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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Debt Securities [Member]
Marketable Securities, Available-for-sale [Line Items]
Realized Gains	$ 21	$ 12	$ 40	$ 31
Realized Losses	17	64	45	140
Proceeds from sale or maturity of securities	597	781	1,812	1,801
Available for sale securities: Special Use Funds - Debt Securities [Member]
Marketable Securities, Available-for-sale [Line Items]
Unrealized gains	64		64		$ 41
Unrealized losses	85		85		134
Fair value	1,195		1,195		1,862
Florida Power & Light Company | Debt Securities [Member]
Marketable Securities, Available-for-sale [Line Items]
Realized Gains	19	11	35	27
Realized Losses	14	60	33	122
Proceeds from sale or maturity of securities	451	$ 688	1,390	$ 1,428
Florida Power & Light Company | Available for sale securities: Special Use Funds - Debt Securities [Member]
Marketable Securities, Available-for-sale [Line Items]
Unrealized gains	37		37		31
Unrealized losses	44		44		71
Fair value	$ 639		$ 639		$ 872