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Equity (Earnings Per Share) (Details) $ / shares in Units, $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 14, 2020 shares | Mar. 31, 2021 USD ($) $ / shares shares | Mar. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2020 shares | Oct. 26, 2020 shares
Reconciliation of basic and diluted earnings per share of common stock [Abstract] |  |  |  |  |
Numerator - net income attributable to NEE(a) | $ |  | $ 1,666 | $ 421 |  |
Denominator: |  |  |  |  |
Weighted-average number of common shares outstanding - basic |  | 1,961,600,000 | 1,957,000,000.0 |  |
Equity units, stock options, performance share awards and restricted stock |  | 11,400,000 | 10,000,000.0 |  |
Weighted-average number of common shares outstanding - assuming dilution |  | 1,973,000,000.0 | 1,967,000,000.0 |  |
Earnings per share attributable to NEE: |  |  |  |  |
Basic (in dollars per share) | $ / shares |  | $ 0.85 | $ 0.21 |  |
Assuming dilution (in dollars per share) | $ / shares |  | $ 0.84 | $ 0.21 |  |
Class of Stock [Line Items] |  |  |  |  |
Antidilutive securities (in shares) |  | 58,400,000 | 24,700,000 |  |
Stock split, conversion ratio | 4 |  |  |  |
Common stock, shares authorized (in shares) | 800,000,000 | 3,200,000,000 |  | 3,200,000,000 | 3,200,000,000

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