Segment Information - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) Segment	Sep. 30, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			2
Total Revenues	$ 2,893,000,000	$ 5,703,000,000	$ 8,686,000,000	$ 15,901,000,000
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total Revenues	0	0	0	0
Marketing, Gathering And Compression [Member]
Segment Reporting Information [Line Items]
Total Revenues	2,013,000,000	3,362,000,000	5,993,000,000	9,543,000,000
Marketing, Gathering And Compression [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total Revenues	(1,046,000,000)	(2,150,000,000)	(3,483,000,000)	(6,746,000,000)
Oilfield Services [Member]
Segment Reporting Information [Line Items]
Total Revenues	0	0	0	516,000,000
Oilfield Services [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total Revenues	$ 0	$ 0	$ 0	$ (544,000,000)