Non-Derivative Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2021
Fair value measurements made on a recurring basis [Member]
Cash equivalents:
Equity securities	$ 677	$ 961
Special use funds:
Equity securities	4,757	4,437
U.S. Government and municipal bonds	742	704
Corporate debt securities	554	722
Asset-backed securities	775	615
Other debt securities	12	20
Other investments:
Equity Securities	49	31
U.S. Government and Municipal Bonds	556	235
Corporate Debt Securities	472	233
Other Debt Securities	205	67
Level 1 | Fair value measurements made on a recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring [Line Items]
Restricted cash	20	69
Cash equivalents:
Equity securities	677	961
Special use funds:
Equity securities	2,237	2,062
U.S. Government and municipal bonds	699	641
Corporate debt securities	0	6
Asset-backed securities	0	0
Other debt securities	0	1
Other investments:
Equity Securities	49	30
U.S. Government and Municipal Bonds	291	117
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	2,520	2,375
U.S. Government and municipal bonds	43	63
Corporate debt securities	554	716
Asset-backed securities	775	615
Other debt securities	12	19
Other investments:
Equity Securities	0	1
U.S. Government and Municipal Bonds	265	118
Corporate Debt Securities	358	125
Other Debt Securities	190	57
Level 3 | Fair value measurements made on a recurring basis [Member]
Cash equivalents:
Equity securities	0	0
Special use funds:
Equity securities	0	0
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	114	108
Other Debt Securities	15	10
Florida Power & Light Company | Fair value measurements made on a recurring basis [Member]
Cash equivalents:
Equity securities	36	36
Special use funds:
Equity securities	3,183	2,905
U.S. Government and municipal bonds	587	534
Corporate debt securities	389	553
Asset-backed securities	582	473
Other debt securities	5	12
Other investments:
Equity Securities	9	9
Other Debt Securities	262	114
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	33
Cash equivalents:
Equity securities	36	36
Special use funds:
Equity securities	903	743
U.S. Government and municipal bonds	572	505
Corporate debt securities	0	6
Asset-backed securities	0	0
Other debt securities	0	1
Other investments:
Equity Securities	9	9
Other Debt Securities	0	0
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	2,280	2,162
U.S. Government and municipal bonds	15	29
Corporate debt securities	389	547
Asset-backed securities	582	473
Other debt securities	5	11
Other investments:
Equity Securities	0	0
Other Debt Securities	262	114
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	0	0
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
Other Debt Securities	0	0
NextEra Energy Transmission, LLC Subsidiary [Member]
Other investments:
Contingent consideration liabilities	$ 123	$ 203
NextEra Energy Transmission, LLC Subsidiary [Member] | GridLiance [Member]
Other investments:
Contingent consideration liabilities			$ 264