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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, 2022 USD ($) $ / MWh | Dec. 31, 2021 USD ($) $ / MWh
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Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Cash collateral paid in support of energy risk management activities | $ 260 | $ 291
Cash collateral received in support of energy risk management activities | 1,708 | 845
Commodity contracts |  |
Assets |  |
Derivative Assets | 11,976 | 7,139
Liabilities |  |
Derivative Liabilities | 8,439 | 4,798
Commodity contracts | Level 3 |  |
Assets |  |
Derivative Assets | 1,251 | 457
Liabilities |  |
Derivative Liabilities | 746 | 164
Commodity contracts | Natural Gas Contracts | Level 3 |  |
Assets |  |
Derivative Assets |  | 16
Liabilities |  |
Derivative Liabilities |  | $ 1
Commodity contracts | Natural Gas Contracts | Level 3 | Low |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Forward Market Price (USD per MWh) | $ / MWh |  | 3
Commodity contracts | Natural Gas Contracts | Level 3 | High |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Forward Market Price (USD per MWh) | $ / MWh |  | 40
Commodity contracts | Natural Gas Contracts | 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 | Level 3 |  |
Assets |  |
Derivative Assets | 1,251 | $ 457
Liabilities |  |
Derivative Liabilities | 746 | 164
Commodity contracts | Fair Value, Measurements, Recurring | Natural Gas Contracts | Level 3 |  |
Assets |  |
Derivative Assets | 340 |
Liabilities |  |
Derivative Liabilities | $ 448 |
Commodity contracts | Fair Value, Measurements, Recurring | Natural Gas Contracts | Level 3 | Low |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Forward Market Price (USD per MWh) | $ / MWh | 2 |
Commodity contracts | Fair Value, Measurements, Recurring | Natural Gas Contracts | Level 3 | High |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Forward Market Price (USD per MWh) | $ / MWh | 48 |
Commodity contracts | Fair Value, Measurements, Recurring | Natural Gas Contracts | Level 3 | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Forward Market Price (USD per MWh) | $ / MWh | 6 |
Commodity contracts | Fair Value, Measurements, Recurring | Power Contracts | Level 3 |  |
Assets |  |
Derivative Assets | $ 843 | 392
Liabilities |  |
Derivative Liabilities | $ 216 | $ 121
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 | 3
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 | 431 | 212
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 | 48 | 35
Commodity contracts | Fair Value, Measurements, Recurring | FTRs | Level 3 |  |
Assets |  |
Derivative Assets | $ 68 | $ 49
Liabilities |  |
Derivative Liabilities | $ 82 | $ 42
Commodity contracts | Fair Value, Measurements, Recurring | FTRs | Level 3 | Low |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Auction Prices (USD per MWh) | $ / MWh | (32) | (122)
Commodity contracts | Fair Value, Measurements, Recurring | FTRs | Level 3 | High |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Auction Prices (USD per MWh) | $ / MWh | 610 | 43
Commodity contracts | Fair Value, Measurements, Recurring | FTRs | Level 3 | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract |  |
Auction Prices (USD per MWh) | $ / MWh | 0 | 0

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