Non-Derivative Fair Value Measurements (Gains and Losses) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities[Line Items]
Decommissioning Fund Investments, Fair Value	$ 8,697	$ 7,495
Special Use Funds Storm Fund Assets	1	1
Debt securities, amortized cost	$ 3,329	2,858
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity	9 years
Special Use Funds Other Investments Weighted Average Maturity	6 years
Debt Securities [Member]
Schedule of Available-for-sale Securities[Line Items]
Realized gains	$ 40	30	$ 78
Realized losses	169	141	73
Proceeds from sale and maturity of Available-for-sale Securities	2,380	2,207	1,831
Available for sale securities: Special Use Funds - Debt Securities [Member]
Schedule of Available-for-sale Securities[Line Items]
Unrealized gains	41	4
Unrealized losses	134	285
Fair Value	1,862	2,315
FPL [Member]
Schedule of Available-for-sale Securities[Line Items]
Decommissioning Fund Investments, Fair Value	6,049	5,220
Special Use Funds Storm Fund Assets	1	1
Debt securities, amortized cost	$ 1,693	1,873
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	$ 35	24	59
Realized losses	147	111	57
Proceeds from sale and maturity of Available-for-sale Securities	1,921	1,371	1,330
FPL [Member] \| Available for sale securities: Special Use Funds - Debt Securities [Member]
Schedule of Available-for-sale Securities[Line Items]
Unrealized gains	31	3
Unrealized losses	71	193
Fair Value	872	1,466
Equity Securities [Member]
Schedule of Available-for-sale Securities[Line Items]
marketable securities, unrealized gain (loss) recognized during the period on securities still held	881	(1,028)	981
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	$ 598	$ (677)	$ 652

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Storm fund assets held by a regulated entity to pay for storm-related costs as incurred in future periods.

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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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