Guarantee of Securities of Subsidiaries Details (Details) (USD $) In Millions, unless otherwise specified			6 Months Ended
	Jun. 30, 2014 Subsidiaries [Member] Copano Energy, LLC [Member]	Dec. 31, 2013 Subsidiaries [Member] Copano Energy, LLC [Member]	Jun. 30, 2014 Parent Company [Member]	Jun. 30, 2013 Parent Company [Member]	Jun. 30, 2014 Subsidiary Issuer [Member]	Jun. 30, 2013 Subsidiary Issuer [Member]	Jun. 30, 2014 Non-Guarantor Subsidiaries [Member]	Jun. 30, 2013 Non-Guarantor Subsidiaries [Member]	Jun. 30, 2014 Consolidation, Eliminations [Member]	Jun. 30, 2013 Consolidation, Eliminations [Member]	Jun. 30, 2014 Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]	Jun. 30, 2013 Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]
Funding (to) from Affiliates			$ (1,571)	$ (3,690)	$ 72	$ (501)	$ 420	$ (1,234)	$ 1,079	$ 5,425	$ 0	$ 0
Notes Payable	$ 332	$ 332