Non-Derivative Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fair value measurements made on a recurring basis [Member]
Cash equivalents:
Equity securities	$ 684	$ 1,972
Special use funds:
Equity securities	5,709	5,290
U.S. Government and municipal bonds	735	757
Corporate debt securities	643	623
Asset-backed securities	825	822
Other debt securities	14	20
Other investments:
Equity Securities	53	50
U.S. Government and Municipal Bonds	249	291
Corporate Debt Securities	628	523
Other Debt Securities	230	211
Level 1 | Fair value measurements made on a recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring [Line Items]
Restricted cash	19	34
Cash equivalents:
Equity securities	684	1,972
Special use funds:
Equity securities	2,494	2,349
U.S. Government and municipal bonds	690	700
Corporate debt securities	1	3
Asset-backed securities	0	0
Other debt securities	0	6
Other investments:
Equity Securities	52	50
U.S. Government and Municipal Bonds	246	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	2,981	2,742
U.S. Government and municipal bonds	45	57
Corporate debt securities	642	620
Asset-backed securities	825	822
Other debt securities	14	14
Other investments:
Equity Securities	1	0
U.S. Government and Municipal Bonds	3	3
Corporate Debt Securities	494	408
Other Debt Securities	191	196
Level 3 | Fair value measurements made on a recurring basis [Member]
Cash equivalents:
Equity securities	0	0
Special use funds:
Equity securities	234	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	134	115
Other Debt Securities	39	15
Florida Power & Light Company | Fair value measurements made on a recurring basis [Member]
Cash equivalents:
Equity securities	11	12
Special use funds:
Equity securities	3,832	3,536
U.S. Government and municipal bonds	573	583
Corporate debt securities	468	458
Asset-backed securities	607	606
Other debt securities	6	11
Other investments:
Equity Securities	10	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	11	11
Cash equivalents:
Equity securities	11	12
Special use funds:
Equity securities	913	863
U.S. Government and municipal bonds	550	556
Corporate debt securities	0	3
Asset-backed securities	0	0
Other debt securities	0	5
Other investments:
Equity Securities	10	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	2,685	2,474
U.S. Government and municipal bonds	23	27
Corporate debt securities	468	455
Asset-backed securities	607	606
Other debt securities	6	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	234	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	$ 125	$ 126