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Fair Value of Financial Instruments - Derivative Fair Value Measurements (Details)
$ in Millions
Jun. 30, 2025
USD ($)
$ / MWh
$ / MMBTU
certificate
$ / MWd
Dec. 31, 2024
USD ($)
certificate
$ / MWh
$ / MWd
Liabilities    
Derivative liabilities   $ 3,177
Commodity contracts    
Assets    
Derivative assets $ 4,074 4,365
Liabilities    
Derivative liabilities 2,960 3,197
Interest rate contracts    
Assets    
Derivative assets   9
Liabilities    
Derivative liabilities 7 3
Level 3    
Assets    
Derivative assets 310 195
Liabilities    
Derivative liabilities 486 359
Level 3 | Renewable Energy Certificates | Fair Value, Recurring    
Assets    
Derivative assets 18 30
Liabilities    
Derivative liabilities $ 38 $ 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 380 375
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 15 15
Level 3 | Power Options | Low | Valuation Technique Option Model | Volatilities | Fair Value, Recurring    
Fair Value Inputs / Range    
Derivative asset/liability, measurement input 0.24  
Level 3 | Power Options | High | Valuation Technique Option Model | Volatilities | Fair Value, Recurring    
Fair Value Inputs / Range    
Derivative asset/liability, measurement input 7.74  
Level 3 | Power Options | Weighted Average | Valuation Technique Option Model | Volatilities | Fair Value, Recurring    
Fair Value Inputs / Range    
Derivative asset/liability, measurement input 1.26  
Level 3 | Commodity contracts | Natural Gas Contracts    
Assets    
Derivative assets $ 32 $ 56
Liabilities    
Derivative liabilities $ 9 $ 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 1 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 18 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 4 4
Level 3 | Commodity contracts | Power Contracts    
Assets    
Derivative assets $ 128 $ 57
Liabilities    
Derivative liabilities $ 66 $ 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 2 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 123 109
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 36 39
Level 3 | Commodity contracts | FTRs    
Assets    
Derivative assets $ 24 $ 18
Liabilities    
Derivative liabilities $ 12 $ 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 (36,281) (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 3,011 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 $ 27 $ 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 16 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 524 510
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 218 220
Level 3 | Power Options | Power Options    
Assets    
Derivative assets $ 81  
Liabilities    
Derivative liabilities 95  
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 0.0630 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 0.0262 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 0.1653 0.1422
Level 3 | Interest rate contracts | Consumer Financing Program    
Assets    
Derivative assets $ 0 $ 0
Liabilities    
Derivative liabilities $ 257 $ 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 0.0075 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 0.4978 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 0.0847 0.1171