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Debt (Narrative) (Details) - USD ($) | 1 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2016 | Sep. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |
Weighted-average interest rate of commercial paper and short-tem borrowings (in hundredths) |  |  | 1.68% | 1.07%
Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Available capacity |  |  | $ 9,900,000,000 |
Letter of Credit [Member] | Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Available capacity |  |  | 80,000,000 |
Revolving Credit Facility [Member] | Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Available capacity |  |  | 9,800,000,000 |
Revolving Credit Facility, Issuance of Letters of Credit [Member] | Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Available capacity |  |  | $ 3,000,000,000 |
FPL[Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted-average interest rate of commercial paper and short-tem borrowings (in hundredths) |  |  | 1.68% | 1.07%
FPL[Member] | Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Available capacity |  |  | $ 3,100,000,000 |
FPL[Member] | Letter of Credit [Member] | Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Available capacity |  |  | 0 |
FPL[Member] | Revolving Credit Facility [Member] | Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Available capacity |  |  | 3,100,000,000 |
FPL[Member] | Revolving Credit Facility, Issuance of Letters of Credit [Member] | Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Available capacity |  |  | $ 700,000,000 |
NEE Equity Units 2015 [Member] |  |  |  |
Sale of equity units [Abstract] |  |  |  |
Amount of equity units sold |  | $ 700,000,000 |  |
Stated amount of each equity unit (in dollars per share) |  | $ 50 |  |
Undivided beneficial ownership interest per debenture (in hundredths) |  | 5.00% |  |
Principal amount of each debenture |  | $ 1,000 |  |
Price per share of stock purchase contract - low range (in dollars per share) |  | $ 95.35 |  |
Price per share of stock purchase contract - high range (in dollars per share) |  | $ 114.42 |  |
Number of shares (subject to antidilution adjustments) if purchased on final settlement date at less than or equal to low range threshold (in shares) |  | 0.5293 |  |
Number of shares (subject to antidilution adjustments) if purchased on the final settlement date at equal to or greater than high range threshold (in shares) |  | 0.4412 |  |
Trading period (in days) over which the market value is determined by reference to the average closing prices of the common stock |  | 20 days |  |
Rate of total annual distributions on equity units (in hundredths) |  | 6.371% |  |
Interest rate |  | 2.36% |  |
Rate of payments on stock purchase contracts (in hundredths) |  | 4.011% |  |
NEE Equity Units 2016 [Member] |  |  |  |
Sale of equity units [Abstract] |  |  |  |
Amount of equity units sold | $ 1,500,000,000 |  |  |
Stated amount of each equity unit (in dollars per share) | $ 50 |  |  |
Undivided beneficial ownership interest per debenture (in hundredths) | 5.00% |  |  |
Principal amount of each debenture | $ 1,000 |  |  |
Number of shares (subject to antidilution adjustments) if purchased on final settlement date at less than or equal to low range threshold (in shares) | 0.3931 |  |  |
Number of shares (subject to antidilution adjustments) if purchased on the final settlement date at equal to or greater than high range threshold (in shares) | 0.3144 |  |  |
Trading period (in days) over which the market value is determined by reference to the average closing prices of the common stock | 20 days |  |  |
Rate of total annual distributions on equity units (in hundredths) | 6.123% |  |  |
Interest rate | 1.65% |  |  |
Rate of payments on stock purchase contracts (in hundredths) | 4.473% |  |  |
NEE Equity Units 2016 [Member] | Minimum [Member] |  |  |  |
Sale of equity units [Abstract] |  |  |  |
Price per share of stock purchase contract (in dollars per share) | $ 127.63 |  |  |
NEE Equity Units 2016 [Member] | Maximum [Member] |  |  |  |
Sale of equity units [Abstract] |  |  |  |
Price per share of stock purchase contract (in dollars per share) | $ 159.54 |  |  |

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