Derivative Instruments and Hedging Activities (Reconciliation of Changes in the Fair Value) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Realized and unrealized gains (losses):
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net Cash Provided by (Used in) Operating Activities	Net Cash Provided by (Used in) Operating Activities	Net Cash Provided by (Used in) Operating Activities
Derivative Financial Instruments, Net [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of net derivatives based on significant unobservable inputs at December 31 of prior year	$ 170	$ 1,374	$ 1,207
Realized and unrealized gains (losses):
Included in earnings	(2,343)	(1,488)	547
Included in other comprehensive income (loss)	0	0	1
Included in regulatory assets and liabilities	158	8	2
Purchases	542	243	191
Sales	0	0	114
Settlements	992	259	(562)
Issuances	(362)	(196)	(123)
Transfers in	(4)	2	18
Transfers out	(7)	(32)	(21)
Fair value of net derivatives based on significant unobservable inputs at December 31	(854)	170	1,374
Gains (losses) included in earnings attributable to the change in unrealized gains (losses) relating to derivatives held at the reporting date	(1,162)	(924)	317
Realized and unrealized gains (losses) reflected in operating revenues	(2,343)	(1,488)	569
Unrealized gains (losses) reflected in operating revenues, for derivatives still held at the reporting date	(1,162)	(924)	317
FPL [Member] | Derivative Financial Instruments, Net [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of net derivatives based on significant unobservable inputs at December 31 of prior year	8	(1)	(8)
Realized and unrealized gains (losses):
Included in earnings	0	0	0
Included in other comprehensive income (loss)	0	0	0
Included in regulatory assets and liabilities	158	8	2
Purchases	0	0	0
Sales	0	0	0
Settlements	(157)	1	6
Issuances	0	0	0
Transfers in	0	0	(1)
Transfers out	0	0	0
Fair value of net derivatives based on significant unobservable inputs at December 31	9	8	(1)
Gains (losses) included in earnings attributable to the change in unrealized gains (losses) relating to derivatives held at the reporting date	0	$ 0	$ 0
Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Liabilities, Fair Value Disclosure	$ 2,948