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Derivative and Hedging Activities - Quantitative Disclosures Level 3 Table (Details) - Energy Related Derivative [Member] $ in Millions | 3 Months Ended
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Mar. 31, 2017 USD ($)
Oil [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Weighted Average Of Price Volatility Curve Percentage | 22.97%
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 0
Oil [Member] | Minimum [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Weighted Average Of Price Volatility Curve Percentage | 18.22%
Oil [Member] | Maximum [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Weighted Average Of Price Volatility Curve Percentage | 24.10%
Natural Gas [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Weighted Average Of Price Volatility Curve Percentage | 38.10%
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 3
Natural Gas [Member] | Minimum [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Weighted Average Of Price Volatility Curve Percentage | 21.37%
Natural Gas [Member] | Maximum [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Weighted Average Of Price Volatility Curve Percentage | 52.18%

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