Rate And Regulatory Matters Rate and Regulatory Matters (Payments/Receipts Among The Utility Operating Companies) (Details) $ in Millions	Mar. 31, 2018 USD ($)
Entergy Arkansas [Member]
Payments (receipts) based on production costs	$ 6
Entergy New Orleans [Member]
Payments (receipts) based on production costs	2
Entergy Texas [Member]
Payments (receipts) based on production costs	$ (8)