Variable Interest Entities (VIEs) (Details) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($) variable_interest_entity entity MW	Dec. 31, 2020 USD ($) variable_interest_entity entity mi MW	Dec. 31, 2019 USD ($) entity variable_interest_entity MW	Dec. 31, 2018 USD ($)
Variable Interest Entity [Line Items]
Carrying amount of assets, consolidated variable interest entity	$ 127,684	$ 127,684	$ 117,691	$ 103,702
Carrying amount of liabilities, consolidated variable interest entity	82,755	82,755	75,844
Investment in equity method investees	5,728	5,728	7,453	$ 6,748
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Carrying amount of assets, consolidated variable interest entity	423	423	173
Carrying amount of liabilities, consolidated variable interest entity	68	$ 68	29
Variable Interest Entity, Consolidated, Income Allocation, Percentage		50.00%
Electricity Transmission Line | mi		280
Other variable interest entities [Member]
Variable Interest Entity [Line Items]
Investments in special purpose entities	3,704	$ 3,704	3,247
FPL[Member]
Variable Interest Entity [Line Items]
Carrying amount of assets, consolidated variable interest entity	61,610	61,610	57,188
Carrying amount of liabilities, consolidated variable interest entity	37,870	37,870	35,790
FPL[Member] | Other variable interest entities [Member]
Variable Interest Entity [Line Items]
Investments in special purpose entities	$ 3,124	$ 3,124	$ 2,717
NEER [Member]
Variable Interest Entity [Line Items]
Total Number Of Consolidated Variable Interest Entities | variable_interest_entity	40	40
Wind electric generating facility capability (in megawatts) | MW			220
Investment in equity method investees	$ 5,239	$ 5,239	$ 6,876
NEER [Member] | Variable Interest Entities Gas And Oil Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Carrying amount of assets, consolidated variable interest entity	188	188	216
Carrying amount of liabilities, consolidated variable interest entity	$ 22	$ 22	25
Total Number Of Consolidated Variable Interest Entities | variable_interest_entity	2	2
Natural gas and or oil electric generating facility capacity (in megawatts) | MW		1,450
NEER [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Wind electric generating facility capability (in megawatts) | MW		10,913
Solar generating facility capability | MW		1,377
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	$ 16,200	$ 16,200	11,300
Carrying amount of liabilities, consolidated variable interest entity	$ 1,700	$ 1,700	$ 800
Total Number Of Consolidated Variable Interest Entities	33	33	26
Wind electric generating facility capability (in megawatts) | MW		10,513
Solar generating facility capability | MW		778
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
Indirect Subsidiary of NextEra Energy Resources [Member] | Photovoltaic Solar Facility [Member]
Variable Interest Entity [Line Items]
Carrying amount of assets, consolidated variable interest entity	$ 751	$ 751	$ 776
Carrying amount of liabilities, consolidated variable interest entity	$ 607	$ 607	$ 598
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	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
NextEra Energy Resources Consolidated VIE [Member] | Photovoltaic Solar Facility [Member]
Variable Interest Entity [Line Items]
Carrying amount of assets, consolidated variable interest entity	$ 1,600	$ 1,600
Carrying amount of liabilities, consolidated variable interest entity	$ 400	400
Ownership percentage (in hundredths)	1000.00%
Wind electric generating facility capability (in megawatts) | MW	400
Solar generating facility capability | MW	599
Other Investments [Member] | Subsidiaries of NEE [Member]
Variable Interest Entity [Line Items]
Investment in equity method investees	$ 3,932	$ 3,932	$ 4,254