Debt (Narrative) (Details) - USD ($)		1 Months Ended			2 Months Ended	3 Months Ended
	Jun. 01, 2015	Sep. 30, 2015	Nov. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2015	Dec. 31, 2015	Aug. 31, 2015	May. 31, 2015	Dec. 31, 2014	Aug. 31, 2013
Debt Instrument [Line Items]
Weighted-average interest rate of commercial paper and short-tem borrowings (in hundredths)							2.10%			0.40%
Available lines of credit							$ 7,900,000,000
Issuances of common stock, net of issuance cost (in shares)			4,500,000
FPL [Member]
Debt Instrument [Line Items]
Weighted-average interest rate of commercial paper and short-tem borrowings (in hundredths)							0.83%			0.40%
Available lines of credit							$ 3,000,000,000
Letters of Credit Outstanding, Amount							6,000,000
Capital Holdings [Member]
Debt Instrument [Line Items]
Available lines of credit							4,900,000,000
Letters of Credit Outstanding, Amount							410,000,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity							4,000,000,000
Letter of Credit [Member] | FPL [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity							1,100,000,000
Letter of Credit [Member] | Capital Holdings [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity							$ 2,900,000,000
NEE Equity Units 2010 [Member]
Debt Instrument [Line Items]
Debentures remarketed											$ 402,400,000
Debt Instrument, Face Amount											$ 402,500,000
Rate of interest on debentures after remarketing											1.339%
Issuances of common stock, net of issuance cost (in shares)					5,946,530
Issuances of common stock					$ 402,500,000
NEE Equity Units 2013 [Member]
Sale of equity units [Abstract]
Amount of equity units sold				$ 500,000,000	$ 500,000,000
Stated amount of each equity unit (in dollars per share)				$ 50	$ 50
Undivided beneficial ownership interest per debenture (in hundredths)				5.00%	5.00%
Principal amount of each debenture				$ 1,000	$ 1,000
Price per share of stock purchase contract - low range (in dollars per share)				$ 82.70	$ 82.70
Price per share of stock purchase contract - high range (in dollars per share)				$ 99.24	$ 99.24
Number Of Shares Subject To Antidilution Adjustments If Purchased On Final Settlement Date At Less Than Or Equal To Low Range Threshold				0.6088	0.6088
Number of shares (subject to antidilution adjustments) if purchased on the final settlement date at equal to or greater than high range threshold (in shares)				0.5073	0.5073
Trading period (in days) over which the market value is determined by reference to the average closing prices of the common stock				20 days
Rate of total annual distributions on equity units (in hundredths)				5.799%	5.799%
Interest rate				1.45%	1.45%
Rate of payments on stock purchase contracts (in hundredths)				4.349%	4.349%
NEE Equity Units 2012 [Member]
Debt Instrument [Line Items]
Debentures remarketed								$ 650,000,000	$ 600,000,000
Rate of interest on debentures after remarketing								2.056%	1.586%
Issuances of common stock, net of issuance cost (in shares)	7,860,000					8,173,099
Issuances of common stock	$ 600,000,000					$ 650,000,000
NEE Equity Units 2015 [Member]
Sale of equity units [Abstract]
Amount of equity units sold		$ 700,000,000				$ 700,000,000
Stated amount of each equity unit (in dollars per share)		$ 50				$ 50
Undivided beneficial ownership interest per debenture (in hundredths)		5.00%				5.00%
Principal amount of each debenture		$ 1,000				$ 1,000
Price per share of stock purchase contract - low range (in dollars per share)		$ 95.35				$ 95.35
Price per share of stock purchase contract - high range (in dollars per share)		$ 114.42				$ 114.42
Number Of Shares Subject To Antidilution Adjustments If Purchased On Final Settlement Date At Less Than Or Equal To Low Range Threshold		0.5244				0.5244
Number of shares (subject to antidilution adjustments) if purchased on the final settlement date at equal to or greater than high range threshold (in shares)		0.4370				0.4370
Trading period (in days) over which the market value is determined by reference to the average closing prices of the common stock		20 days
Rate of total annual distributions on equity units (in hundredths)		6.371%				6.371%
Interest rate		2.36%				2.36%
Rate of payments on stock purchase contracts (in hundredths)		4.011%				4.011%