Quarterly Data (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condensed consolidated quarterly financial information [Abstract]
Operating revenues	$ 3,375	[1],[2]	$ 3,843	[1],[2]	$ 3,667	[1],[2]	$ 3,371	[1],[2]	$ 3,864	[1],[2]	$ 4,382	[1],[2]	$ 3,961	[1],[2]	$ 3,134	[1],[2]	$ 14,256	$ 15,341	$ 15,317
Operating income	732	[1],[2],[3]	742	[1],[2],[3]	1,000	[1],[2],[3]	803	[1],[2],[3]	1,086	[1],[2],[3]	902	[1],[2],[3]	858	[1],[2],[3]	414	[1],[2],[3]	3,276	3,261	3,227
Net income (loss)	429	[1],[2]	415	[1],[2]	607	[1],[2]	461	[1],[2]	667	[1],[2]	407	[1],[2]	580	[1],[2]	268	[1],[2]	1,911	1,923	1,957
Earnings per share (in dollars per share)	$ 1.02	[2],[4]	$ 0.99	[2],[4]	$ 1.46	[2],[4]	$ 1.12	[2],[4]	$ 1.60	[2],[4]	$ 0.98	[2],[4]	$ 1.39	[2],[4]	$ 0.64	[2],[4]	$ 4.59	$ 4.62	$ 4.77
Earnings per share - assuming dilution (in dollars per share)	$ 1.02	[2],[4]	$ 0.98	[2],[4]	$ 1.45	[2],[4]	$ 1.11	[2],[4]	$ 1.59	[2],[4]	$ 0.97	[2],[4]	$ 1.38	[2],[4]	$ 0.64	[2],[4]	$ 4.56	$ 4.59	$ 4.74
Dividends per share (in dollars per share)	$ 0.60	[2]	$ 0.60	[2]	$ 0.60	[2]	$ 0.60	[2]	$ 0.55	[2]	$ 0.55	[2]	$ 0.55	[2]	$ 0.55	[2]	$ 2.40	$ 2.20	$ 2.00
High common stock sales price (in dollars per share)	$ 72.21		$ 72.22		$ 68.96		$ 61.21		$ 61.20		$ 58.25		$ 58.98		$ 55.86
Low common stock sales price (in dollars per share)	$ 66.05		$ 65.95		$ 61.20		$ 58.57		$ 51.33		$ 49.00		$ 54.16		$ 51.54
OPERATING REVENUES																	14,256	15,341	15,317
FPL [Member]
Condensed consolidated quarterly financial information [Abstract]
Operating income	496	[1],[2]	719	[1],[2]	662	[1],[2]	481	[1],[2]	442	[1],[2]	656	[1],[2]	571	[1],[2]	406	[1],[2]	2,357	2,076	1,849
Net income (loss)	256	[1],[2]	392	[1],[2]	353	[1],[2]	239	[1],[2]	216	[1],[2]	347	[1],[2]	301	[1],[2]	205	[1],[2]	1,240	1,068	945
OPERATING REVENUES	$ 2,336	[1],[2]	$ 2,975	[1],[2]	$ 2,580	[1],[2]	$ 2,224	[1],[2]	$ 2,414	[1],[2]	$ 3,152	[1],[2]	$ 2,801	[1],[2]	$ 2,246	[1],[2]	$ 10,114	$ 10,613	$ 10,485

[1] The sum of the quarterly amounts may not equal the total for the year due to rounding.

[2] 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.

[3] Prior period amounts are restated to conform to the current year's presentation. See Note 1 - Basis of Presentation and Note 1 - Sale of Differential Membership Interests.

[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.