Variable Interest Entities (VIEs) (Details) $ in Millions	1 Months Ended	12 Months Ended
	Sep. 30, 2019 variable_interest_entity MW	Dec. 31, 2019 USD ($) variable_interest_entity entity MW	Dec. 31, 2018 USD ($) variable_interest_entity entity	Dec. 31, 2007 USD ($)	Dec. 31, 2017 USD ($)
Variable Interest Entity [Line Items]
Total Number Of Consolidated Variable Interest Entities | variable_interest_entity		33
Investment in equity method investees		$ 7,453	$ 6,748		$ 2,321
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Carrying amount of assets, consolidated variable interest entity		173
Carrying amount of liabilities, consolidated variable interest entity		$ 29
Variable Interest Entity, Consolidated, Income Allocation, Percentage		50.00%
Variable Interest Entities Gas And Oil Primary Beneficiary 2 [Member] [Domain]
Variable Interest Entity [Line Items]
Number of variable interest entities | entity			2
Other variable interest entities [Member]
Variable Interest Entity [Line Items]
Investments in special purpose entities		$ 3,247	$ 2,668
FPL[Member] | Bankruptcy remote special purpose subsidiary [Member]
Variable Interest Entity [Line Items]
Storm-recovery bonds aggregate principal amount issued				$ 652
Carrying amount of assets, consolidated variable interest entity			77
Carrying amount of liabilities, consolidated variable interest entity			76
FPL[Member] | Other variable interest entities [Member]
Variable Interest Entity [Line Items]
Investments in special purpose entities		$ 2,717	2,203
NEER [Member]
Variable Interest Entity [Line Items]
Total Number Of Consolidated Variable Interest Entities | variable_interest_entity		32
Wind electric generating facility capability (in megawatts) | MW	220
Investment in equity method investees		$ 6,876	6,151
NEER [Member] | Variable Interest Entities Gas And Oil Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Carrying amount of assets, consolidated variable interest entity		216	257
Carrying amount of liabilities, consolidated variable interest entity		$ 25	$ 21
Total Number Of Consolidated Variable Interest Entities		2	2
Natural gas and or oil electric generating facility capacity (in megawatts) | MW		1,450
NEER [Member] | Variable Interest Entities Gas And Oil Primary Beneficiary 2 [Member] [Domain]
Variable Interest Entity [Line Items]
Number of variable interest entities | entity			3
NEER [Member] | Variable Interest Entities Wind and Solar Primary Beneficiary [Member] [Member]
Variable Interest Entity [Line Items]
Carrying amount of assets, consolidated variable interest entity		$ 11,300	$ 10,200
Carrying amount of liabilities, consolidated variable interest entity		$ 800	$ 1,400
Total Number Of Consolidated Variable Interest Entities	26		25
Wind electric generating facility capability (in megawatts) | MW		7,081
Solar generating facility capability | MW		473
Indirect Subsidiary of NextEra Energy Resources [Member] | Photovoltaic Solar Facility [Member]
Variable Interest Entity [Line Items]
Carrying amount of assets, consolidated variable interest entity		$ 776	$ 529
Carrying amount of liabilities, consolidated variable interest entity		$ 598	$ 557
Total Number Of Consolidated Variable Interest Entities | variable_interest_entity		3	3
Ownership percentage (in hundredths)		50.00%
Number of variable interest entities | entity		5
Solar generating facility capability | MW		409
Subsidiaries of NEE [Member]
Variable Interest Entity [Line Items]
Equity method investments, additional variable interest entities committed to invest in | variable_interest_entity			5
Other Investments [Member] | Subsidiaries of NEE [Member]
Variable Interest Entity [Line Items]
Investment in equity method investees		$ 4,254	$ 4,680
Secured Debt [Member] | FPL[Member] | Bankruptcy remote special purpose subsidiary [Member]
Variable Interest Entity [Line Items]
Proceeds from Issuance of Senior Long-term Debt				$ 644