Non-Derivative Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	$ 176	$ 742
Special use funds [Abstract]
Equity securities	5,511	4,726
U.S. Government and municipal bonds	845	717
Corporate debt securities	962	871
Mortgage-backed securities	431	422
Other debt securities	267	124
Other Investments [Abstract]
Equity securities	72	62
Debt securities	285	218
Level 1
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	176	742
Special use funds [Abstract]
Equity securities	2,538	2,237
U.S. Government and municipal bonds	770	590
Corporate debt securities	7	1
Mortgage-backed securities	0	0
Other debt securities	2	0
Other Investments [Abstract]
Equity securities	70	62
Debt securities	111	91
Level 1 \| Current other assets
Assets [Abstract]
Restricted cash	56	111
Level 1 \| Other Noncurrent Assets [Member]
Assets [Abstract]
Restricted cash		42
Level 2
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	0	0
Special use funds [Abstract]
Equity securities	2,973	2,489
U.S. Government and municipal bonds	75	127
Corporate debt securities	955	870
Mortgage-backed securities	431	422
Other debt securities	265	124
Other Investments [Abstract]
Equity securities	2	0
Debt securities	162	127
Level 3
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
Mortgage-backed securities	0	0
Other debt securities	0	0
Other Investments [Abstract]
Equity securities	0	0
Debt securities	12	0
FPL [Member]
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	58	137
Special use funds [Abstract]
Equity securities	3,552	3,012
U.S. Government and municipal bonds	668	536
Corporate debt securities	726	627
Mortgage-backed securities	313	335
Other debt securities	227	119
Other Investments [Abstract]
Equity securities	13	12
FPL [Member] \| Level 1
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	58	137
Special use funds [Abstract]
Equity securities	862	752
U.S. Government and municipal bonds	624	449
Corporate debt securities	6	0
Mortgage-backed securities	0	0
Other debt securities	2	0
Other Investments [Abstract]
Equity securities	13	12
FPL [Member] \| Level 1 \| Current other assets
Assets [Abstract]
Restricted cash	53	91
FPL [Member] \| Level 1 \| Other Noncurrent Assets [Member]
Assets [Abstract]
Restricted cash		42
FPL [Member] \| Level 2
Assets [Abstract]
Cash equivalents and restricted cash - equity securities	0	0
Special use funds [Abstract]
Equity securities	2,690	2,260
U.S. Government and municipal bonds	44	87
Corporate debt securities	720	627
Mortgage-backed securities	313	335
Other debt securities	225	119
Other Investments [Abstract]
Equity securities	0	0
FPL [Member] \| Level 3
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
Mortgage-backed securities	0	0
Other debt securities	0	0
Other Investments [Abstract]
Equity securities	$ 0	$ 0

-- None. No documentation exists for this element. --

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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