Debt (Schedule of Debt Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Less current maturities of long-term debt	$ 1,785	$ 4,138
Long-term debt, excluding current maturities	50,960	41,944
Repayment prior to maturity	1,785
FPL [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs and premium and discount	(191)	(182)
Total long-term debt	18,510	17,236
Less current maturities of long-term debt	536	354	[1]
Long-term debt, excluding current maturities	17,974	16,882	[1]
Repayment prior to maturity	536
FPL [Member] | First mortgage bonds - fixed [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 14,290	$ 13,090
Weighted-average interest rate	4.20%	4.32%
FPL [Member] | Pollution control, solid waste disposal and industrial development revenue bonds - primary variable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,407	$ 1,407
Weighted-average interest rate	0.15%	0.17%
Variable rate tax exempt bonds	$ 1,375
FPL [Member] | Senior Unsecured Notes - Primarily Variable
Debt Instrument [Line Items]
Long-term debt, gross	$ 2,697	$ 2,621
Weighted-average interest rate	1.37%	1.55%
Floating rate notes that permit individual noteholders to require repayment prior to maturity	$ 882
FPL [Member] | Other long-term debt - variable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 307	$ 300
Weighted-average interest rate	0.82%	0.70%
NEER [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs and premium and discount	$ (92)	$ (65)
Total long-term debt	7,419	4,647
Less current maturities of long-term debt	664	239
Long-term debt, excluding current maturities	6,755	4,408
NEER [Member] | Senior secured limited-recourse term loans - variable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 3,100	$ 2,621
Weighted-average interest rate	1.74%	1.99%
NEER [Member] | Senior secured limited-recourse long-term loans - fixed
Debt Instrument [Line Items]
Long-term debt, gross	$ 2,475	$ 704
Weighted-average interest rate	3.30%	3.59%
NEER [Member] | Other Long-Term Debt - Primarily Variable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 785	$ 450
Weighted-average interest rate	2.50%	2.72%
Capital Holdings [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs and premium and discount	$ (120)	$ (115)
Total long-term debt	26,816	24,199
Less current maturities of long-term debt	585	3,545
Long-term debt, excluding current maturities	26,231	20,654
Capital Holdings [Member] | Other long-term debt - variable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,245	$ 600
Weighted-average interest rate	0.64%	0.70%
Capital Holdings [Member] | Other long-term debt - fixed [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 186	$ 221
Weighted-average interest rate	0.92%	0.92%
Capital Holdings [Member] | Debentures - fixed [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 10,990	$ 11,540
Weighted-average interest rate	2.21%	2.86%
Capital Holdings [Member] | Debentures variable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 3,850	$ 1,225
Weighted-average interest rate	0.56%	0.80%
Capital Holdings [Member] | Debentures, related to NEE's equity units - fixed [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 6,000	$ 6,000
Weighted-average interest rate	1.46%	1.46%
Capital Holdings [Member] | Junior subordinated debentures - primarily fixed [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 3,723	$ 3,693
Weighted-average interest rate	4.54%	4.78%
Capital Holdings [Member] | Japanese yen denominated term loans - variable [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 582	$ 650
Weighted-average interest rate	1.49%	1.49%
Capital Holdings [Member] | Australian dollar denominated long-term debt - fixed [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 360	$ 385
Weighted-average interest rate	2.20%	2.20%
NEET [Member] | Other long-term debt - fixed [Member] | NEER [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,151	$ 937
Weighted-average interest rate	2.69%	3.09%

[1] Amounts have been retrospectively adjusted to reflect the merger of FPL and Gulf Power Company, see Note 6 – Merger of FPL and Gulf Power Company.