Quarterly Data (Unaudited) (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
Condensed consolidated quarterly financial information [Abstract]
Operating revenues	$ 4,664	[1],[2]	$ 4,654	[1],[2]	$ 4,029	[1],[2]	$ 3,674	[1],[2]	$ 3,630	[1],[2]	$ 4,394	[1],[2]	$ 3,833	[1],[2]	$ 3,279	[1],[2]	$ 17,021	$ 15,136		$ 14,256
Operating income	1,532	[1],[2]	1,163	[1],[2]	951	[1],[2]	738	[1],[2]	641	[1],[2]	1,185	[1],[2]	981	[1],[2]	434	[1],[2],[3]	4,384	3,241		3,276
Income (loss) from continuing operations	884	[1],[2]	664	[1],[2]	492	[1],[2]	430	[1],[2]	327	[1],[2]	698	[1],[2]	610	[1],[2]	41	[1],[2],[3],[4]	2,469	1,677	[5]	1,911
Net income	884	[1],[2]	664	[1],[2]	492	[1],[2]	430	[1],[2]	327	[1],[2]	698	[1],[2]	610	[1],[2]	272	[1],[2],[3],[6]	2,469	1,908		1,911
Net income attributable to noncontrolling interest																	(4)	0		0
Net income (loss) attributable to parent	884	[1],[2]	660	[1],[2]	492	[1],[2]	430	[1],[2]									2,465	1,908		1,911
Basic EPS - Continuing operations	$ 2.03	[1],[7]	$ 1.52	[1],[7]	$ 1.13	[1],[7]	$ 0.99	[1],[7]	$ 0.76	[1],[3],[7]	$ 1.65	[1],[3],[7]	$ 1.45	[1],[3],[7]	$ 0.10	[1],[3],[7]	$ 5.67	$ 3.95	[8]	$ 4.59
Basic EPS - Net income	$ 2.03	[1],[7]	$ 1.52	[1],[7]	$ 1.13	[1],[7]	$ 0.99	[1],[7]	$ 0.76	[1],[7]	$ 1.65	[1],[7]	$ 1.45	[1],[7]	$ 0.65	[1],[3],[6],[7]	$ 5.67	$ 4.50		$ 4.59
Diluted EPS - Continuing operations	$ 2.00	[1],[7]	$ 1.50	[1],[7]	$ 1.12	[1],[7]	$ 0.98	[1],[7]	$ 0.75	[1],[7]	$ 1.64	[1],[7]	$ 1.44	[1],[7]	$ 0.10	[1],[3],[4],[7]	$ 5.60	$ 3.93	[8]	$ 4.56
Diluted EPS - Net income	$ 2.00	[1],[7]	$ 1.50	[1],[7]	$ 1.12	[1],[7]	$ 0.98	[1],[7]	$ 0.75	[1],[7]	$ 1.64	[1],[7]	$ 1.44	[1],[7]	$ 0.64	[1],[3],[6],[7]	$ 5.60	$ 4.47		$ 4.56
Dividends per share of common stock	$ 0.725	[1]	$ 0.725	[1]	$ 0.725	[1]	$ 0.725	[1]	$ 0.66	[1]	$ 0.66	[1]	$ 0.66	[1]	$ 0.66	[1]	$ 2.90	$ 2.64		$ 2.40
High common stock sales price (in dollars per share)	$ 110.84		$ 102.46		$ 102.51		$ 96.13		$ 89.75		$ 88.39		$ 82.65		$ 77.79
Low common stock sales price (in dollars per share)	$ 90.33		$ 91.79		$ 93.28		$ 83.97		$ 78.97		$ 78.81		$ 74.78		$ 69.81
FPL [Member]
Condensed consolidated quarterly financial information [Abstract]
Operating revenues	2,682	[1],[2]	3,315	[1],[2]	2,889	[1],[2]	2,535	[1],[2]	2,541	[1],[2]	3,020	[1],[2]	2,696	[1],[2]	2,188	[1],[2]	11,421	10,445		10,114
Operating income	580	[1],[2]	834	[1],[2]	782	[1],[2]	632	[1],[2]	495	[1],[2]	778	[1],[2]	724	[1],[2]	543	[1],[2]	2,828	2,539		2,357
Net income (loss) attributable to parent	$ 286	[1],[2]	$ 462	[1],[2]	$ 423	[1],[2]	$ 347	[1],[2]	$ 248	[1],[2]	$ 422	[1],[2]	$ 391	[1],[2]	$ 288	[1],[2]	$ 1,517	$ 1,349		$ 1,240

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

[5] 2013 amounts were reclassified to conform to current year's presentation. See Note 4 - Nonrecurring Fair Value Measurements.

[6] First quarter of 2013 includes an after-tax gain from discontinued operations. See Note 6.

[7] 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.

[8] 2013 amounts were reclassified to conform to current year's presentation. See Note 4 - Nonrecurring Fair Value Measurements.