Non-Derivative Fair Value Measurements (Gains and Losses) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities[Line Items]
Decommissioning Fund Investments, Fair Value	$ 9,799	$ 8,697
Debt securities, amortized cost	$ 3,720	3,329
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity	9 years
Special Use Funds Other Investments Weighted Average Maturity	8 years
Debt Securities [Member]
Schedule of Available-for-sale Securities[Line Items]
Realized gains	$ 53	40	$ 30
Realized losses	86	169	141
Proceeds from sale and maturity of Available-for-sale Securities	2,874	2,380	2,207
Available for sale securities: Special Use Funds - Debt Securities [Member]
Schedule of Available-for-sale Securities[Line Items]
Unrealized gains	25	41
Unrealized losses	119	134
Fair Value	2,224	1,862
FPL [Member]
Schedule of Available-for-sale Securities[Line Items]
Decommissioning Fund Investments, Fair Value	6,874	6,049
Debt securities, amortized cost	$ 1,780	1,693
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity	9 years
FPL [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities[Line Items]
Realized gains	$ 46	35	24
Realized losses	71	147	111
Proceeds from sale and maturity of Available-for-sale Securities	2,274	1,921	1,371
FPL [Member] \| Available for sale securities: Special Use Funds - Debt Securities [Member]
Schedule of Available-for-sale Securities[Line Items]
Unrealized gains	16	31
Unrealized losses	61	71
Fair Value	1,160	872
Equity Securities [Member]
Schedule of Available-for-sale Securities[Line Items]
marketable securities, unrealized gain (loss) recognized during the period on securities still held	917	881	(1,028)
Equity Securities [Member] \| FPL [Member]
Schedule of Available-for-sale Securities[Line Items]
marketable securities, unrealized gain (loss) recognized during the period on securities still held	$ 668	$ 598	$ (677)

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This item represents the weighted-average maturity of debt securities (in years) in nuclear decommissioning funds at the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

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The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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