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Derivative and Hedging Activities - Quantitative Disclosures Level 3 Table (Details)
$ in Millions
9 Months Ended
Sep. 30, 2016
USD ($)
Energy Related Derivative, Oil Trades [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average Of Price Volatility Curve Percentage 29.04%
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value $ (2)
Energy Related Derivative, Oil Trades [Member] | Minimum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average Of Price Volatility Curve Percentage 21.09%
Energy Related Derivative, Oil Trades [Member] | Maximum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average Of Price Volatility Curve Percentage 31.73%
Energy Related Derivative, Natural Gas Trades [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average Of Price Volatility Curve Percentage 25.31%
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value $ (28)
Energy Related Derivative, Natural Gas Trades [Member] | Minimum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average Of Price Volatility Curve Percentage 21.20%
Energy Related Derivative, Natural Gas Trades [Member] | Maximum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average Of Price Volatility Curve Percentage 59.56%