Variable Interest Entities (VIEs) (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2016 USD ($) variable_interest_entity MW	Dec. 31, 2007 USD ($)	Dec. 31, 2015 USD ($) variable_interest_entity
Variable Interest Entity [Line Items]
Total number of consolidated variable interest entities | variable_interest_entity	29
Investment in subsidiaries	$ 0		$ 0
NEP OpCo [Member]
Variable Interest Entity [Line Items]
Total number of consolidated variable interest entities | variable_interest_entity	1
Carrying amount of assets, consolidated variable interest entity	$ 7,400
Carrying amount of liabilities, consolidated variable interest entity	5,200
Other variable interest entities [Member]
Variable Interest Entity [Line Items]
Investments in special purpose entities	2,427		602
FPL [Member] | Bankruptcy remote special purpose subsidiary [Member]
Variable Interest Entity [Line Items]
Carrying amount of assets, consolidated variable interest entity	171		230
Carrying amount of liabilities, consolidated variable interest entity	$ 211		278
FPL [Member] | Qualifying facility 2 [Member]
Variable Interest Entity [Line Items]
Coal fired generating facility capacity (in megawatts) | MW	330
FPL [Member] | Other variable interest entities [Member]
Variable Interest Entity [Line Items]
Investments in special purpose entities	$ 1,975		476
NextEra Energy Resources [Member]
Variable Interest Entity [Line Items]
Total number of consolidated variable interest entities | variable_interest_entity	27
NextEra Energy Resources [Member] | Gas and/or oil variable interest entities [Member]
Variable Interest Entity [Line Items]
Total number of consolidated variable interest entities | variable_interest_entity	1
Carrying amount of assets, consolidated variable interest entity	$ 90		84
Carrying amount of liabilities, consolidated variable interest entity	$ 41		$ 47
Natural gas and or oil electric generating facility capacity (in megawatts) | MW	110
NextEra Energy Resources [Member] | Photovoltaic Solar Facility [Member]
Variable Interest Entity [Line Items]
Wind electric generating facility capability (in megawatts) | MW	178
Solar Generating Facility Capability | MW	196
NextEra Energy Resources [Member] | Wind variable interest entities [Member]
Variable Interest Entity [Line Items]
Total number of consolidated variable interest entities | variable_interest_entity	23		20
Carrying amount of assets, consolidated variable interest entity	$ 8,500		$ 7,600
Carrying amount of liabilities, consolidated variable interest entity	$ 4,400		5,000
Wind electric generating facility capability (in megawatts) | MW	5,522
NEECH [Member] | Special Purpose Entity that has Insufficient Equity at Risk [Member]
Variable Interest Entity [Line Items]
Carrying amount of assets, consolidated variable interest entity	$ 513
Carrying amount of liabilities, consolidated variable interest entity	$ 497
Indirect Subsidiary of NextEra Energy Resources [Member] | Photovoltaic Solar Facility [Member]
Variable Interest Entity [Line Items]
Total number of consolidated variable interest entities | variable_interest_entity	2
Carrying amount of assets, consolidated variable interest entity	$ 758		657
Carrying amount of liabilities, consolidated variable interest entity	$ 681		$ 626
Ownership percentage	50.00%
Solar Generating Facility Capability | MW	277
Subsidiaries of NEE [Member]
Variable Interest Entity [Line Items]
Additional commitments to invest	$ 30
Additional VIEs committed to invest in | variable_interest_entity	2
Other Investments [Member]
Variable Interest Entity [Line Items]
Investment in subsidiaries	$ 259
Senior Secured Debt [Member] | FPL [Member] | Bankruptcy remote special purpose subsidiary [Member]
Variable Interest Entity [Line Items]
Storm-recovery bonds aggregate principal amount issued		$ 652
Proceeds from issuance of storm-recovery bonds		$ 644
NEP OpCo [Member]
Variable Interest Entity [Line Items]
Ownership percentage	65.20%