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Common and Preferred Stock (Earnings Per Share) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Reconciliation of basic and diluted earnings per share of common stock [Abstract]                      
Numerator - net income $ 667 [1],[2] $ 407 [1],[2] $ 580 [1],[2] $ 268 [1],[2] $ 263 [1],[2] $ 720 [1],[2] $ 417 [1],[2] $ 556 [1],[2] $ 1,923 $ 1,957 $ 1,615
Denominator:                      
Weighted-average number of common shares outstanding - basic (in shares)                 416.6 410.3 404.4
Performance share awards, options, restricted stock, equity units and warrants (in shares)                 2.4 [3] 2.7 [3] 2.8 [3]
Weighted-average number of common shares outstanding - assuming dilution (in shares)                 419.0 413.0 407.2
Earnings per share of common stock:                      
Basic (in dollars per share) $ 1.60 [1],[4] $ 0.98 [1],[4] $ 1.39 [1],[4] $ 0.64 [1],[4] $ 0.64 [1],[4] $ 1.75 [1],[4] $ 1.02 [1],[4] $ 1.36 [1],[4] $ 4.62 $ 4.77 $ 3.99
Assuming dilution (in dollars per share) $ 1.59 [1],[4] $ 0.97 [1],[4] $ 1.38 [1],[4] $ 0.64 [1],[4] $ 0.63 [1],[4] $ 1.74 [1],[4] $ 1.01 [1],[4] $ 1.36 [1],[4] $ 4.59 $ 4.74 $ 3.97
Antidilutive securities (in shares)                 14.6 9.1 0.8
[1] In the opinion of NEE and FPL, all adjustments, which consist of normal recurring accruals necessary to present a fair statement of the amounts shown for such periods, have been made. Results of operations for an interim period generally will not give a true indication of results for the year.
[2] The sum of the quarterly amounts may not equal the total for the year due to rounding.
[3] 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. Options, performance share awards, restricted stock, equity units and warrants are included in diluted weighted-average number of common shares outstanding by applying the treasury stock method.
[4] The sum of the quarterly amounts may not equal the total for the year due to rounding and changes in weighted-average number of common shares outstanding.