Rate and Regulatory Matters (Details) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011
Entergy Arkansas
Payments/receipts among the Utility operating companies to achieve rough production cost equalization
Payments based on previous year production costs	$ 77
Entergy Gulf States Louisiana [Member]
Payments/receipts among the Utility operating companies to achieve rough production cost equalization
Receipts based on previous year production costs	(12)
Entergy Mississippi [Member]
Payments/receipts among the Utility operating companies to achieve rough production cost equalization
Receipts based on previous year production costs	(40)
Entergy New Orleans
Payments/receipts among the Utility operating companies to achieve rough production cost equalization
Receipts based on previous year production costs	$ (225)