Commitments and Contingencies (Long-term Purchase Commitment) (Details) $ in Millions				1 Months Ended	3 Months Ended		9 Months Ended
	May. 01, 2017 MMBTU / d	Oct. 01, 2015 USD ($)	Jul. 31, 2015 Bcf / d	Sep. 30, 2015 USD ($) MW	Sep. 30, 2015 USD ($) MW	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) MW	Sep. 30, 2014 USD ($)
Corporate and Other [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2015				$ 155	$ 155		$ 155
2016				1,005	1,005		1,005
2017				665	665		665
2018				385	385		385
2019				65	65		65
Thereafter				25	25		25
Commitment to invest				65	65		65
Joint Obligations Of NEECH and NEER included NEER Amounts due in the current year				85	85		85
Joint Obligations Of NEECH and NEER included NEER Amounts due in the second year				$ 615	615		615
FPL [Member]
Required capacity and/or minimum payments [Abstract]
Capacity payments					112	$ 123	349	$ 369
Energy payments					$ 99	$ 110	$ 221	$ 242
FPL [Member] | Take-or-Pay Contract Range 1 [Member]
Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract]
Minimum annual purchase commitments (in megawatts) | MW							375
FPL [Member] | Take-or-Pay Contract Range 2 [Member]
Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract]
Minimum annual purchase commitments (in megawatts) | MW							953
FPL [Member] | Coal Fired Generation Facility [Member]
Long-term Purchase Commitment [Line Items]
Coal Fired Generating Facility Capacity (in MW) | MW				250	250		250
Purchase price of coal-fired generation facility				$ 521	$ 521		$ 521
Amortization period of regulatory asset				10 years
Regulatory asset recovery through capacity clause				$ 709
Regulatory asset recovery through base rates until next test year				138
Regulatory assets, net of amortization				840	840		$ 840
Reduction to the reserve amount related to settlement that may be amortized under the 2012 rate agreement				30
Reserve amount that may be amortized under the 2012 rate agreement less reduction related to settlement				370
Reserve amount that may be amortized under the 2012 rate agreement				400
Earned Regulatory Roe Threshold Below Which Retailbase Rate Relief May Be Sought							9.50%
FPL [Member] | Natural Gas, Including Transportation And Storage, Contract Minimum Payments [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2015				325	325		$ 325
2016				955	955		955
2017				850	850		850
2018				865	865		865
2019				860	860		860
Thereafter				13,940	13,940		13,940
FPL [Member] | Coal Contract Minimum Payments [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2015				30	30		30
2016				60	60		60
2017				40	40		40
2018				0	0		0
2019				0	0		0
Thereafter				0	0		$ 0
FPL [Member] | Pay-for-Performance Contracts [Member]
Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract]
Minimum total purchase commitments (in megawatts) | MW							455
Required capacity and/or minimum payments [Abstract]
Remainder of 2015				40	40		$ 40
2016				115	115		115
2017				115	115		115
2018				115	115		115
2019				115	115		115
Thereafter				835	835		835
FPL [Member] | Take-or-Pay Contracts[Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2015				50	50		50
2016				70	70		70
2017				60	60		60
2018				30	30		30
2019				10	10		10
Thereafter				0	0		0
FPL [Member] | Scenario, Forecast [Member] | Sabal Trail and Florida Southeast Connection [Member]
Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract]
Time period under contracts	25 years
Long Term Purchase Commiment, Initial Quantity Per Day | MMBTU / d	400,000
Long Term Purchase Commitment, Increased Volume Required | MMBTU / d	600,000
FPL [Member] | Sabal Trail and Florida Southeast Connection [Member] | Natural Gas, Including Transportation And Storage, Contract Minimum Payments [Member]
Required capacity and/or minimum payments [Abstract]
2017				200	200		200
2018				295	295		295
2019				290	290		290
Thereafter				8,245	8,245		8,245
NextEra Energy Resources [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2015				930	930		930
2016				1,710	1,710		1,710
2017				155	155		155
2018				160	160		160
2019				90	90		90
Thereafter				620	620		620
NextEra Energy Resources [Member] | Contract Group 1 [Member]
Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract]
Commitment amount included in capital expenditures				3,000	3,000		3,000
Natural Gas Expenditures [Member] | Corporate and Other [Member]
Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract]
commitment to invest in pipeline				$ 2,200	$ 2,200		$ 2,200
NET Midstream [Member] | NEP [Member]
Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract]
Ownership percentage			100.00%
Pipeline existing capacity in bcf per day | Bcf / d			4,000,000,000
Volume currently contracted with ship or payments, in bcf per day | Bcf / d			3,000,000,000
Additional contracted volumes, in bcf per day | Bcf / d			900,000,000.0
NET Midstream [Member] | Subsidiary of NEP [Member] | Subsequent Event [Member]
Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract]
Aggregate purchase price		$ 2,000
Cash consideration		934
Assumption of existing debt in consideration		654
Additional capital expenditures		100
Aggregate purchase price after contingent considerations		2,100
Holdback Payable [Member] | NET Midstream [Member] | Subsidiary of NEP [Member] | Subsequent Event [Member]
Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract]
Contingent consideration liability		200
Indemnity Holdback [Member] | NET Midstream [Member] | Subsidiary of NEP [Member] | Subsequent Event [Member]
Long-term Commitment (Excluding Unconditional Purchase Obligation) [Abstract]
Contingent consideration liability		200
Contingent consideration, reduction in indemnity holdback		$ 10