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Fair Value of Financial Instruments - Derivative Fair Value Measurements (Details) $ in Millions | Jun. 30, 2022 USD ($) $ / MWh | Dec. 31, 2021 USD ($) $ / MWh
--- | --- | ---
Liabilities |  |
Commodity contracts | $ 10,565 | $ 4,799
Level 3 |  |
Liabilities |  |
Commodity contracts | 875 | 164
Commodity contracts |  |
Assets |  |
Derivative assets | 15,865 | 7,139
Liabilities |  |
Commodity contracts | 10,565 | 4,798
Commodity contracts | Level 3 |  |
Assets |  |
Derivative assets | 2,278 | 457
Liabilities |  |
Commodity contracts | 875 | 164
Commodity contracts | Level 3 | Natural Gas Contracts |  |
Assets |  |
Derivative assets | 55 | 16
Liabilities |  |
Commodity contracts | $ 56 | $ 1
Commodity contracts | Level 3 | Natural Gas Contracts | Low |  |
Fair Value Inputs / Range |  |
Forward Market Price (per MWh) | $ / MWh | 3 | 3
Commodity contracts | Level 3 | Natural Gas Contracts | High |  |
Fair Value Inputs / Range |  |
Forward Market Price (per MWh) | $ / MWh | 17 | 40
Commodity contracts | Level 3 | Natural Gas Contracts | Weighted Average |  |
Fair Value Inputs / Range |  |
Forward Market Price (per MWh) | $ / MWh | 5 | 15
Commodity contracts | Level 3 | Power Contracts |  |
Assets |  |
Derivative assets | $ 2,144 | $ 392
Liabilities |  |
Commodity contracts | $ 762 | $ 121
Commodity contracts | Level 3 | Power Contracts | Low |  |
Fair Value Inputs / Range |  |
Forward Market Price (per MWh) | $ / MWh | 7 | 3
Commodity contracts | Level 3 | Power Contracts | High |  |
Fair Value Inputs / Range |  |
Forward Market Price (per MWh) | $ / MWh | 263 | 212
Commodity contracts | Level 3 | Power Contracts | Weighted Average |  |
Fair Value Inputs / Range |  |
Forward Market Price (per MWh) | $ / MWh | 56 | 35
Commodity contracts | Level 3 | FTRs |  |
Assets |  |
Derivative assets | $ 79 | $ 49
Liabilities |  |
Commodity contracts | $ 57 | $ 42
Commodity contracts | Level 3 | FTRs | Low |  |
Fair Value Inputs / Range |  |
Auction Prices (per MWh) | $ / MWh | (307) | (122)
Commodity contracts | Level 3 | FTRs | High |  |
Fair Value Inputs / Range |  |
Auction Prices (per MWh) | $ / MWh | 75 | 43
Commodity contracts | Level 3 | FTRs | Weighted Average |  |
Fair Value Inputs / Range |  |
Auction Prices (per MWh) | $ / MWh | 1 | 0

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