Common Shareholders' Equity (Earnings Per Share) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Reconciliation of basic and diluted earnings per share of common stock [Abstract]
Income (loss) from continuing operations	$ 327	[1],[2]	$ 698	[1],[2]	$ 610	[1],[2]	$ 84	[1],[2],[3]	$ 1,720		$ 1,911		$ 1,923
Denominator:
Weighted-average number of common shares outstanding - basic (in shares)									424.2		416.7		416.6
Performance share awards, options, restricted stock and equity units (in shares)									2.8	[4]	2.5	[4]	2.4	[4]
Weighted-average number of common shares outstanding - assuming dilution (in shares)									427.0		419.2		419.0
Earnings per share of common stock:
Basic EPS	$ 0.76	[1],[5]	$ 1.65	[1],[5]	$ 1.45	[1],[5]	$ 0.20	[1],[3],[5]	$ 4.06		$ 4.59		$ 4.62
Diluted EPS	$ 0.75	[1],[5]	$ 1.64	[1],[5]	$ 1.44	[1],[5]	$ 0.20	[1],[3],[5]	$ 4.03		$ 4.56		$ 4.59
Antidilutive securities (in shares)									7.1		11.4		14.6

[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] First quarter of 2013 includes impairment and other related charges. See Note 4 - Nonrecurring Fair Value Measurements.

[4] 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 and equity units are included in diluted weighted-average number of common shares outstanding by applying the treasury stock method.

[5] 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.