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Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | Earnings Per Share - The reconciliation of NEE's basic and diluted earnings per share attributable to NEE is as follows:
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
| (millions, except per share amounts)
Numerator - net income attributable to NEE | $ | 5,378 |  |  | $ | 2,912 |  |  | $ | 2,752 |
Denominator: |  |  |  |  |  |  |  |
Weighted-average number of common shares outstanding - basic | 468.8 |  |  | 463.1 |  |  | 450.5 |
Equity units, stock options, performance share awards, forward sale agreements and restricted stock(a) | 3.7 |  |  | 2.7 |  |  | 3.5 |
Weighted-average number of common shares outstanding - assuming dilution | 472.5 |  |  | 465.8 |  |  | 454.0 |
Earnings per share attributable to NEE: |  |  |  |  |  |  |
Basic | $ | 11.47 |  |  | $ | 6.29 |  |  | $ | 6.11 |
Assuming dilution | $ | 11.38 |  |  | $ | 6.25 |  |  | $ | 6.06 |
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(a) | Calculated using the treasury stock method. Performance share awards are included in diluted weighted-average number of common shares outstanding based upon what would be issued if the end of the reporting period was the end of the term of the award.
Nonvested Awards Activity | The activity in restricted stock and performance share awards for the year ended December 31, 2017 was as follows:
| Shares |  | Weighted- Average Grant Date Fair Value Per Share
Restricted Stock: |  |  |
Nonvested balance, January 1, 2017 | 556,648 |  |  | $ | 103.26 |
Granted | 237,662 |  |  | $ | 130.16 |
Vested | (261,940 | ) |  | $ | 101.31 |
Forfeited | (21,057 | ) |  | $ | 112.91 |
Nonvested balance, December 31, 2017 | 511,313 |  |  | $ | 116.36 |
Performance Share Awards: |  |  |  |
Nonvested balance, January 1, 2017 | 834,433 |  |  | $ | 95.76 |
Granted | 483,958 |  |  | $ | 107.39 |
Vested | (463,511 | ) |  | $ | 87.24 |
Forfeited | (46,472 | ) |  | $ | 100.38 |
Nonvested balance, December 31, 2017 | 808,408 |  |  | $ | 110.98 |
Assumptions used to estimate fair value of options | The fair value of the options is estimated on the date of the grant using the Black-Scholes option-pricing model and based on the following assumptions:
| 2017 |  | 2016 |  | 2015
Expected volatility(a) | 14.91% |  | 16.37% |  | 18.91%
Expected dividends | 3.16% |  | 3.16% |  | 3.11%
Expected term (years)(b) | 7.0 |  | 7.0 |  | 7.0
Risk-free rate | 2.23% |  | 1.50% |  | 1.84%
______________________
(a) | Based on historical experience.
(b) | Based on historical exercise and post-vesting cancellation experience adjusted for outstanding awards.
Stock option activity | Option activity for the year ended December 31, 2017 was as follows:
| Shares Underlying Options |  | Weighted- Average Exercise Price Per Share |  | Weighted- Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (millions)
Balance, January 1, 2017 | 2,505,208 |  |  | $ | 71.08 |  |  |  |  |
Granted | 407,216 |  |  | $ | 126.86 |  |  |  |  |
Exercised | (429,402 | ) |  | $ | 52.47 |  |  |  |  |
Balance, December 31, 2017 | 2,483,022 |  |  | $ | 83.45 |  |  | 5.6 |  | $ | 181 |
Exercisable, December 31, 2017 | 1,825,151 |  |  | $ | 70.17 |  |  | 4.5 |  | $ | 157 |
Schedule of Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) - The components of AOCI, net of tax, are as follows:
| Accumulated Other Comprehensive Income (Loss)
| Net Unrealized Gains (Losses) on Cash Flow Hedges |  | Net Unrealized Gains (Losses) on Available for Sale Securities |  | Defined Benefit Pension and Other Benefits Plans |  | Net Unrealized Gains (Losses) on Foreign Currency Translation |  | Other Comprehensive Income (Loss) Related to Equity Method Investee |  | Total
| (millions)
Balances, December 31, 2014 | $ | (156 | ) |  | $ | 218 |  |  | $ | (20 | ) |  | $ | (58 | ) |  | $ | (24 | ) |  | $ | (40 | )
Other comprehensive loss before reclassifications | (88 | ) |  | (7 | ) |  | (42 | ) |  | (27 | ) |  | — |  |  | (164 | )
Amounts reclassified from AOCI | 63 |  | (a) | (37 | ) | (b) | — |  |  | — |  |  | — |  |  | 26 |
Net other comprehensive loss | (25 | ) |  | (44 | ) |  | (42 | ) |  | (27 | ) |  | — |  |  | (138 | )
Less other comprehensive loss attributable to noncontrolling interests | (11 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (11 | )
Balances, December 31, 2015 | (170 | ) |  | 174 |  |  | (62 | ) |  | (85 | ) |  | (24 | ) |  | (167 | )
Other comprehensive income (loss) before reclassifications | — |  |  | 69 |  |  | (21 | ) |  | (5 | ) |  | 2 |  |  | 45 |
Amounts reclassified from AOCI | 70 |  | (a) | (18 | ) | (b) | — |  |  | — |  |  | — |  |  | 52 |
Net other comprehensive income (loss) | 70 |  |  | 51 |  |  | (21 | ) |  | (5 | ) |  | 2 |  |  | 97 |
Less other comprehensive income attributable to noncontrolling interests | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Balances, December 31, 2016 | (100 | ) |  | 225 |  |  | (83 | ) |  | (90 | ) |  | (22 | ) |  | (70 | )
Other comprehensive income before reclassifications | — |  |  | 127 |  |  | 44 |  |  | 24 |  |  | 2 |  |  | 197 |
Amounts reclassified from AOCI | 32 |  | (a) | (36 | ) | (b) | — |  |  | — |  |  | — |  |  | (4 | )
Net other comprehensive income | 32 |  |  | 91 |  |  | 44 |  |  | 24 |  |  | 2 |  |  | 193 |
Less other comprehensive income attributable to noncontrolling interests | 9 |  |  | — |  |  | — |  |  | 3 |  |  | — |  |  | 12 |
Balances, December 31, 2017 | $ | (77 | ) |  | $ | 316 |  |  | $ | (39 | ) |  | $ | (69 | ) |  | $ | (20 | ) |  | $ | 111 |
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(a) | Reclassified to interest expense and also to other - net in 2015 in NEE's consolidated statements of income. See Note 3 - Income Statement Impact of Derivative Instruments.
(b) | Reclassified to gains on disposal of investments and other property - net in NEE's consolidated statements of income.

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