Derivative Instruments Table - Schedule Of Derivative Assets And Liabilities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative asset, fair value, gross asset	$ 85	$ 4
Derivative liability, fair value, gross liability	16	28
Current | Derivatives Not Designated as Cash Flow Hedges | Commodity Derivatives
Derivative asset, fair value, gross asset	75	3
Derivative liability, fair value, gross liability	0	9
Long Term | Derivatives Not Designated as Cash Flow Hedges | Commodity Derivatives
Derivative asset, fair value, gross asset	10	1
Derivative liability, fair value, gross liability	0	0
Long Term | Derivatives Not Designated as Cash Flow Hedges | Embedded Derivatives
Derivative asset, fair value, gross asset	0	0
Derivative liability, fair value, gross liability	$ 16	$ 19