Fair Value Measures FV of Partnership's Derivative Assets And Liabilities (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Fair Value Measurement, Assets	$ 2	$ 4
Fair Value Measurement, Liabilities	40	28
Derivative Liability, Fair Value, Gross Liability	40	28
Significant Observable Inputs (Level 2)
Fair Value Measurement, Assets	2	4
Fair Value Measurement, Liabilities	11	9
Unobservable Inputs (Level 3)
Fair Value Measurement, Assets	0	0
Fair Value Measurement, Liabilities	29	19
Natural Gas Transportation
Fair Value Measurement, Assets	1	2
Fair Value Measurement, Liabilities	5	4
Natural Gas Transportation | Significant Observable Inputs (Level 2)
Fair Value Measurement, Assets	1	2
Fair Value Measurement, Liabilities	5	4
Natural Gas Transportation | Unobservable Inputs (Level 3)
Fair Value Measurement, Assets	0	0
Fair Value Measurement, Liabilities	0	0
NGLs
Fair Value Measurement, Assets	1	2
Fair Value Measurement, Liabilities	2	4
NGLs | Significant Observable Inputs (Level 2)
Fair Value Measurement, Assets	1	2
Fair Value Measurement, Liabilities	2	4
NGLs | Unobservable Inputs (Level 3)
Fair Value Measurement, Assets	0	0
Fair Value Measurement, Liabilities	0	0
Condensate
Fair Value Measurement, Liabilities	4	1
Condensate | Significant Observable Inputs (Level 2)
Fair Value Measurement, Liabilities	4	1
Condensate | Unobservable Inputs (Level 3)
Fair Value Measurement, Liabilities	0	0
Embedded Derivatives in Series A Preferred Units [Member]
Embedded Derivatives in Series A Preferred Units	29	19
Embedded Derivatives in Series A Preferred Units [Member] | Significant Observable Inputs (Level 2)
Embedded Derivatives in Series A Preferred Units	0	0
Embedded Derivatives in Series A Preferred Units [Member] | Unobservable Inputs (Level 3)
Embedded Derivatives in Series A Preferred Units	$ 29	$ 19