Non-Derivative Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2021
Fair value measurements made on a recurring basis [Member]
Cash equivalents:
Equity securities	$ 1,528	$ 961
Special use funds:
Equity securities	4,678	4,437
U.S. Government and municipal bonds	774	704
Corporate debt securities	721	722
Asset-backed securities	645	615
Other debt securities	21	20
Other investments:
Equity Securities	51	31
U.S. Government and Municipal Bonds	397	235
Corporate Debt Securities	463	233
Other Debt Securities	163	67
Level 1 | Fair value measurements made on a recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring [Line Items]
Restricted cash	41	69
Cash equivalents:
Equity securities	1,528	961
Special use funds:
Equity securities	2,141	2,062
U.S. Government and municipal bonds	716	641
Corporate debt securities	6	6
Asset-backed securities	0	0
Other debt securities	3	1
Other investments:
Equity Securities	50	30
U.S. Government and Municipal Bonds	279	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	2,537	2,375
U.S. Government and municipal bonds	58	63
Corporate debt securities	715	716
Asset-backed securities	645	615
Other debt securities	18	19
Other investments:
Equity Securities	1	1
U.S. Government and Municipal Bonds	118	118
Corporate Debt Securities	341	125
Other Debt Securities	152	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	122	108
Other Debt Securities	11	10
Florida Power & Light Company | Fair value measurements made on a recurring basis [Member]
Cash equivalents:
Equity securities	116	36
Special use funds:
Equity securities	3,087	2,905
U.S. Government and municipal bonds	612	534
Corporate debt securities	540	553
Asset-backed securities	467	473
Other debt securities	13	12
Other investments:
Equity Securities	10	9
Other Debt Securities	114	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	33	33
Cash equivalents:
Equity securities	116	36
Special use funds:
Equity securities	778	743
U.S. Government and municipal bonds	587	505
Corporate debt securities	6	6
Asset-backed securities	0	0
Other debt securities	3	1
Other investments:
Equity Securities	10	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	2,309	2,162
U.S. Government and municipal bonds	25	29
Corporate debt securities	534	547
Asset-backed securities	467	473
Other debt securities	10	11
Other investments:
Equity Securities	0	0
Other Debt Securities	114	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	$ 128	$ 203
NextEra Energy Transmission, LLC Subsidiary [Member] | GridLiance [Member]
Other investments:
Contingent consideration liabilities			$ 264