Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings (Book Value And The Fair Value Of Long-Term Debt) (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
Short-term Debt [Line Items]
Long-term Debt, Fair Value	$ 13,558,411,000	[1],[2]	$ 13,607,242,000	[1],[3]
Long-term Debt, Book Value	13,204,417,000		13,399,484,000
Notes payable to power authority	80,000,000		80,000,000
Entergy Arkansas [Member]
Short-term Debt [Line Items]
Long-term Debt, Fair Value	2,567,341,000	[1],[2]	2,517,633,000	[1],[3]
Long-term Debt, Book Value	2,671,406,000		2,671,343,000
Long term DOE obligations	181,000,000		181,000,000
Entergy Gulf States Louisiana [Member]
Short-term Debt [Line Items]
Long-term Debt, Fair Value	1,753,434,000	[1],[2]	1,743,143,000	[1],[3]
Long-term Debt, Book Value	1,663,879,000		1,622,817,000
Entergy Louisiana [Member]
Short-term Debt [Line Items]
Long-term Debt, Fair Value	3,477,366,000	[1],[2]	3,447,404,000	[1],[3]
Long-term Debt, Book Value	3,340,585,000		3,356,579,000
Capital Lease Obligations	112,000,000		128,000,000
Entergy Mississippi [Member]
Short-term Debt [Line Items]
Long-term Debt, Fair Value	1,111,044,000	[1],[2]	1,102,741,000	[1],[3]
Long-term Debt, Book Value	1,058,869,000		1,058,838,000
Entergy New Orleans [Member]
Short-term Debt [Line Items]
Long-term Debt, Fair Value	229,573,000	[1],[2]	226,349,000	[1],[3]
Long-term Debt, Book Value	225,875,000		225,866,000
Entergy Texas [Member]
Short-term Debt [Line Items]
Long-term Debt, Fair Value	1,611,345,000	[1],[2]	1,629,124,000	[1],[3]
Long-term Debt, Book Value	1,456,274,000		1,478,931,000
System Energy [Member]
Short-term Debt [Line Items]
Long-term Debt, Fair Value	683,191,000	[1],[2]	677,475,000	[1],[3]
Long-term Debt, Book Value	699,429,000		710,806,000
Capital Lease Obligations	$ 39,000,000		$ 51,000,000

[1] Fair values are classified as Level 2 in the fair value hierarchy discussed in Note 8 to the financial statements and are based on prices derived from inputs such as benchmark yields and reported trades.

[2] The values exclude lease obligations of $112 million at Entergy Louisiana and $39 million at System Energy, long-term DOE obligations of $181 million at Entergy Arkansas, and the note payable to NYPA of $80 million at Entergy, and include debt due within one year.

[3] The values exclude lease obligations of $128 million at Entergy Louisiana and $51 million at System Energy, long-term DOE obligations of $181 million at Entergy Arkansas, and the note payable to NYPA of $80 million at Entergy, and include debt due within one year.