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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, 2021
USD ($)
$ / MWh
Dec. 31, 2020
USD ($)
$ / MWh
Fair Value Measurement Inputs and Valuation Techniques [Abstract    
Cash collateral paid in support of energy risk management activities $ 291 $ 50
Cash collateral received in support of energy risk management activities 845 19
Commodity contracts    
Assets    
Derivative Assets 7,139 821
Liabilities    
Derivative Liabilities 4,798 884
Fair Value Measurement Inputs and Valuation Techniques [Abstract    
Cash collateral paid in support of energy risk management activities 17 0
Cash collateral received in support of energy risk management activities 831 5
Commodity contracts | Level 3    
Assets    
Derivative Assets 457 139
Liabilities    
Derivative Liabilities 164 155
Commodity contracts | Fair Value, Measurements, Recurring | Level 3    
Assets    
Derivative Assets 457 139
Liabilities    
Derivative Liabilities 164 155
Commodity contracts | Fair Value, Measurements, Recurring | Natural Gas Contract | Level 3    
Assets    
Derivative Assets 16  
Liabilities    
Derivative Liabilities $ 1  
Commodity contracts | Fair Value, Measurements, Recurring | Natural Gas Contract | Level 3 | Low    
Fair Value Measurement Inputs and Valuation Techniques [Abstract    
Forward Market Price (USD per MWh) | $ / MWh 3  
Commodity contracts | Fair Value, Measurements, Recurring | Natural Gas Contract | Level 3 | High    
Fair Value Measurement Inputs and Valuation Techniques [Abstract    
Forward Market Price (USD per MWh) | $ / MWh 40  
Commodity contracts | Fair Value, Measurements, Recurring | Natural Gas Contract | Level 3 | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Abstract    
Forward Market Price (USD per MWh) | $ / MWh 15  
Commodity contracts | Fair Value, Measurements, Recurring | Power Contracts | Level 3    
Assets    
Derivative Assets $ 392 111
Liabilities    
Derivative Liabilities $ 121 $ 143
Commodity contracts | Fair Value, Measurements, Recurring | Power Contracts | Level 3 | Low    
Fair Value Measurement Inputs and Valuation Techniques [Abstract    
Forward Market Price (USD per MWh) | $ / MWh 3 10
Commodity contracts | Fair Value, Measurements, Recurring | Power Contracts | Level 3 | High    
Fair Value Measurement Inputs and Valuation Techniques [Abstract    
Forward Market Price (USD per MWh) | $ / MWh 212 105
Commodity contracts | Fair Value, Measurements, Recurring | Power Contracts | Level 3 | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Abstract    
Forward Market Price (USD per MWh) | $ / MWh 35 21
Commodity contracts | Fair Value, Measurements, Recurring | Financial Transmission Rights | Level 3    
Assets    
Derivative Assets $ 49 $ 28
Liabilities    
Derivative Liabilities $ 42 $ 12
Commodity contracts | Fair Value, Measurements, Recurring | Financial Transmission Rights | Level 3 | Low    
Fair Value Measurement Inputs and Valuation Techniques [Abstract    
Auction Prices (USD per MWh) | $ / MWh (122) (28)
Commodity contracts | Fair Value, Measurements, Recurring | Financial Transmission Rights | Level 3 | High    
Fair Value Measurement Inputs and Valuation Techniques [Abstract    
Auction Prices (USD per MWh) | $ / MWh 43 43
Commodity contracts | Fair Value, Measurements, Recurring | Financial Transmission Rights | Level 3 | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Abstract    
Auction Prices (USD per MWh) | $ / MWh 0 0