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Derivative and Hedging Activities - Quantitative Disclosures Level 3 Table (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2015
USD ($)
Energy Related Derivative, Oil Trades [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average Of Price Volatility Curve Percentage 31.70%
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset 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 23.69%
Energy Related Derivative, Oil Trades [Member] | Maximum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average Of Price Volatility Curve Percentage 37.51%
Other Contract [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average Of Price Volatility Curve Percentage 23.82%
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 291
Other Contract [Member] | Minimum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average Of Price Volatility Curve Percentage 20.22%
Other Contract [Member] | Maximum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average Of Price Volatility Curve Percentage 44.86%
Energy Related Derivative, Natural Gas Trades [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average Of Price Volatility Curve Percentage 31.31%
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value $ (79)
Energy Related Derivative, Natural Gas Trades [Member] | Minimum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average Of Price Volatility Curve Percentage 19.76%
Energy Related Derivative, Natural Gas Trades [Member] | Maximum [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Weighted Average Of Price Volatility Curve Percentage 61.06%