Debt (Schedule of Debt Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Less current maturities of long-term debt	$ 2,220	$ 3,515
Long-term debt, excluding current maturities	26,681	24,044
liabilities associated with assets held-for-sale [Member]
Debt Instrument [Line Items]
Total long-term debt	938
FPL [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs and discount	(114)	(121)
Total long-term debt	10,020	9,388
Less current maturities of long-term debt	64	60
Long-term debt, excluding current maturities	$ 9,956	$ 9,328
FPL [Member] | First mortgage bonds - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	4.77%	4.95%
Long-term debt, gross	$ 8,690	$ 8,490
FPL [Member] | Storm-recovery bonds - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	5.26%	5.24%
Long-term debt, gross	$ 273	$ 331
FPL [Member] | Pollution control, solid waste disposal and industrial development revenue bonds - variable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	0.04%	0.05%
Long-term debt, gross	$ 718	$ 633
FPL [Member] | Other long-term debt - variable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	1.11%
Long-term debt, gross	$ 400	$ 0
FPL [Member] | Other long-term debt - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	5.06%	4.96%
Long-term debt, gross	$ 53	$ 55
Capital Holdings [Member]
Debt Instrument [Line Items]
Fair value hedge adjustment	24	20
Unamortized debt issuance costs and discount	(94)	(112)
Total long-term debt	10,567	10,431
Less current maturities of long-term debt	667	1,787
Long-term debt, excluding current maturities	$ 9,900	$ 8,644
Capital Holdings [Member] | Other long-term debt - variable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	1.81%	2.44%
Long-term debt, gross	$ 1,513	$ 716
Capital Holdings [Member] | Other long-term debt - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	2.74%	2.70%
Long-term debt, gross	$ 810	$ 510
Capital Holdings [Member] | Debentures - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	3.15%	3.87%
Long-term debt, gross	$ 3,100	$ 3,125
Capital Holdings [Member] | Debentures, related to NEE's equity units - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	1.98%	1.54%
Long-term debt, gross	$ 1,200	$ 2,152
Capital Holdings [Member] | Junior subordinated debentures - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	5.84%	5.84%
Long-term debt, gross	$ 2,978	$ 2,978
Capital Holdings [Member] | Senior secured bonds - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	7.50%	7.50%
Long-term debt, gross	$ 497	$ 500
Capital Holdings [Member] | Japanese yen denominated senior notes - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	5.13%	5.13%
Long-term debt, gross	$ 83	$ 83
Capital Holdings [Member] | Japanese yen denominated term loans - variable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	1.83%	1.83%
Long-term debt, gross	$ 456	$ 459
NEER [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs and discount	(131)	(135)
Total long-term debt	8,314	7,740
Less current maturities of long-term debt	1,489	1,668
Long-term debt, excluding current maturities	$ 6,825	$ 6,072
NEER [Member] | Senior secured limited-recourse bonds and notes - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	5.88%	6.02%
Long-term debt, gross	$ 2,203	$ 2,273
NEER [Member] | Senior secured limited-recourse term loans - primarily variable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	2.51%	3.12%
Long-term debt, gross	$ 3,969	$ 4,242
NEER [Member] | Senior secured limited-recourse term loans - primarily variable [Member] | Great of Underlying Index or Floor, Plus a Margin [Member]
Debt Instrument [Line Items]
Long-term debt, gross		$ 983
NEER [Member] | Other long-term debt - primarily variable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	2.80%	3.71%
Long-term debt, gross	$ 2,118	$ 656
NEER [Member] | Canadian revolving credit facilities - variable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	1.56%	2.33%
Long-term debt, gross	$ 155	$ 704