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, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Reconciliation of basic and diluted earnings per share of common stock [Abstract]
Income from Continuing Operations Attributable to Parent																	$ 2,465	[1]	$ 1,677	[1],[2]	$ 1,911	[1]
Denominator:
Weighted-average number of common shares outstanding - basic (in shares)																	434.4		424.2		416.7
Equity units, performance share awards, options, forward sale agreements and restricted stock (in shares)																	5.7	[3]	2.8	[3]	2.5	[3]
Weighted-average number of common shares outstanding - assuming dilution (in shares)																	440.1		427.0		419.2
Earnings per share of common stock:
Basic EPS	$ 2.03	[4],[5]	$ 1.52	[4],[5]	$ 1.13	[4],[5]	$ 0.99	[4],[5]	$ 0.76	[4],[5],[6]	$ 1.65	[4],[5],[6]	$ 1.45	[4],[5],[6]	$ 0.10	[4],[5],[6]	$ 5.67		$ 3.95	[2]	$ 4.59
Diluted EPS	$ 2.00	[4],[5]	$ 1.50	[4],[5]	$ 1.12	[4],[5]	$ 0.98	[4],[5]	$ 0.75	[4],[5]	$ 1.64	[4],[5]	$ 1.44	[4],[5]	$ 0.10	[4],[5],[6],[7]	$ 5.60		$ 3.93	[2]	$ 4.56
Antidilutive securities (in shares)																	2.6		7.1		11.4

[1] Calculated as income from continuing operations less net income attributable to noncontrolling interests from NEE's consolidated statements of income.

[2] 2013 amounts were reclassified to conform to current year's presentation. See Note 4 - Nonrecurring Fair Value Measurements.

[3] 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.

[4] 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.

[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.

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

[7] First quarter of 2013 was reclassified to conform to current year's presentation. See Note 4 - Nonrecurring Fair Value Measurements.