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Equity (Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 24, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Reconciliation of basic and diluted earnings per share of common stock [Abstract]          
Net income (loss) attributable to NEE   $ 1,234 $ 781 [1] $ 1,914 $ 5,212 [1]
Adjustment for the impact of dilutive securities at NEP   0 (15) 0 (24)
Net income attributable to NEE - assuming dilution   $ 1,234 $ 766 $ 1,914 $ 5,188
Denominator:          
Weighted-average number of common shares outstanding - basic   478.9 471.1 [1] 478.6 470.9 [1]
Equity units, stock options, performance share awards and restricted stock   3.9 4.1 3.7 3.8
Weighted-average number of common shares outstanding - assuming dilution   482.8 475.2 [1] 482.3 474.7 [1]
Earnings per share attributable to NEE:(a)          
Basic (in dollars per share)   $ 2.58 $ 1.66 [1] $ 4.00 $ 11.07 [1]
Assuming dilution (in dollars per share)   $ 2.56 $ 1.61 [1] $ 3.97 $ 10.93 [1]
Antidilutive securities (in shares)   0.5 0.3 0.4 0.3
Subsequent Event [Member] | NextEra Energy Partners [Member]          
Conversion of Stock [Line Items]          
Percentage of shares converted 33.33%        
[1] Amounts have been retrospectively adjusted for an accounting standards update related to leases.