Commitments and Contingencies Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	Aug. 31, 2019	Sep. 30, 2019	Sep. 30, 2018
Loss Contingencies [Line Items]
Litigation proceeds for reimbursement of spent nuclear fuel storage costs		$ 2,369	$ 0
Entergy Louisiana [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded from Other Party	$ 19,000
Litigation proceeds for reimbursement of spent nuclear fuel storage costs	12,000
Damages awarded for previously recorded operation and maintenance	5,000
Damages awarded for previously recorded nuclear fuel expense	$ 2,000
System Energy [Member]
Loss Contingencies [Line Items]
Minimum Rate Of Equity Capital		35.00%