Income Taxes - Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Statutory federal income tax rate	21.00%	21.00%	21.00%
Increases (reductions) resulting from:
State income taxes – net of federal income tax benefit(a)	1.60%	2.80%	3.40%
Taxes attributable to noncontrolling interests	5.00%	4.80%	2.10%
PTCs and ITCs – NEER	(10.30%)	(11.80%)	(7.20%)
Amortization of deferred regulatory credit(b)	(4.40%)	(7.20%)	(6.20%)
Foreign operations(c)	0.20%	(2.40%)	0.00%
Other – net	(2.10%)	(5.40%)	(1.40%)
Effective income tax rate (in hundredths)	11.00%	1.80%	11.70%
State [Member]
Increases (reductions) resulting from:
Deferred Income Taxes and Tax Credits		$ 48
FPL [Member]
Operating Loss Carryforwards [Line Items]
Statutory federal income tax rate	21.00%	21.00%	21.00%
Increases (reductions) resulting from:
State income taxes – net of federal income tax benefit(a)	4.10%	4.20%	3.50%
Taxes attributable to noncontrolling interests	0.00%	0.00%	0.00%
PTCs and ITCs – NEER	0.00%	0.00%	0.00%
Amortization of deferred regulatory credit(b)	(3.50%)	(4.90%)	(8.00%)
Foreign operations(c)	0.00%	0.00%	0.00%
Other – net	(0.90%)	(1.30%)	(0.40%)
Effective income tax rate (in hundredths)	20.70%	19.00%	16.10%
Amortization of deferred regulatory credit		$ 83
Amortization Of Excess Deferred Income Taxes		$ 870