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Derivative and Hedging Activities - Quantitative Disclosures Level 3 (Details) - Energy related derivative $ in Millions | Jun. 30, 2019 USD ($)
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Oil |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |
Fair value, measurement with unobservable inputs reconciliations, recurring basis, asset value | $ 23
Natural Gas |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |
Fair value, measurement with unobservable inputs reconciliations, recurring basis, liability value | $ (1)
Price volatility | Oil | Weighted average |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |
Measurement input | 0.2779
Price volatility | Oil | Minimum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |
Measurement input | 0.2162
Price volatility | Oil | Maximum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |
Measurement input | 0.3820
Price volatility | Natural Gas | Weighted average |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |
Measurement input | 0.3318
Price volatility | Natural Gas | Minimum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |
Measurement input | 0.1994
Price volatility | Natural Gas | Maximum |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |
Measurement input | 1.4547

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