Debt (Schedule of Debt Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Less current maturities of long-term debt	$ 4,138	$ 2,124
Long-term debt, excluding current maturities	41,944	37,543
Repayment prior to maturity	4,138
FPL[Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs and discount	(168)	(156)
Total long-term debt	15,676	14,161
Less current maturities of long-term debt	54	30
Long-term debt, excluding current maturities	15,622	14,131
Repayment prior to maturity	54
FPL[Member] \| First mortgage bonds - fixed [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 13,090	$ 12,005
Weighted-average interest rate	4.32%	4.46%
FPL[Member] \| Pollution control, solid waste disposal and industrial development revenue bonds - primary variable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 948	$ 1,076
Weighted-average interest rate	0.12%	1.67%
Variable rate tax exempt bonds	$ 948
FPL[Member] \| Senior Unsecured Notes - Variable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,806	$ 1,236
Weighted-average interest rate	0.44%	2.18%
Floating rate notes that permit individual noteholders to require repayment prior to maturity	$ 556
Gulf Power [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs and discount	(14)	$ (14)
Total long-term debt	1,560	1,685
Less current maturities of long-term debt	300	175
Long-term debt, excluding current maturities	1,260	1,510
Gulf Power [Member] \| Other Long-Term Debt - Primarily Variable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 759	$ 709
Weighted-average interest rate	0.70%	1.93%
Variable rate tax exempt bonds	$ 426
Gulf Power [Member] \| Senior unsecured notes -fixed [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 815	$ 990
Weighted-average interest rate	4.05%	4.17%
NEER [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs and premium	$ (65)	$ (74)
Total long-term debt	4,647	4,622
Less current maturities of long-term debt	239	215
Long-term debt, excluding current maturities	4,408	4,407
NEER [Member] \| Other Long-Term Debt - Primarily Variable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 450	$ 440
Weighted-average interest rate	2.72%	3.78%
NEER [Member] \| Other long-term debt - fixed [Member] \| NEET [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 937	$ 837
Weighted-average interest rate	3.09%	3.50%
NEER [Member] \| Senior secured limited-recourse term loans - primarily variable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 3,325	$ 3,419
Weighted-average interest rate	2.33%	3.79%
Capital Holdings [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs, premium and discount	$ (115)	$ (139)
Total long-term debt	24,199	19,199
Less current maturities of long-term debt	3,545	1,704
Long-term debt, excluding current maturities	20,654	17,495
Capital Holdings [Member] \| Other long-term debt - variable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 600	$ 750
Weighted-average interest rate	0.70%	2.60%
Capital Holdings [Member] \| Other long-term debt - fixed [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 221	$ 524
Weighted-average interest rate	0.92%	2.00%
Capital Holdings [Member] \| Debentures - fixed [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 11,540	$ 9,550
Weighted-average interest rate	2.86%	3.05%
Capital Holdings [Member] \| Debentures variable [Domain]
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,225	$ 1,375
Weighted-average interest rate	0.80%	3.00%
Capital Holdings [Member] \| Debentures, related to NEE's equity units - fixed [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 6,000	$ 1,500
Weighted-average interest rate	1.46%	2.10%
Capital Holdings [Member] \| Junior subordinated debentures - primarily fixed [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 3,693	$ 4,643
Weighted-average interest rate	4.78%	5.13%
Capital Holdings [Member] \| Japanese yen denominated term loans - variable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 650	$ 645
Weighted-average interest rate	1.49%	3.10%
Capital Holdings [Member] \| Australian dollar denominated long-term debt - fixed [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 385	$ 351
Weighted-average interest rate	2.20%	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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