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Fair Value of Financial Instruments - Derivative Fair Value Measurements (Details) $ in Millions	Sep. 30, 2025 USD ($) $ / MWh $ / MWd $ / MMBTU certificate	Dec. 31, 2024 USD ($) $ / MWh $ / MWd certificate
Liabilities
Derivative liabilities		$ 3,177
Commodity contracts
Assets
Derivative assets	$ 3,406	4,365
Liabilities
Derivative liabilities	2,702	3,197
Interest rate contracts
Assets
Derivative assets		9
Liabilities
Derivative liabilities	6	3
Level 3
Assets
Derivative assets	264	195
Liabilities
Derivative liabilities	482	359
Level 3 | Renewable Energy Certificates | Fair Value, Recurring
Assets
Derivative assets	12	30
Liabilities
Derivative liabilities	$ 16	$ 14
Level 3 | Renewable Energy Certificates | 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	2
Level 3 | Renewable Energy Certificates | 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	385	375
Level 3 | Renewable Energy Certificates | 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	18	15
Level 3 | Power Options | Low | Valuation Technique Option Model | Volatilities | Fair Value, Recurring
Fair Value Inputs / Range
Derivative asset/liability, measurement input	0.22
Level 3 | Power Options | High | Valuation Technique Option Model | Volatilities | Fair Value, Recurring
Fair Value Inputs / Range
Derivative asset/liability, measurement input	2.64
Level 3 | Power Options | Weighted Average | Valuation Technique Option Model | Volatilities | Fair Value, Recurring
Fair Value Inputs / Range
Derivative asset/liability, measurement input	1.05
Level 3 | Commodity contracts | Natural Gas Contracts
Assets
Derivative assets	$ 24	$ 56
Liabilities
Derivative liabilities	$ 7	$ 15
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	2
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	15	27
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	5	4
Level 3 | Commodity contracts | Power Contracts
Assets
Derivative assets	$ 122	$ 57
Liabilities
Derivative liabilities	$ 60	$ 86
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	0
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	126	109
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	32	39
Level 3 | Commodity contracts | FTRs
Assets
Derivative assets	$ 21	$ 18
Liabilities
Derivative liabilities	$ 11	$ 28
Level 3 | Commodity contracts | FTRs | Low | Valuation Technique, Discounted Cash Flow | Auction Prices ($ per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input	(57)	(50)
Level 3 | Commodity contracts | FTRs | High | Valuation Technique, Discounted Cash Flow | Auction Prices ($ per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input	28,331	16,180
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 | Capacity Contracts | Capacity Contracts | Fair Value, Recurring
Assets
Derivative assets	$ 29	$ 34
Liabilities
Derivative liabilities	$ 9	$ 13
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	40	16
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	534	510
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	234	220
Level 3 | Power Options | Power Options
Assets
Derivative assets	$ 56
Liabilities
Derivative liabilities	84
Level 3 | Interest rate contracts
Assets
Derivative assets		$ 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	0.0640	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	0.0254	0.0283
Level 3 | Interest rate contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Credit Loss Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.1619	0.1422
Level 3 | Interest rate contracts | Consumer Financing Program
Assets
Derivative assets	$ 0	$ 0
Liabilities
Derivative liabilities	$ 295	$ 203
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	0.0071	0.0052
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	0.4110	0.7680
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	0.0781	0.1171

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