Non-Derivative Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Other Investments [Abstract]
Restricted Cash and Cash Equivalents, Statement of Financial Position [Extensible Enumeration]	Other	Other
Fair Value, Recurring [Member]
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	$ 961	$ 176
Special use funds [Abstract]
Equity securities	4,437	5,511
U.S. Government and municipal bonds	704	845
Corporate debt securities	722	962
Asset-backed securities	615	663
Other debt securities	20	35
Other Investments [Abstract]
Equity securities	31	72
Debt securities	535	285
Level 1 | Fair Value, Recurring [Member]
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	961	176
Restricted cash	69	56
Special use funds [Abstract]
Equity securities	2,062	2,538
U.S. Government and municipal bonds	641	770
Corporate debt securities	6	7
Asset-backed securities	0	0
Other debt securities	1	2
Other Investments [Abstract]
Equity securities	30	70
Debt securities	117	111
Level 2 | Fair Value, Recurring [Member]
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	0	0
Special use funds [Abstract]
Equity securities	2,375	2,973
U.S. Government and municipal bonds	63	75
Corporate debt securities	716	955
Asset-backed securities	615	663
Other debt securities	19	33
Other Investments [Abstract]
Equity securities	1	2
Debt securities	300	162
Level 3 | Fair Value, Recurring [Member]
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	0	0
Special use funds [Abstract]
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 [Abstract]
Equity securities	0	0
Debt securities	$ 118	$ 12
FPL [Member]
Other Investments [Abstract]
Restricted Cash and Cash Equivalents, Statement of Financial Position [Extensible Enumeration]	Other	Other
FPL [Member] | Fair Value, Recurring [Member]
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	$ 36	$ 58
Special use funds [Abstract]
Equity securities	2,905	3,552
U.S. Government and municipal bonds	534	668
Corporate debt securities	553	726
Asset-backed securities	473	515
Other debt securities	12	25
Other Investments [Abstract]
Equity securities	9	13
Debt securities	114
FPL [Member] | Level 1 | Fair Value, Recurring [Member]
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	36	58
Restricted cash	33	53
Special use funds [Abstract]
Equity securities	743	862
U.S. Government and municipal bonds	505	624
Corporate debt securities	6	6
Asset-backed securities	0	0
Other debt securities	1	2
Other Investments [Abstract]
Equity securities	9	13
Debt securities	0
FPL [Member] | Level 2 | Fair Value, Recurring [Member]
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	0	0
Special use funds [Abstract]
Equity securities	2,162	2,690
U.S. Government and municipal bonds	29	44
Corporate debt securities	547	720
Asset-backed securities	473	515
Other debt securities	11	23
Other Investments [Abstract]
Equity securities	0	0
Debt securities	114
FPL [Member] | Level 3 | Fair Value, Recurring [Member]
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	0	0
Special use funds [Abstract]
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 [Abstract]
Equity securities	0	$ 0
Debt securities	$ 0