Derivative Instruments and Hedging Activities (Reconciliation of Changes in the Fair Value) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
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	$ 1,374	$ 1,207	$ 647
Realized and unrealized gains (losses):
Included in earnings	(1,488)	547	923
Included in other comprehensive income (loss)	0	1	5
Included in regulatory assets and liabilities	8	2	1
Purchases	243	191	141
Sales	0	114	0
Settlements	259	(562)	(356)
Issuances	(196)	(123)	(87)
Transfers in	2	18	(5)
Transfers out	(32)	(21)	(62)
Fair value of net derivatives based on significant unobservable inputs at December 31	170	1,374	1,207
Gains (losses) included in earnings attributable to the change in unrealized gains (losses) relating to derivatives held at the reporting date	(924)	317	611
Realized and unrealized gains (losses) reflected in operating revenues	(1,488)	569	956
Unrealized gains (losses) reflected in operating revenues, for derivatives still held at the reporting date	(924)	317	638
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	(1)	(8)	(36)
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	8	2	1
Purchases	0	0	0
Sales	0	0	0
Settlements	1	6	25
Issuances	0	0	0
Transfers in	0	(1)	0
Transfers out	0	0	2
Fair value of net derivatives based on significant unobservable inputs at December 31	8	(1)	(8)
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	$ 1,231