Income Taxes - Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Statutory federal income tax rate	21.00%	21.00%	35.00%
Increases (reductions) resulting from:
State income taxes - net of federal income tax benefit	3.40%	4.20%	2.90%
Taxes attributable to noncontrolling interests	2.10%	2.50%	0.00%
Tax reform rate change	0.00%	0.00%	(41.30%)
PTCs and ITCs - NEER	(7.20%)	(3.00%)	(8.40%)
Amortization of deferred regulatory credit(a)	(6.20%)	(1.80%)	0.00%
Convertible ITCs - NEER	0.00%	0.00%	0.60%
Other - net	(1.40%)	(1.50%)	(3.00%)
Effective income tax rate (in hundredths)	11.70%	21.40%	(14.20%)
FPL[Member]
Operating Loss Carryforwards [Line Items]
Statutory federal income tax rate	21.00%	21.00%	35.00%
Increases (reductions) resulting from:
State income taxes - net of federal income tax benefit	3.50%	4.50%	3.50%
Taxes attributable to noncontrolling interests	0.00%	0.00%	0.00%
Tax reform rate change	0.00%	0.00%	(0.50%)
PTCs and ITCs - NEER	0.00%	0.00%	0.00%
Amortization of deferred regulatory credit(a)	(8.10%)	(5.00%)	(0.10%)
Convertible ITCs - NEER	0.00%	0.00%	0.00%
Other - net	(0.50%)	(0.60%)	(0.90%)
Effective income tax rate (in hundredths)	15.90%	19.90%	37.00%
Amortization of deferred regulatory credit	$ 83
Amortization Of Excess Deferred Income Taxes	$ 870