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Fair Value Measurements (Reconciliation of Changes in the Fair Value) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair value based on significant unobservable inputs, beginning balance	$ 625	$ 715
Realized and unrealized gains (losses): [Abstract]
Included in Earnings			$ 37	$ 144
Included in other comprehensive income			7	(10)
Included in regulatory assets and liabilities			2	0
Purchases			61	23
Settlements			(55)	(72)
Issuances			(28)	(88)
Impact of adoption of new revenue standard			(30)	0
Transfers in			1	6
Transfers out			0	6
Fair value based on significant unobservable inputs, ending balance	650	724	650	724
The amount of gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to derivatives still held at the reporting date			57	135
Realized and unrealized gains (losses) reflected in operating revenues	44	140	71	356
Unrealized gains (losses) reflected in operating revenues related to derivatives still held at the reporting date	64	131	57	280
FPL [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair value based on significant unobservable inputs, beginning balance	(2)	(4)
Realized and unrealized gains (losses): [Abstract]
Included in Earnings			0	0
Included in other comprehensive income			0	0
Included in regulatory assets and liabilities			2	0
Purchases			0	0
Settlements			(1)	2
Issuances			0	0
Impact of adoption of new revenue standard			0	0
Transfers in			1	0
Transfers out			0	0
Fair value based on significant unobservable inputs, ending balance	0	$ (2)	0	(2)
The amount of gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to derivatives still held at the reporting date			0	0
Derivative Financial Instruments, Net [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair value of net derivatives based on significant unobservable inputs at December 31 of prior period					$ 566	$ 578
Realized and unrealized gains (losses): [Abstract]
Included in earnings			52	360
Included in other comprehensive income			4	(11)
Included in regulatory assets and liabilities			0	(2)
Purchases			103	45
Settlements			(7)	(157)
Issuances			(61)	(104)
Transfers in			1	14
Transfers out			22	1
Gains (losses) included in earnings attributable to the change in unrealized gains (losses) relating to derivatives held at the reporting date			38	284
Derivative Financial Instruments, Net [Member] | FPL [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair value of net derivatives based on significant unobservable inputs at December 31 of prior period					$ 0	$ 1
Realized and unrealized gains (losses): [Abstract]
Included in earnings			0	0
Included in other comprehensive income			0	0
Included in regulatory assets and liabilities			0	(2)
Purchases			0	0
Settlements			(1)	(1)
Issuances			0	0
Transfers in			1	0
Transfers out			0	0
Gains (losses) included in earnings attributable to the change in unrealized gains (losses) relating to derivatives held at the reporting date			0	$ 0
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member] | NextEra Energy Resources [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 146		$ 146

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Amount of gain (loss) recognized in other comprehensive income, arising from assets, liabilities and financial instruments classified in shareholders' equity measured at fair value on a recurring basis using unobservable inputs (level 3).

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