Non-Derivative Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Fair value measurements made on a recurring basis [Member]
Cash equivalents:
Equity securities	$ 1,456	$ 1,972
Special use funds:
Equity securities	6,077	5,290
U.S. Government and municipal bonds	766	757
Corporate debt securities	655	623
Asset-backed securities	905	822
Other debt securities	15	20
Other investments:
Equity Securities	52	50
U.S. Government and Municipal Bonds	192	291
Corporate Debt Securities	873	523
Other Debt Securities	340	211
Level 1 | Fair value measurements made on a recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring [Line Items]
Restricted cash	108	34
Cash equivalents:
Equity securities	1,456	1,972
Special use funds:
Equity securities	2,626	2,349
U.S. Government and municipal bonds	703	700
Corporate debt securities	2	3
Asset-backed securities	0	0
Other debt securities	0	6
Other investments:
Equity Securities	51	50
U.S. Government and Municipal Bonds	189	288
Corporate Debt Securities	0	0
Other Debt Securities	0	0
Level 2 | Fair value measurements made on a recurring basis [Member]
Cash equivalents:
Equity securities	0	0
Special use funds:
Equity securities	3,246	2,742
U.S. Government and municipal bonds	63	57
Corporate debt securities	653	620
Asset-backed securities	905	822
Other debt securities	15	14
Other investments:
Equity Securities	1	0
U.S. Government and Municipal Bonds	3	3
Corporate Debt Securities	731	408
Other Debt Securities	287	196
Level 3 | Fair value measurements made on a recurring basis [Member]
Cash equivalents:
Equity securities	0	0
Special use funds:
Equity securities	205	199
U.S. Government and municipal bonds	0	0
Corporate debt securities	0	0
Asset-backed securities	0	0
Other debt securities	0	0
Other investments:
Equity Securities	0	0
U.S. Government and Municipal Bonds	0	0
Corporate Debt Securities	142	115
Other Debt Securities	53	15
Florida Power & Light Company | Fair value measurements made on a recurring basis [Member]
Cash equivalents:
Equity securities	113	12
Special use funds:
Equity securities	4,133	3,536
U.S. Government and municipal bonds	602	583
Corporate debt securities	479	458
Asset-backed securities	684	606
Other debt securities	9	11
Other investments:
Equity Securities	9	9
Florida Power & Light Company | Level 1 | Fair value measurements made on a recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring [Line Items]
Restricted cash	100	11
Cash equivalents:
Equity securities	113	12
Special use funds:
Equity securities	1,009	863
U.S. Government and municipal bonds	561	556
Corporate debt securities	1	3
Asset-backed securities	0	0
Other debt securities	0	5
Other investments:
Equity Securities	9	9
Florida Power & Light Company | Level 2 | Fair value measurements made on a recurring basis [Member]
Cash equivalents:
Equity securities	0	0
Special use funds:
Equity securities	2,919	2,474
U.S. Government and municipal bonds	41	27
Corporate debt securities	478	455
Asset-backed securities	684	606
Other debt securities	9	6
Other investments:
Equity Securities	0	0
Florida Power & Light Company | Level 3 | Fair value measurements made on a recurring basis [Member]
Cash equivalents:
Equity securities	0	0
Special use funds:
Equity securities	205	199
U.S. Government and municipal bonds	0	0
Corporate debt securities	0	0
Asset-backed securities	0	0
Other debt securities	0	0
Other investments:
Equity Securities	0	0
NextEra Energy Transmission, LLC Subsidiary [Member]
Other investments:
Contingent consideration liabilities	$ 126	$ 126