Variable Interest Entities (VIEs) (Details) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 28, 2018 USD ($)	Mar. 31, 2019 USD ($) variable_interest_entity MW	Dec. 31, 2007 USD ($)	Mar. 31, 2019 mi	Mar. 31, 2019 variable_interest_entity	Mar. 31, 2019 entity	Dec. 31, 2018 USD ($) entity
Variable Interest Entity [Line Items]
Total number of consolidated variable interest entities | variable_interest_entity					31
Net cash proceeds	$ 71
Gain on sale	50
Gain on sale, after tax	$ 37
Investment in equity method investees		$ 6,735					$ 6,748
Other variable interest entities [Member]
Variable Interest Entity [Line Items]
Investments in special purpose entities		2,885					2,668
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Carrying amount of assets, consolidated variable interest entity		68
Carrying amount of liabilities, consolidated variable interest entity		$ 7
Electricity transmission line (mi) | mi				275
Percentage of profits and losses		50.00%
FPL [Member] | Bankruptcy remote special purpose subsidiary [Member]
Variable Interest Entity [Line Items]
Senior Secured Debt Aggregate Principal Amount Issued			$ 652
Carrying amount of assets, consolidated variable interest entity		$ 35					77
Carrying amount of liabilities, consolidated variable interest entity		36					76
FPL [Member] | Other variable interest entities [Member]
Variable Interest Entity [Line Items]
Investments in special purpose entities		2,396					$ 2,203
NextEra Energy Resources [Member]
Variable Interest Entity [Line Items]
Total number of consolidated variable interest entities | entity						29
NextEra Energy Resources [Member] | Variable Interest Entities Gas And Oil Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Total number of consolidated variable interest entities					2	2	3
Carrying amount of assets, consolidated variable interest entity		218					$ 257
Carrying amount of liabilities, consolidated variable interest entity		$ 18					$ 21
Natural gas and or oil electric generating facility capacity (in megawatts) | MW		1,450
NextEra Energy Resources [Member] | Variable Interest Entities Gas And Oil Primary Beneficiary 2 [Member] [Domain]
Variable Interest Entity [Line Items]
Number of entities with ownership interest contributed | entity						2	2
NextEra Energy Resources [Member] | Variable Interest Entities Wind and Solar Primary Beneficiary [Member] [Member]
Variable Interest Entity [Line Items]
Total number of consolidated variable interest entities | variable_interest_entity					25
Carrying amount of assets, consolidated variable interest entity		$ 10,200					$ 10,200
Carrying amount of liabilities, consolidated variable interest entity		$ 1,400					1,400
Solar generating facility capability (in MW) | MW		473
Wind electric generating facility capability (in megawatts) | MW		7,081
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		$ 492					529
Carrying amount of liabilities, consolidated variable interest entity		$ 542					557
Ownership percentage		50.00%
Number of entities with ownership interest contributed | entity						3
Solar generating facility capability (in MW) | MW		277
Subsidiaries of NEE [Member]
Variable Interest Entity [Line Items]
Additional commitments to invest		$ 55
Additional VIEs committed to invest in | variable_interest_entity		3
Other Investments [Member] | Subsidiaries of NEE [Member]
Variable Interest Entity [Line Items]
Investment in equity method investees		$ 4,504					$ 4,680
Senior Secured Debt [Member] | FPL [Member] | Bankruptcy remote special purpose subsidiary [Member]
Variable Interest Entity [Line Items]
Proceeds from issuance of storm-recovery bonds			$ 644