Subsequent Events Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended						3 Months Ended
	Sep. 30, 2013 Mid-America Midstream Gas Services, L.L.C. [Member]	Jul. 11, 2013 Haynesville Shale [Member] acre	Jun. 30, 2013 Haynesville Shale [Member] Mcfe	Jul. 31, 2013 Northern Eagle Ford Shale [Member]	Jul. 11, 2013 Northern Eagle Ford Shale [Member] acre	Jun. 30, 2013 Northern Eagle Ford Shale [Member] Boe	Sep. 30, 2013 Payment at Closing [Member] Haynesville Shale [Member]	Sep. 30, 2013 Payment at Closing [Member] Northern Eagle Ford Shale [Member]	Sep. 30, 2013 Payment Remaining [Member] Haynesville Shale [Member]	Sep. 30, 2013 Payment Remaining [Member] Northern Eagle Ford Shale [Member]	Jun. 30, 2013 Senior Notes	Jun. 30, 2013 7.625% Senior Notes Due 2013	Jul. 15, 2013 7.625% Senior Notes Due 2013 Senior Notes	Jun. 30, 2013 7.625% Senior Notes Due 2013 Senior Notes
Subsequent Event [Line Items]
Proceeds from Sale of Property, Plant, and Equipment	$ 306						$ 257	$ 617	$ 32	$ 70
Gas and Oil Area, Developed, Net		9,600			55,000
Proved Developed Reserves (Energy)			90,000,000			6,150
Number of Productive Oil and Gas Wells				120
Debt Instrument, Face Amount											$ 2,300		$ 247
Debt Instrument Interest Rate Stated Percentage												7.625%	7.625%	7.625%