Debt (Schedule of Debt Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Less current maturities of long-term debt	$ 2,604	$ 2,220
Long-term debt, excluding current maturities	27,818	26,681
liabilities associated with assets held-for-sale [Member]
Debt Instrument [Line Items]
Total long-term debt	373	938
FPL [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs and discount	(108)	(114)
Total long-term debt	10,072	10,020
Less current maturities of long-term debt	367	64
Long-term debt, excluding current maturities	$ 9,705	$ 9,956
FPL [Member] \| First mortgage bonds - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	4.78%	4.77%
Long-term debt, gross	$ 8,690	$ 8,690
FPL [Member] \| Storm-recovery bonds - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	5.26%	5.26%
Long-term debt, gross	$ 210	$ 273
FPL [Member] \| Pollution control, solid waste disposal and industrial development revenue bonds - variable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	0.77%	0.04%
Long-term debt, gross	$ 778	$ 718
FPL [Member] \| Other long-term debt - variable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	1.66%	1.11%
Long-term debt, gross	$ 450	$ 400
FPL [Member] \| Other long-term debt - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	5.09%	5.06%
Long-term debt, gross	$ 52	$ 53
Capital Holdings [Member]
Debt Instrument [Line Items]
Fair value hedge adjustment	8	24
Unamortized debt issuance costs and discount	(101)	(94)
Total long-term debt	11,206	10,567
Less current maturities of long-term debt	1,724	667
Long-term debt, excluding current maturities	$ 9,482	$ 9,900
Capital Holdings [Member] \| Other long-term debt - variable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	1.77%	1.81%
Long-term debt, gross	$ 60	$ 1,513
Capital Holdings [Member] \| Other long-term debt - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	2.45%	4.55%
Long-term debt, gross	$ 924	$ 1,307
Capital Holdings [Member] \| Debentures - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	2.87%	3.15%
Long-term debt, gross	$ 4,100	$ 3,100
Capital Holdings [Member] \| Debentures, related to NEE's equity units - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	1.88%	1.98%
Long-term debt, gross	$ 2,200	$ 1,200
Capital Holdings [Member] \| Junior subordinated debentures - primarily fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	5.40%	5.84%
Long-term debt, gross	$ 3,460	$ 2,978
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	$ 85	$ 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	$ 470	$ 456
NEER [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs and premium - net	(168)	(131)
Total long-term debt	9,144	8,314
Less current maturities of long-term debt	513	1,489
Long-term debt, excluding current maturities	$ 8,631	$ 6,825
NEER [Member] \| Senior secured limited-recourse bonds and notes - fixed [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	6.00%	5.88%
Long-term debt, gross	$ 2,091	$ 2,203
NEER [Member] \| Senior secured limited-recourse term loans - primarily variable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	2.78%	2.51%
Long-term debt, gross	$ 4,959	$ 3,969
NEER [Member] \| Other long-term debt - primarily variable [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	2.97%	2.72%
Long-term debt, gross	$ 2,262	$ 2,273
Wholly-Owned Subsidiary of NEER [Member]
Debt Instrument [Line Items]
Debt collateralized by third party note receivable	$ 490

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