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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Debt Securities [Member]
Marketable Securities, Available-for-sale [Line Items]
Realized Gains	$ 12	$ 8	$ 31	$ 26
Realized Losses	64	41	140	100
Proceeds from sale or maturity of securities	781	681	1,801	1,901
Available for sale securities: Special Use Funds - Debt Securities [Member]
Marketable Securities, Available-for-sale [Line Items]
Unrealized gains	5		5		$ 4
Unrealized losses	260		260		285
Fair value	2,797		2,797		2,315
Florida Power & Light Company | Debt Securities [Member]
Marketable Securities, Available-for-sale [Line Items]
Realized Gains	11	6	27	20
Realized Losses	60	36	122	79
Proceeds from sale or maturity of securities	688	$ 324	1,428	$ 1,001
Florida Power & Light Company | Available for sale securities: Special Use Funds - Debt Securities [Member]
Marketable Securities, Available-for-sale [Line Items]
Unrealized gains	4		4		3
Unrealized losses	152		152		193
Fair value	$ 1,480		$ 1,480		$ 1,466