Income Taxes - Reconciliation Between the Effective Income Tax Rates and the Applicable Statutory Rate (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Effective Income Tax Rate Reconciliation [Line Items]
Statutory federal income tax rate	21.00%	21.00%	21.00%	21.00%
Increases (reductions) resulting from:
State income taxes - net of federal income tax benefit(a)	1.90%	4.30%	1.30%	3.40%
Taxes attributable to noncontrolling interests	1.80%	2.00%	2.90%	1.90%
PTCs and ITCs - NEER	(7.40%)	(11.50%)	(8.70%)	(7.90%)
Amortization of deferred regulatory credit	(4.40%)	(5.60%)	(5.40%)	(7.00%)
Foreign operations(c)	0.00%	0.00%	(2.20%)	0.00%
Other - net	(2.60%)	(3.40%)	(5.90%)	(2.30%)
Effective income tax rate	10.30%	6.80%	3.00%	9.10%
FPL [Member]
Effective Income Tax Rate Reconciliation [Line Items]
Statutory federal income tax rate	21.00%	21.00%	21.00%	21.00%
Increases (reductions) resulting from:
State income taxes - net of federal income tax benefit(a)	3.70%	3.90%	4.00%	3.30%
Taxes attributable to noncontrolling interests	0.00%	0.00%	0.00%	0.00%
PTCs and ITCs - NEER	0.00%	0.00%	0.00%	0.00%
Amortization of deferred regulatory credit	(5.60%)	(5.20%)	(5.20%)	(8.00%)
Foreign operations(c)	0.00%	0.00%	0.00%	0.00%
Other - net	(0.90%)	(1.60%)	(1.30%)	(0.70%)
Effective income tax rate	18.20%	18.10%	18.50%	15.60%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amortization, Amount				$ 83
Amortization Of Excess Deferred Income Taxes				870
State [Member]
Increases (reductions) resulting from:
Deferred state tax credits	$ 48			$ 48

Amortization Of Excess Deferred Income Taxes

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Effective Income Tax Rate Reconciliation, Increases (Decreases), Percent [Abstract]

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[Line Items] for Effective Income Tax Rate Reconciliation [Table]

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Effective Income Tax Rate Reconciliation, Production And Investment Tax Credits

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Amount of deferred income tax expense (benefit) and income tax credits.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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