Debt (Details)	9 Months Ended
Sep. 30, 2017 USD ($)
FPL [Member] \| Other Long Term Debt, Variable [Member]
Debt Instrument [Line Items]
Principal Amount	$ 200,000,000
Interest Rate Terms	Variable
NextEra Energy Capital Holdings, Inc. [Member] \| Debentures - Fixed [Member]
Debt Instrument [Line Items]
Principal Amount	$ 1,250,000,000
Interest Rate (as a percent)	3.55%
NextEra Energy Capital Holdings, Inc. [Member] \| Japanese Yen Denominated Term Loan [Member]
Debt Instrument [Line Items]
Principal Amount	$ 535,000,000
Interest Rate Terms	Variable
NextEra Energy Capital Holdings, Inc. [Member] \| Junior Subordinated Debentures - Fixed [Member]
Debt Instrument [Line Items]
Principal Amount	$ 755,000,000
Interest Rate (as a percent)	5.11%
NEER [Member] \| Other Long Term Debt, Variable [Member]
Debt Instrument [Line Items]
Principal Amount	$ 480,000,000
Interest Rate Terms	Variable
NEER [Member] \| Senior Secured Limited Recourse Term Loans, Variable [Member]
Debt Instrument [Line Items]
Principal Amount	$ 308,000,000
Interest Rate Terms	Variable
NEER [Member] \| Senior Unsecured Convertible Notes [Member]
Debt Instrument [Line Items]
Principal Amount	$ 300,000,000
Interest Rate (as a percent)	1.50%
Convertible debt, conversion rate (in units per $1,000 of par value)	18.9170
NEER [Member] \| Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Principal Amount	$ 1,100,000,000
NEER [Member] \| Senior Secured Limited-Recourse Notes [Member]
Debt Instrument [Line Items]
Principal Amount	$ 200,000,000
Interest Rate (as a percent)	3.50%
Minimum [Member] \| NEER [Member] \| Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Interest Rate (as a percent)	4.25%
Maximum [Member] \| NEER [Member] \| Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Interest Rate (as a percent)	4.50%

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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-Section 45
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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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