fair Value, Measurements, Recurring | Renewables Energy Certificates | Level 3 | Weighted Average | Forward Market Price
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | certificate	15,000,000
Commodity contracts
Assets
Derivative Assets	$ 6,138	11,976
Liabilities
Derivative Liabilities	5,356	8,439
Commodity contracts | Level 3
Assets
Derivative Assets	334	1,251
Liabilities
Derivative Liabilities	215	746
Commodity contracts | Natural Gas Contracts | Level 3
Assets
Derivative Assets		340
Liabilities
Derivative Liabilities		$ 448
Commodity contracts | Natural Gas Contracts | Level 3 | Low
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh		2
Commodity contracts | Natural Gas Contracts | Level 3 | High
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh		48
Commodity contracts | Natural Gas Contracts | Level 3 | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh		6
Commodity contracts | Fair Value, Measurements, Recurring | Level 3
Assets
Derivative Assets	334	$ 1,251
Liabilities
Derivative Liabilities	349	746
Commodity contracts | Fair Value, Measurements, Recurring | Natural Gas Contracts | Level 3
Assets
Derivative Assets	39
Liabilities
Derivative Liabilities	$ 65
Commodity contracts | Fair Value, Measurements, Recurring | Natural Gas Contracts | Level 3 | Low | Forward Market Price
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MMBTU	1
Commodity contracts | Fair Value, Measurements, Recurring | Natural Gas Contracts | Level 3 | High | Forward Market Price
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MMBTU	15
Commodity contracts | Fair Value, Measurements, Recurring | Natural Gas Contracts | Level 3 | Weighted Average | Forward Market Price
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MMBTU	3,000,000
Commodity contracts | Fair Value, Measurements, Recurring | Power Contracts | Level 3
Assets
Derivative Assets	$ 197	843
Liabilities
Derivative Liabilities	$ 66	$ 216
Commodity contracts | Fair Value, Measurements, Recurring | Power Contracts | Level 3 | Low
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh		3
Commodity contracts | Fair Value, Measurements, Recurring | Power Contracts | Level 3 | Low | Forward Market Price
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh	1
Commodity contracts | Fair Value, Measurements, Recurring | Power Contracts | Level 3 | High
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh		431
Commodity contracts | Fair Value, Measurements, Recurring | Power Contracts | Level 3 | High | Forward Market Price
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh	210
Commodity contracts | Fair Value, Measurements, Recurring | Power Contracts | Level 3 | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh		48
Commodity contracts | Fair Value, Measurements, Recurring | Power Contracts | Level 3 | Weighted Average | Forward Market Price
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh	47,000,000
Commodity contracts | Fair Value, Measurements, Recurring | FTRs | Level 3
Assets
Derivative Assets	$ 19	$ 68
Liabilities
Derivative Liabilities	$ 37	$ 82
Commodity contracts | Fair Value, Measurements, Recurring | FTRs | Level 3 | Low
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh		(32)
Commodity contracts | Fair Value, Measurements, Recurring | FTRs | Level 3 | Low | Auction Price
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh	(58)
Commodity contracts | Fair Value, Measurements, Recurring | FTRs | Level 3 | High
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh		610
Commodity contracts | Fair Value, Measurements, Recurring | FTRs | Level 3 | High | Auction Price
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh	252
Commodity contracts | Fair Value, Measurements, Recurring | FTRs | Level 3 | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh		0
Commodity contracts | Fair Value, Measurements, Recurring | FTRs | Level 3 | Weighted Average | Auction Price
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWh	0
Interest rate contracts
Assets
Derivative Assets	$ 12
Liabilities
Derivative Liabilities	8
Interest rate contracts | Level 3
Assets
Derivative Assets	0
Liabilities
Derivative Liabilities	$ 0
Interest rate contracts | Level 3 | Low | Collateral Prepayment Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability	0.0200
Interest rate contracts | Level 3 | Low | Credit Loss Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability	0.0600
Interest rate contracts | Level 3 | High | Collateral Prepayment Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability	0.0300
Interest rate contracts | Level 3 | High | Credit Loss Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability	0.6000
Interest rate contracts | Level 3 | Weighted Average | Collateral Prepayment Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability	0.0295
Interest rate contracts | Level 3 | Weighted Average | Credit Loss Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability	0.1257
Interest rate contracts | Consumer Financing Program | Level 3
Assets
Derivative Assets	$ 0
Liabilities
Derivative Liabilities	$ 134
Interest rate contracts | Consumer Financing Program | Level 3 | Low | Collateral Default Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability	0.0043
Interest rate contracts | Consumer Financing Program | Level 3 | High | Collateral Default Rates | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative liability	0.9330
Interest rate contracts | 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	0.0812
Capacity Contracts | Fair Value, Measurements, Recurring | Capacity Contracts | Level 3
Assets
Derivative Assets	$ 21
Liabilities
Derivative Liabilities	$ 33
Capacity Contracts | Fair Value, Measurements, Recurring | Capacity Contracts | Level 3 | Low | Forward Market Price
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWd	49
Capacity Contracts | Fair Value, Measurements, Recurring | Capacity Contracts | Level 3 | High | Forward Market Price
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWd	658
Capacity Contracts | Fair Value, Measurements, Recurring | Capacity Contracts | Level 3 | Weighted Average | Forward Market Price
Fair Value Measurement Inputs and Valuation Techniques [Abstract
Derivative asset/ liability measurement input | $ / MWd	285,000,000

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