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Fair Value of Financial Instruments - Derivative Fair Value Measurements (Details) $ in Millions | Mar. 31, 2022 USD ($) $ / MWh | Dec. 31, 2021 USD ($) $ / MWh
--- | --- | ---
Liabilities |  |
Commodity contracts | $ 8,053 | $ 4,799
Level 3 |  |
Liabilities |  |
Commodity contracts | 191 | 164
Commodity contracts |  |
Assets |  |
Derivative assets | 12,650 | 7,139
Liabilities |  |
Commodity contracts | 8,049 | 4,798
Commodity contracts | Level 3 |  |
Assets |  |
Derivative assets | 719 | 457
Liabilities |  |
Commodity contracts | 191 | 164
Commodity contracts | Level 3 | Natural Gas Contracts |  |
Assets |  |
Derivative assets |  | 16
Liabilities |  |
Commodity contracts |  | $ 1
Commodity contracts | Level 3 | Natural Gas Contracts | Low |  |
Fair Value Inputs / Range |  |
Forward Market Price (per MWh) | $ / MWh |  | 3
Commodity contracts | Level 3 | Natural Gas Contracts | High |  |
Fair Value Inputs / Range |  |
Forward Market Price (per MWh) | $ / MWh |  | 40
Commodity contracts | Level 3 | Natural Gas Contracts | Weighted Average |  |
Fair Value Inputs / Range |  |
Forward Market Price (per MWh) | $ / MWh |  | 15
Commodity contracts | Level 3 | Power Contracts |  |
Assets |  |
Derivative assets | 676 | $ 392
Liabilities |  |
Commodity contracts | $ 153 | $ 121
Commodity contracts | Level 3 | Power Contracts | Low |  |
Fair Value Inputs / Range |  |
Forward Market Price (per MWh) | $ / MWh | 6 | 3
Commodity contracts | Level 3 | Power Contracts | High |  |
Fair Value Inputs / Range |  |
Forward Market Price (per MWh) | $ / MWh | 278 | 212
Commodity contracts | Level 3 | Power Contracts | Weighted Average |  |
Fair Value Inputs / Range |  |
Forward Market Price (per MWh) | $ / MWh | 47 | 35
Commodity contracts | Level 3 | FTRs |  |
Assets |  |
Derivative assets | $ 43 | $ 49
Liabilities |  |
Commodity contracts | $ 38 | $ 42
Commodity contracts | Level 3 | FTRs | Low |  |
Fair Value Inputs / Range |  |
Auction Prices (per MWh) | $ / MWh | (105) | (122)
Commodity contracts | Level 3 | FTRs | High |  |
Fair Value Inputs / Range |  |
Auction Prices (per MWh) | $ / MWh | 43 | 43
Commodity contracts | Level 3 | FTRs | Weighted Average |  |
Fair Value Inputs / Range |  |
Auction Prices (per MWh) | $ / MWh | 0 | 0

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