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Derivative Instruments and Hedging Activities (Fair Values) (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | $ 840 | $ 693
Liability value | 619 | 539
Not Designated as Hedging Instrument |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 840 | 693
Liability value | 619 | 539
Not Designated as Hedging Instrument | Current Assets | Energy Commodities, net |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 680 | 562
Not Designated as Hedging Instrument | Noncurrent Assets | Energy Commodities, net |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Asset value | 160 | 131
Not Designated as Hedging Instrument | Current Liabilities | Energy Commodities, net |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | 492 | 431
Not Designated as Hedging Instrument | Noncurrent Liabilities | Energy Commodities, net |  |
Fair Values by Balance Sheet Location [Abstract] |  |
Liability value | $ 127 | $ 108

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