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Equity Distribution Sales Agreement, Maximum Aggregate Gross Sales Price

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Forward Sale Agreement, Forward Sellers Fees

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Forward sale agreement, general issuance costs

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Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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The per share price of the Company's stock at which the contract holder of the freestanding contract has the right to purchase or sell the Company's stock at a future date.

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Amount that would be paid upon settlement of forward contract indexed to equity.

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Number of shares as a settlement alternative for each freestanding forward contract.

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Maximum number of shares that could be issued to settle forward contract indexed to equity.

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Dividends received on equity and other investments during the current period.

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Number of new stock issued during the period.

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Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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Common Equity (Narrative) (Details) $ / shares in Units, $ in Thousands												1 Months Ended									2 Months Ended	6 Months Ended	12 Months Ended
	Feb. 02, 2026 USD ($) $ / shares shares	Oct. 31, 2024	Sep. 25, 2024 USD ($) $ / shares shares	Sep. 10, 2024 USD ($) $ / shares shares	Aug. 15, 2024 USD ($) shares	May 15, 2024 USD ($) shares	Mar. 15, 2024 USD ($) shares	Dec. 05, 2023 $ / shares	Nov. 30, 2023 USD ($) $ / shares shares	Jun. 28, 2023 USD ($) shares	Jun. 06, 2023 USD ($) shares	Oct. 31, 2025 USD ($) $ / shares shares	May 31, 2025 USD ($) $ / shares shares	Mar. 31, 2025 USD ($) $ / shares shares	Aug. 31, 2024 USD ($) shares	Jun. 30, 2024 USD ($) shares	May 31, 2024 USD ($) shares	Mar. 31, 2024 USD ($) shares	Dec. 31, 2023 USD ($) shares	Nov. 30, 2023 USD ($) shares	Dec. 31, 2023 USD ($) shares	Oct. 31, 2025 USD ($) shares	Dec. 31, 2025 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Feb. 28, 2025 USD ($)	Oct. 31, 2010 USD ($)
Common Stock, Dividends, Per Share, Declared \| $ / shares																							$ 2.44	$ 2.30	$ 2.17
Stock Repurchase Program, Authorized Amount																							$ 500,000				$ 500,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount																							$ 350,000
Common Stock, Shares Authorized \| shares																							998,000,000	998,000,000
Common Stock, Par or Stated Value Per Share \| $ / shares																							$ 0.01	$ 0.01
Stockholders' Equity Note, Stock Split, Conversion Ratio		2
Dividends, Common Stock, Cash																							$ 1,074,151	$ 981,659	$ 918,193
System Energy [Member]
Common Stock, Shares Authorized \| shares																							1,000,000	1,000,000
Dividends, Common Stock, Cash																							$ 50,000	$ 108,000	$ 170,000
Forward Contracts [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount \| shares																							676,056	2,373,682	3,525,418
Employee Stock Option
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount \| shares																							335,625	1,857,250	2,359,923
Subsidiaries [Member]
Proceeds from Dividends Received																							$ 52,000	$ 484,000	$ 189,000
Equity Distribution Program [Member]
Forward Contract Indexed to Equity, Settlement, Cash, Amount																							2,800,000
Equity Distribution Sales Agreement, Maximum Aggregate Gross Sales Price																							$ 4,500,000
Equity Distribution Sales Agreement Increase in Aggregate Gross Sales Price																										$ 1,500,000
Equity Distribution Program [Member] \| Common Stock [Member]
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share \| $ / shares			$ 64.22	$ 60.14				$ 48.74	$ 50.69			$ 58.30	$ 51.78	$ 84.77
Forward Contract Indexed to Equity, Settlement, Cash, Amount									$ 47,786			$ 331,873	$ 805,669						$ 83,312	$ 47,786	$ 83,312	$ 331,873			$ 83,312
Forward Contract Indexed to Equity, Settlement, Number of Shares \| shares									936,604			5,692,604	15,560,474						1,706,234	936,604	1,706,234	5,692,604			1,706,234
Forward Sale Agreement, Forward Sellers Fees			$ 577	$ 1,863	$ 1,304	$ 1,424	$ 293			$ 374	$ 105			$ 2,322	$ 2,055	$ 1,145	$ 1,344	$ 1,192	$ 2,805	$ 840
General Issuance Costs																					$ 400	$ 1,400
Stock Issued During Period, Shares, New Issues \| shares																							0	0	0
Forward Contract Indexed to Issuer's Equity, Shares \| shares			888,756	3,069,070	2,225,832	2,556,832	569,844			730,614	205,990			2,713,790	3,466,772	2,140,006	2,466,470	2,320,830	5,506,492	1,706,234
Equity Distribution Program [Member] \| Common Stock [Member] \| Subsequent Event [Member]
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share \| $ / shares	$ 75.05
Forward Contract Indexed to Equity, Settlement, Cash, Amount	$ 346,000
General Issuance Costs	$ 200
Forward Contract Indexed to Issuer's Equity, Shares \| shares	4,613,790
Equity Offering \| Common Stock [Member]
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share \| $ / shares														$ 81.87
Forward Contract Indexed to Equity, Settlement, Number of Shares \| shares																							2,000,000.0
Forward Contract Indexed to Issuer's Equity, Shares \| shares														17,800,000