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Derivative Instruments and Hedging Activities (Reconciliation of Changes in the Fair Value) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
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	$ 1,207	$ 647	$ 566
Realized and unrealized gains (losses):
Included in earnings	547	923	35
Included in other comprehensive income (loss)	1	5	7
Included in regulatory assets and liabilities	2	1	(18)
Purchases	191	141	152
Sales	114	0	0
Settlements	(562)	(356)	28
Issuances	(123)	(87)	(115)
Impact of adoption of new revenue standard	0	0	(30)
Transfers in	18	(5)	0
Transfers out	(21)	(62)	22
Fair value of net derivatives based on significant unobservable inputs at December 31	1,374	1,207	647
Gains (losses) included in earnings attributable to the change in unrealized gains (losses) relating to derivatives held at the reporting date	317	611	100
Realized and unrealized gains (losses) reflected in operating revenues	569	956	48
Unrealized gains (losses) reflected in operating revenues, for derivatives still held at the reporting date	317	638	112
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)	(36)	0
Realized and unrealized gains (losses):
Included in earnings	0	0	(1)
Included in other comprehensive income (loss)	0	0	0
Included in regulatory assets and liabilities	2	1	(18)
Purchases	0	0	(16)
Sales	0	0	0
Settlements	6	25	(2)
Issuances	0	0	0
Impact of adoption of new revenue standard	0	0	0
Transfers in	(1)	0	0
Transfers out	0	2	1
Fair value of net derivatives based on significant unobservable inputs at December 31	(1)	(8)	(36)
Gains (losses) included in earnings attributable to the change in unrealized gains (losses) relating to derivatives held at the reporting date	0	$ 0	$ (1)
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Liabilities, Fair Value Disclosure	$ 305

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Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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Fair value of financial and nonfinancial obligations.

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