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Derivative and Hedging Activities - Quantitative Disclosures Level 3 Table (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2016 USD ($)
Energy Related Derivative, Oil Trades [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Weighted Average Of Price Volatility Curve Percentage | 33.98%
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | $ (4)
Energy Related Derivative, Oil Trades [Member] | Minimum [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Weighted Average Of Price Volatility Curve Percentage | 26.58%
Energy Related Derivative, Oil Trades [Member] | Maximum [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Weighted Average Of Price Volatility Curve Percentage | 37.92%
Supply Contract [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Weighted Average Of Price Volatility Curve Percentage | 25.61%
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 317
Supply Contract [Member] | Minimum [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Weighted Average Of Price Volatility Curve Percentage | 20.72%
Supply Contract [Member] | Maximum [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Weighted Average Of Price Volatility Curve Percentage | 43.45%
Energy Related Derivative, Natural Gas Trades [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Weighted Average Of Price Volatility Curve Percentage | 32.54%
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | $ (44)
Energy Related Derivative, Natural Gas Trades [Member] | Minimum [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Weighted Average Of Price Volatility Curve Percentage | 19.69%
Energy Related Derivative, Natural Gas Trades [Member] | Maximum [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Weighted Average Of Price Volatility Curve Percentage | 47.43%

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