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Fair Value of Financial Instruments - Derivative Fair Value Measurements (Details) $ in Millions	Jun. 30, 2024 USD ($) $ / MWh certificate $ / MWd $ / MMBTU	Dec. 31, 2023 USD ($) $ / MWh certificate $ / MWd
Liabilities
Derivative liabilities	$ 4,099	$ 5,507
Commodity contracts
Assets
Derivative assets	6,110	6,138
Liabilities
Derivative liabilities	3,944	5,356
Interest rate contracts
Assets
Derivative assets	26	12
Liabilities
Derivative liabilities	4	8
Level 3
Assets
Derivative assets	295	334
Liabilities
Derivative liabilities	325	349
Level 3 | RECs | Fair Value, Recurring
Assets
Derivative assets	56	58
Liabilities
Derivative liabilities	$ 15	$ 14
Level 3 | RECs | Low | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) | Fair Value, Recurring
Fair Value Inputs / Range
Derivative asset/liability, measurement input | certificate	2,000,000	2
Level 3 | RECs | High | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) | Fair Value, Recurring
Fair Value Inputs / Range
Derivative asset/liability, measurement input | certificate	248,000,000	320
Level 3 | RECs | Weighted Average | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) | Fair Value, Recurring
Fair Value Inputs / Range
Derivative asset/liability, measurement input | certificate	16,000,000	15
Level 3 | Commodity contracts
Assets
Derivative assets	$ 295	$ 334
Liabilities
Derivative liabilities	174	215
Level 3 | Commodity contracts | Natural Gas Contracts
Assets
Derivative assets	39	39
Liabilities
Derivative liabilities	$ 14	$ 65
Level 3 | Commodity contracts | Natural Gas Contracts | Low | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input	0	1
Level 3 | Commodity contracts | Natural Gas Contracts | High | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input	14,000,000	15
Level 3 | Commodity contracts | Natural Gas Contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input	4,000,000	3
Level 3 | Commodity contracts | Power Contracts
Assets
Derivative assets	$ 168	$ 197
Liabilities
Derivative liabilities	$ 102	$ 66
Level 3 | Commodity contracts | Power Contracts | Low | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input | $ / MWh	0	1
Level 3 | Commodity contracts | Power Contracts | High | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input | $ / MWh	188,000,000	210
Level 3 | Commodity contracts | Power Contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input | $ / MWh	45,000,000	47
Level 3 | Commodity contracts | FTRs
Assets
Derivative assets	$ 17	$ 19
Liabilities
Derivative liabilities	$ 31	$ 37
Level 3 | Commodity contracts | FTRs | Low | Valuation Technique, Discounted Cash Flow | Auction Prices ($ per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input	(34,000,000)	(58)
Level 3 | Commodity contracts | FTRs | High | Valuation Technique, Discounted Cash Flow | Auction Prices ($ per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input	17,974,000,000	252
Level 3 | Commodity contracts | FTRs | Weighted Average | Valuation Technique, Discounted Cash Flow | Auction Prices ($ per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input	0	0
Level 3 | Interest rate contracts
Assets
Derivative assets	$ 0	$ 0
Liabilities
Derivative liabilities	$ 0	$ 0
Level 3 | Interest rate contracts | Low | Valuation Technique, Discounted Cash Flow | Collateral Prepayment Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.0200	0.0200
Level 3 | Interest rate contracts | Low | Valuation Technique, Discounted Cash Flow | Credit Loss Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.0475	0.0600
Level 3 | Interest rate contracts | High | Valuation Technique, Discounted Cash Flow | Collateral Prepayment Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.0300	0.0300
Level 3 | Interest rate contracts | High | Valuation Technique, Discounted Cash Flow | Credit Loss Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.6000	0.6000
Level 3 | Interest rate contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Collateral Prepayment Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.0292	0.0295
Level 3 | Interest rate contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Credit Loss Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.1332	0.1257
Level 3 | Interest rate contracts | Consumer financing program
Assets
Derivative assets	$ 0	$ 0
Liabilities
Derivative liabilities	$ 151	$ 134
Level 3 | Interest rate contracts | Consumer financing program | Low | Valuation Technique, Discounted Cash Flow | Collateral Default Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.0104	0.0043
Level 3 | Interest rate contracts | Consumer financing program | High | Valuation Technique, Discounted Cash Flow | Collateral Default Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.6620	0.9330
Level 3 | Interest rate contracts | Consumer financing program | Weighted Average | Valuation Technique, Discounted Cash Flow | Collateral Default Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.0972	0.0812
Level 3 | Capacity Contracts | Capacity Contracts | Fair Value, Recurring
Assets
Derivative assets	$ 15	$ 21
Liabilities
Derivative liabilities	$ 12	$ 33
Level 3 | Capacity Contracts | Capacity Contracts | Low | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) | Fair Value, Recurring
Fair Value Inputs / Range
Derivative asset/liability, measurement input | $ / MWd	21,000,000	49
Level 3 | Capacity Contracts | Capacity Contracts | High | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) | Fair Value, Recurring
Fair Value Inputs / Range
Derivative asset/liability, measurement input | $ / MWd	641,000,000	658
Level 3 | Capacity Contracts | Capacity Contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh) | Fair Value, Recurring
Fair Value Inputs / Range
Derivative asset/liability, measurement input | $ / MWd	215,000,000	285

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