Rate And Regulatory Matters (Payments or Receipts Among Utility Operating Companies Production Cost Based) (Details) (USD $) In Millions, unless otherwise specified	May 31, 2014
Entergy Gulf States [Member]
Payments (receipts) based on production costs	$ 0
Entergy Louisiana [Member]
Payments (receipts) based on production costs	0
Entergy Mississippi [Member]
Payments (receipts) based on production costs	0
Entergy New Orleans [Member]
Payments (receipts) based on production costs	(15)
Entergy Texas [Member]
Payments (receipts) based on production costs	$ 15