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Derivative and Hedging Activities - Quantitative Disclosures Level 3 (Details) - Energy related derivative - Natural gas $ in Millions | Dec. 31, 2020 USD ($)
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Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |
Fair value, asset | $ 8
Measurement input, price volatility | Minimum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |
Measurement input | 0.0024
Measurement input, price volatility | Maximum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |
Measurement input | 0.0071
Measurement input, price volatility | Weighted average |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |
Measurement input | 0.38

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