Non-Derivative Fair Value Measurements (Gains and Losses on Available-for-sale Debt Securities) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Debt Securities [Member]
Marketable Securities, Available-for-sale [Line Items]
Realized Gains	$ 10	$ 10	$ 18	$ 18
Realized Losses	39	33	76	59
Proceeds from sale or maturity of securities	592	498	1,020	1,220
Available for sale securities: Special Use Funds - Debt Securities [Member]
Marketable Securities, Available-for-sale [Line Items]
Unrealized gains	7		7		$ 4
Unrealized losses	221		221		285
Fair value	2,735		2,735		2,315
Florida Power & Light Company | Debt Securities [Member]
Marketable Securities, Available-for-sale [Line Items]
Realized Gains	9	7	15	14
Realized Losses	32	24	62	43
Proceeds from sale or maturity of securities	442	$ 259	740	$ 677
Florida Power & Light Company | Available for sale securities: Special Use Funds - Debt Securities [Member]
Marketable Securities, Available-for-sale [Line Items]
Unrealized gains	5		5		3
Unrealized losses	137		137		193
Fair value	$ 1,408		$ 1,408		$ 1,466