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Fair Value Measurements - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details) - Level 3 - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Assets $ 630,000,000 $ 791,000,000
Liabilities (1,674,000,000) (2,010,000,000)
Total (1,044,000,000) (1,219,000,000)
Electricity purchases and sales | Income Approach    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Assets 449,000,000 603,000,000
Liabilities (1,273,000,000) (1,332,000,000)
Total (824,000,000) (729,000,000)
Electricity purchases and sales | Income Approach | Minimum    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Fair value inputs, hourly price curve shape 0 0
Fair value inputs, Illiquid delivery periods for hub power prices and heat rates 30 25
Electricity purchases and sales | Income Approach | Maximum    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Fair value inputs, hourly price curve shape 85 80
Fair value inputs, Illiquid delivery periods for hub power prices and heat rates 110 95
Electricity purchases and sales | Income Approach | Arithmetic Average    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Fair value inputs, hourly price curve shape 44 38
Fair value inputs, Illiquid delivery periods for hub power prices and heat rates 71 60
Options | Option Pricing Model    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Assets 1,000,000 0
Liabilities (237,000,000) (483,000,000)
Total $ (236,000,000) $ (483,000,000)
Options | Option Pricing Model | Minimum    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Fair value inputs, gas to power correlation (percent) 10.00% 10.00%
Fair value inputs, power and gas volatility (percent) 10.00% 5.00%
Options | Option Pricing Model | Maximum    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Fair value inputs, gas to power correlation (percent) 100.00% 100.00%
Fair value inputs, power and gas volatility (percent) 870.00% 620.00%
Options | Option Pricing Model | Arithmetic Average    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Fair value inputs, gas to power correlation (percent) 55.00% 56.00%
Fair value inputs, power and gas volatility (percent) 441.00% 313.00%
Financial transmission rights | Market Approach    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Assets $ 157,000,000 $ 132,000,000
Liabilities (34,000,000) (31,000,000)
Total 123,000,000 101,000,000
Financial transmission rights | Market Approach | Minimum    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Fair value inputs, Illiquid price differences between settlement points (85) (35)
Financial transmission rights | Market Approach | Maximum    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Fair value inputs, Illiquid price differences between settlement points 25 10
Financial transmission rights | Market Approach | Arithmetic Average    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Fair value inputs, Illiquid price differences between settlement points (30) (11)
Natural gas | Income Approach    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Assets 9,000,000 20,000,000
Liabilities (112,000,000) (155,000,000)
Total (103,000,000) (135,000,000)
Natural gas | Income Approach | Minimum    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Fair value inputs, gas basis 0 0
Fair value inputs, delivery periods 0  
Natural gas | Income Approach | Maximum    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Fair value inputs, gas basis 15 30
Fair value inputs, delivery periods 5  
Natural gas | Income Approach | Arithmetic Average    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Fair value inputs, gas basis 6 13
Fair value inputs, delivery periods 4  
Other    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Assets 14,000,000 36,000,000
Liabilities (18,000,000) (9,000,000)
Total $ (4,000,000) $ 27,000,000