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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
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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

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