Debt - Narrative (Details)	1 Months Ended	3 Months Ended
	Apr. 23, 2019 USD ($) instrument	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	[1]
Debt Instrument [Line Items]
Issuances of long-term debt		$ 2,768,000,000	$ 1,804,000,000
Subsequent Event [Member] | NextEra Energy Capital Holdings, Inc. [Member]
Debt Instrument [Line Items]
Repayments of short-term term loan agreements	$ 4,500,000,000
Subsequent Event [Member] | NextEra Energy Capital Holdings, Inc. [Member] | Debentures [Member] | Debentures With Interest Rates Ranging From 2.90% To 3.50% And Maturing 2022 Through 2029 [Member]
Debt Instrument [Line Items]
Principal amount	2,700,000,000
Subsequent Event [Member] | NextEra Energy Capital Holdings, Inc. [Member] | Debentures [Member] | Junior Subordinated Debentures 5.65% Due 2079 [Member]
Debt Instrument [Line Items]
Principal amount	$ 500,000,000
Interest rate (as a percent)	5.65%
Subsequent Event [Member] | NextEra Energy Capital Holdings, Inc. [Member] | Term Loan Agreements [Member]
Debt Instrument [Line Items]
Issuances of long-term debt	$ 500,000,000
Number of instruments | instrument	2
Subsequent Event [Member] | NextEra Energy Capital Holdings, Inc. [Member] | Term Loan Agreements [Member] | Variable Rate Term Loan Agreement Due 2021 [Member]
Debt Instrument [Line Items]
Principal amount	$ 250,000,000
Subsequent Event [Member] | NextEra Energy Capital Holdings, Inc. [Member] | Term Loan Agreements [Member] | Variable Rate Term Loan Agreement Due 2022 [Member]
Debt Instrument [Line Items]
Principal amount	$ 250,000,000
Subsequent Event [Member] | NextEra Energy Capital Holdings, Inc. [Member] | Minimum [Member] | Debentures With Interest Rates Ranging From 2.90% To 3.50% And Maturing 2022 Through 2029 [Member]
Debt Instrument [Line Items]
Interest rate (as a percent)	2.90%
Subsequent Event [Member] | NextEra Energy Capital Holdings, Inc. [Member] | Maximum [Member] | Debentures With Interest Rates Ranging From 2.90% To 3.50% And Maturing 2022 Through 2029 [Member]
Debt Instrument [Line Items]
Interest rate (as a percent)	3.50%

[1] Amounts have been retrospectively adjusted for an accounting standards update related to leases.