Variable Interest Entities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) entities variable_interest_entity MW	Dec. 31, 2015 USD ($) entities	Dec. 31, 2014 USD ($)	Jul. 01, 2014	Dec. 31, 2007 USD ($)
Variable Interest Entity [Line Items]
Total number of consolidated variable interest entities (in entities)	33
Investment in equity method investees	$ 1,767	$ 1,063	$ 663
NEP OpCo [Member]
Variable Interest Entity [Line Items]
Total number of consolidated variable interest entities (in entities) | variable_interest_entity	1
Carrying amount of assets, consolidated variable interest entity	$ 7,200
Carrying amount of liabilities, consolidated variable interest entity	5,000
Other variable interest entities [Member]
Variable Interest Entity [Line Items]
Investments in special purpose entities	2,505	602
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
Carrying amount of assets, consolidated variable interest entity	216	230
Carrying amount of liabilities, consolidated variable interest entity	$ 214	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	$ 2,049	476
NEER [Member]
Variable Interest Entity [Line Items]
Total number of consolidated variable interest entities (in entities) | entities	32
Investment in equity method investees	$ 1,488	871
NEER [Member] | Gas and/or oil variable interest entities [Member]
Variable Interest Entity [Line Items]
Carrying amount of assets, consolidated variable interest entity	95	84
Carrying amount of liabilities, consolidated variable interest entity	$ 42	$ 47
Natural gas and or oil electric generating facility capacity (in megawatts) | MW	110
NEER [Member] | Photovoltaic Solar Facility [Member]
Variable Interest Entity [Line Items]
Solar Generating Facility Capability | MW	374
NEER [Member] | Special Purpose Entity that has Insufficient Equity at Risk [Member]
Variable Interest Entity [Line Items]
Total number of consolidated variable interest entities (in entities) | variable_interest_entity	1
Carrying amount of assets, consolidated variable interest entity	$ 502
Carrying amount of liabilities, consolidated variable interest entity	$ 511
NEER [Member] | Wind variable interest entities [Member]
Variable Interest Entity [Line Items]
Total number of consolidated variable interest entities (in entities) | entities	27	20
Carrying amount of assets, consolidated variable interest entity	$ 10,900	$ 7,600
Carrying amount of liabilities, consolidated variable interest entity	$ 6,900	5,000
Wind electric generating facility capability (in megawatts) | MW	6,847
NEER [Member] | Gas and or Oil Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Total number of consolidated variable interest entities (in entities) | entities	1
Indirect Subsidiary of NextEra Energy Resources [Member] | Photovoltaic Solar Facility [Member]
Variable Interest Entity [Line Items]
Total number of consolidated variable interest entities (in entities) | entities	2
Carrying amount of assets, consolidated variable interest entity	$ 571	657
Carrying amount of liabilities, consolidated variable interest entity	$ 487	$ 626
Ownership percentage (in hundredths)	50.00%
Solar Generating Facility Capability | MW	277
Subsidiaries of NEE [Member]
Variable Interest Entity [Line Items]
Equity Method Investments, Additional Commitments to Invest	$ 30
Equity Method Investments, Additional Variable Interest Entities Committed to Invest In | variable_interest_entity	2
NEP OpCo [Member]
Variable Interest Entity [Line Items]
Noncontrolling interest ownership percentage	65.20%			79.90%
Other Investments [Member]
Variable Interest Entity [Line Items]
Investment in equity method investees	$ 234