Debt (Schedule of Debt Instruments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Less current maturities of long-term debt	$ 3,515us-gaap_LongTermDebtCurrent	$ 3,766us-gaap_LongTermDebtCurrent
Long-term debt, excluding current maturities	24,367us-gaap_LongTermDebtNoncurrent	23,969us-gaap_LongTermDebtNoncurrent
FPL [Member]
Debt Instrument [Line Items]
Unamortized discount	(36)	(35)
Total long-term debt	9,473	8,829
Less current maturities of long-term debt	60	356
Long-term debt, excluding current maturities	9,413	8,473
FPL [Member] \| First mortgage bonds - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	4.95%	5.12%
Long-term debt, gross	8,490	7,490
FPL [Member] \| Storm-recovery bonds - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	5.24%	5.22%
Long-term debt, gross	331	386
FPL [Member] \| Pollution control, solid waste disposal and industrial development revenue bonds - variable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	0.05%	0.07%
Long-term debt, gross	633	633
FPL [Member] \| Other long-term debt - primarily variable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate		0.66%
Long-term debt, gross	0	300
FPL [Member] \| Other long-term debt - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	4.96%	4.96%
Long-term debt, gross	55	55
Capital Holdings [Member]
Debt Instrument [Line Items]
Unamortized discount	(1)	0
Total long-term debt	10,542	11,239
Less current maturities of long-term debt	1,787	1,469
Long-term debt, excluding current maturities	8,755	9,770
Capital Holdings [Member] \| Debentures - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	3.87%	4.43%
Long-term debt, gross	3,125	2,550
Capital Holdings [Member] \| Debentures, related to NEE's equity units - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	1.54%	1.55%
Long-term debt, gross	2,152	2,503
Capital Holdings [Member] \| Junior subordinated debentures - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	5.84%	6.16%
Long-term debt, gross	2,978	3,353
Capital Holdings [Member] \| Senior secured bonds - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	7.50%	7.50%
Long-term debt, gross	500	500
Capital Holdings [Member] \| Japanese yen denominated senior notes - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	5.1325%	5.1325%
Long-term debt, gross	83	95
Capital Holdings [Member] \| Japanese yen denominated term loans - variable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	1.83%	1.45%
Long-term debt, gross	459	419
Capital Holdings [Member] \| Fair value hedge adjustment [Member]
Debt Instrument [Line Items]
Long-term debt, gross	20	4
Capital Holdings [Member] \| Other long-term debt - primarily variable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	2.44%	1.27%
Long-term debt, gross	716	1,665
Capital Holdings [Member] \| Other long-term debt - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	2.70%	0.86%
Long-term debt, gross	510	150
NEER [Member]
Debt Instrument [Line Items]
Unamortized discount	(8)	(10)
Total long-term debt	7,867	7,667
Less current maturities of long-term debt	1,668	1,941
Long-term debt, excluding current maturities	6,199	5,726
NEER [Member] \| Senior secured limited-recourse bonds and notes - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	6.02%	5.84%
Long-term debt, gross	2,273	2,523
NEER [Member] \| Senior secured limited-recourse term loans - primarily variable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	3.12%	3.18%
Long-term debt, gross	4,242	3,874
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	1,100
NEER [Member] \| Other long-term debt - primarily variable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	3.71%	3.48%
Long-term debt, gross	656	808
NEER [Member] \| Canadian revolving credit facilities - variable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	2.33%	2.33%
Long-term debt, gross	$ 704	$ 472

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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