Non-Derivative Fair Value Measurements (Gains and Losses on Available-for-sale Debt Securities) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Debt Securities [Member]
Marketable Securities, Available-for-sale [Line Items]
Realized Gains	$ 25	$ 21	$ 56	$ 40
Realized Losses	17	17	58	45
Proceeds from sale or maturity of securities	877	597	2,854	1,812
Available for sale securities: Special Use Funds - Debt Securities [Member]
Marketable Securities, Available-for-sale [Line Items]
Unrealized gains	64		64		$ 25
Unrealized losses	64		64		119
Fair value	1,139		1,139		2,224
Florida Power & Light Company | Debt Securities [Member]
Marketable Securities, Available-for-sale [Line Items]
Realized Gains	22	19	49	35
Realized Losses	14	14	45	33
Proceeds from sale or maturity of securities	494	$ 451	1,735	$ 1,390
Florida Power & Light Company | Available for sale securities: Special Use Funds - Debt Securities [Member]
Marketable Securities, Available-for-sale [Line Items]
Unrealized gains	36		36		16
Unrealized losses	30		30		61
Fair value	$ 661		$ 661		$ 1,160