Debt (Schedule of Debt Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Less current maturities of long-term debt	$ 2,124	$ 2,716
Long-term debt, excluding current maturities	37,543	26,782
Repayment prior to maturity	2,124
FPL[Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs and discount	(156)	(132)
Total long-term debt	14,161	11,783
Less current maturities of long-term debt	30	95
Long-term debt, excluding current maturities	14,131	11,688
Repayment prior to maturity	30
FPL[Member] \| First mortgage bonds - fixed [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 12,005	$ 10,626
Weighted-average interest rate	4.46%	4.60%
FPL[Member] \| Storm-recovery bonds - fixed [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 74
Weighted-average interest rate		5.26%
FPL[Member] \| Pollution control, solid waste disposal and industrial development revenue bonds - primary variable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,076	$ 1,022
Weighted-average interest rate	1.67%	2.04%
Variable rate tax exempt bonds	$ 948
FPL[Member] \| Senior Unsecured Notes - Variable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,236	$ 193
Weighted-average interest rate	2.18%	2.40%
Floating rate notes that permit individual noteholders to require repayment prior to maturity	$ 236
Gulf Power [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs and discount	(14)	$ 0
Total long-term debt	1,685	0
Less current maturities of long-term debt	175	0
Long-term debt, excluding current maturities	1,510	0
Gulf Power [Member] \| Other Long-Term Debt - Primarily Variable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 709	0
Weighted-average interest rate	1.93%
Variable rate tax exempt bonds	$ 269
Gulf Power [Member] \| Senior unsecured notes -fixed [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 990	0
Weighted-average interest rate	4.17%
NEER [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs and premium - net	$ (74)	(95)
Total long-term debt	4,622	5,024
Less current maturities of long-term debt	215	602
Long-term debt, excluding current maturities	4,407	4,422
NEER [Member] \| Other Long-Term Debt - Primarily Variable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 440	$ 601
Weighted-average interest rate	3.78%	2.57%
NEER [Member] \| Other long-term debt - fixed [Member] \| NEET [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 837	$ 325
Weighted-average interest rate	3.50%	3.73%
NEER [Member] \| Senior secured limited-recourse term loans - primarily variable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 3,419	$ 4,193
Weighted-average interest rate	3.79%	4.38%
Capital Holdings [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs and discount	$ 139	$ 86
Total long-term debt	19,199	12,691
Less current maturities of long-term debt	1,704	2,019
Long-term debt, excluding current maturities	17,495	10,672
Capital Holdings [Member] \| Other long-term debt - variable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 750	$ 0
Weighted-average interest rate	2.60%
Capital Holdings [Member] \| Other long-term debt - fixed [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 524	$ 543
Weighted-average interest rate	2.00%	1.95%
Capital Holdings [Member] \| Debentures - fixed [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 9,550	$ 4,300
Weighted-average interest rate	3.05%	3.21%
Capital Holdings [Member] \| Debentures variable [Domain]
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,375	$ 2,341
Weighted-average interest rate	3.00%	3.11%
Capital Holdings [Member] \| Debentures, related to NEE's equity units - fixed [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,500	$ 1,500
Weighted-average interest rate	2.10%	1.65%
Capital Holdings [Member] \| Junior subordinated debentures - primarily fixed [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 4,643	$ 3,456
Weighted-average interest rate	5.13%	4.99%
Capital Holdings [Member] \| Japanese yen denominated term loans - variable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 645	$ 637
Weighted-average interest rate	3.10%	3.10%
Capital Holdings [Member] \| Australian dollar denominated long-term debt - fixed [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 351	$ 0
Weighted-average interest rate	2.59%
Other Current Liabilities [Member]
Debt Instrument [Line Items]
Current other liabilities	$ 133
Other Current Liabilities [Member] \| NEER [Member] \| Other Long Term Debt [Member]
Debt Instrument [Line Items]
Current other liabilities	$ 463

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Floating Rate Notes That Permit Individual Noteholders to Require Repayment Prior to Maturity

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Liabilities Associated with Assets Held-for-Sale

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Variable Rate Tax Exempt Bonds

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