Derivatives Derivatives (Details 5-Non Hedges) (Details) - Jun. 30, 2015 - Not Designated as Hedging Instrument [Member] - USD ($) $ in Millions	Total	Total
Commodity [Member] | Sales and other operating revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (43)	$ (17)
Treasury Lock [Member] | Net interest and other [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 6