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Fair Value of Financial Instruments - Derivative Fair Value Measurements (Details) $ in Millions | Sep. 30, 2020 USD ($) $ / MWh | Dec. 31, 2019 USD ($) $ / MWh
--- | --- | ---
Liabilities |  |
Derivative liabilities | $ 813 | $ 1,103
Level 3 |  |
Liabilities |  |
Derivative liabilities | 175 | 155
Commodity contracts |  |
Assets |  |
Derivative assets | 893 | 1,170
Liabilities |  |
Derivative liabilities | 813 | 1,103
Commodity contracts | Level 3 |  |
Assets |  |
Derivative assets | 227 | 193
Liabilities |  |
Derivative liabilities | 175 | 155
Commodity contracts | Level 3 | Power Contracts |  |
Assets |  |
Derivative assets | 196 | 151
Liabilities |  |
Derivative liabilities | $ 167 | $ 139
Commodity contracts | Level 3 | Power Contracts | Low |  |
Fair Value Inputs / Range |  |
Forward Market Price (per MWh) | $ / MWh | 10 | 8
Commodity contracts | Level 3 | Power Contracts | High |  |
Fair Value Inputs / Range |  |
Forward Market Price (per MWh) | $ / MWh | 116 | 218
Commodity contracts | Level 3 | Power Contracts | Weighted Average |  |
Fair Value Inputs / Range |  |
Forward Market Price (per MWh) | $ / MWh | 24 | 24
Commodity contracts | Level 3 | FTRs |  |
Assets |  |
Derivative assets | $ 31 | $ 42
Liabilities |  |
Derivative liabilities | $ 8 | $ 16
Commodity contracts | Level 3 | FTRs | Low |  |
Fair Value Inputs / Range |  |
Auction Prices (per MWh) | $ / MWh | (50) | (105)
Commodity contracts | Level 3 | FTRs | High |  |
Fair Value Inputs / Range |  |
Auction Prices (per MWh) | $ / MWh | 43 | 213
Commodity contracts | Level 3 | FTRs | Weighted Average |  |
Fair Value Inputs / Range |  |
Auction Prices (per MWh) | $ / MWh | 0 | 0

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