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Derivative and Hedging Activities - Quantitative Disclosures Level 3 Table (Details) - Energy related derivative [Member] $ in Millions | Sep. 30, 2018 USD ($)
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Oil [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |
Fair value, measurement with unobservable inputs reconciliations, recurring basis, liability value | $ (8)
Natural gas [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |
Fair value, measurement with unobservable inputs reconciliations, recurring basis, asset value | $ 3
Measurement Input, Price Volatility [Member] | Oil [Member] | Weighted average [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |
Measurement input | 0.2497
Measurement Input, Price Volatility [Member] | Oil [Member] | Minimum [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |
Measurement input | 0.1909
Measurement Input, Price Volatility [Member] | Oil [Member] | Maximum [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |
Measurement input | 0.2860
Measurement Input, Price Volatility [Member] | Natural gas [Member] | Weighted average [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |
Measurement input | 0.1624
Measurement Input, Price Volatility [Member] | Natural gas [Member] | Minimum [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |
Measurement input | 0.1560
Measurement Input, Price Volatility [Member] | Natural gas [Member] | Maximum [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |
Measurement input | 0.6208

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