Commitments and Contingencies (Long-term Purchase Commitment) (Details) $ in Millions		1 Months Ended	3 Months Ended		9 Months Ended
	May 01, 2017 MMBTU / d	Jan. 31, 2017 USD ($) MW	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) MW	Sep. 30, 2015 USD ($)	Apr. 01, 2016	Dec. 31, 2015 USD ($)	Oct. 01, 2015 USD ($)
Long-term Purchase Commitment [Line Items]
Revaluation of contingent consideration			$ 101	$ 0	$ 118	$ 0
Corporate and Other [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2016			35		35
2017			25		25
2018			5		5
2019			0		0
2020			5		5
Thereafter			0		0
Commitment to invest			30		30
Joint Obligations Of NEECH and NEER included NEER Amounts due in the current year			215		215
Joint Obligations Of NEECH and NEER included NEER Amounts due in the second year			190		190
Joint Obligations Of NEECH and NEER included NEER Amounts due in the third year			30		30
FPL [Member]
Required capacity and/or minimum payments [Abstract]
Capacity payments			41	112	134	349
Energy payments			57	$ 99	103	$ 221
FPL [Member] | Capacity Charges [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2016			45		45
2017			165		165
2018			155		155
2019			135		135
2020			110		110
Thereafter			690		$ 690
FPL [Member] | Take-or-Pay Contract Range 1 [Member]
Long-term Purchase Commitment [Line Items]
Minimum annual purchase commitments (in megawatts) | MW					375
FPL [Member] | Natural Gas, Including Transportation And Storage, Contract Minimum Payments [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2016			320		$ 320
2017			1,065		1,065
2018			870		870
2019			860		860
2020			910		910
Thereafter			12,970		12,970
FPL [Member] | Coal Contract Minimum Payments [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2016			25		25
2017			120		120
2018			5		5
2019			5		5
2020			0		0
Thereafter			0		$ 0
FPL [Member] | Pay-for-Performance Contracts [Member]
Long-term Purchase Commitment [Line Items]
Minimum total purchase commitments (in megawatts) | MW					444
FPL [Member] | Scenario, Forecast [Member] | Sabal Trail and Florida Southeast Connection [Member]
Long-term Purchase Commitment [Line Items]
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
2018			295		295
2019			290		290
2020			360		360
Thereafter			7,885		7,885
NextEra Energy Resources [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2016			1,235		1,235
2017			1,345		1,345
2018			985		985
2019			125		125
2020			95		95
Thereafter			370		370
NextEra Energy Resources [Member] | Contract Group 1 [Member]
Long-term Purchase Commitment [Line Items]
Commitment amount included in capital expenditures			3,800		3,800
NextEra Energy Resources [Member] | Sabal Trail Transmission, LLC [Member]
Long-term Purchase Commitment [Line Items]
Equity Method Investment, Percentage of Interests Acquired							9.50%
Equity Method Investment, Ownership Percentage							42.50%
Holdback Payable [Member] | NET Holdings Management, LLC [Member] | Subsidiary of NextEra Energy Partners [Member]
Long-term Purchase Commitment [Line Items]
Contingent consideration liability									$ 200
Indemnity Holdback [Member] | NET Holdings Management, LLC [Member] | Subsidiary of NextEra Energy Partners [Member]
Long-term Purchase Commitment [Line Items]
Contingent consideration liability									$ 200
Contingent Holdback [Member]
Long-term Purchase Commitment [Line Items]
Revaluation of contingent consideration			101		118
Other Current Liabilities [Member] | Contingent Holdback [Member]
Long-term Purchase Commitment [Line Items]
Contingent consideration liability			70		70
Other Current Liabilities [Member] | Indemnification Obligations [Member]
Long-term Purchase Commitment [Line Items]
Contingent consideration liability			197		197
Other Liabilities [Member] | Contingent Holdback [Member]
Long-term Purchase Commitment [Line Items]
Contingent consideration liability								$ 186
Other Liabilities [Member] | Indemnification Obligations [Member]
Long-term Purchase Commitment [Line Items]
Contingent consideration liability								$ 188
Indiantown, Florida [Member] | FPL [Member] | Coal Fired Generation Facility [Member]
Long-term Purchase Commitment [Line Items]
Remaining payments under long term purchased power agreement, total			810		810
Remainder of 2016 payments under long term purchased power agreement			$ 23		$ 23
Indiantown, Florida [Member] | FPL [Member] | Scenario, Forecast [Member] | Coal Fired Generation Facility [Member]
Long-term Purchase Commitment [Line Items]
Coal fired generating facility capacity (in megawatts) | MW		330
Purchase price		$ 451
Existing debt assumed		218
Other Regulatory Assets (Liabilities) [Member] | Indiantown, Florida [Member] | FPL [Member] | Scenario, Forecast [Member] | Coal Fired Generation Facility [Member]
Long-term Purchase Commitment [Line Items]
Regulatory asset		$ 451
Regulatory asset amortization period (in years)		9 years