Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Condensed consolidated quarterly financial information [Abstract]
Operating revenues	$ 4,069	$ 4,954	$ 4,358	$ 4,104	$ 4,664	$ 4,654	$ 4,029	$ 3,674	$ 17,486		$ 17,021		$ 15,136
Operating income	876	1,481	1,146	1,129	1,532	1,163	951	738	4,632		4,384		3,241
Net income	510	882	720	650	884	664	492	430	2,762		2,469		1,908
Net income (loss) attributable to parent	$ 507	$ 879	$ 716	$ 650	$ 884	$ 660	$ 492	$ 430	$ 2,752		$ 2,465		$ 1,908
Basic EPS - Net income (in dollars per share)	$ 1.10	$ 1.94	$ 1.61	$ 1.47	$ 2.03	$ 1.52	$ 1.13	$ 0.99	$ 6.11		$ 5.67		$ 4.50
Diluted EPS - Net income (in dollars per share)	1.10	1.93	1.59	1.45	2.00	1.50	1.12	0.98	6.06		5.60		4.47
Dividends per share of common stock (in dollars per share)	0.770	0.770	0.770	0.770	0.725	0.725	0.725	0.725	$ 3.08		$ 2.90		$ 2.64
High common stock sales price (in dollars per share)	105.85	109.98	106.63	112.64	110.84	102.46	102.51	96.13
Low common stock sales price (in dollars per share)	$ 95.84	$ 93.74	$ 97.23	$ 97.48	$ 90.33	$ 91.79	$ 93.28	$ 83.97
FPL [Member]
Condensed consolidated quarterly financial information [Abstract]
Operating revenues	$ 2,839	$ 3,274	$ 2,996	$ 2,541	$ 2,682	$ 3,315	$ 2,889	$ 2,535	$ 11,651		$ 11,421		$ 10,445
Operating income	674	855	780	667	580	834	782	632	2,977		2,828		2,539
Net income (loss) attributable to parent	$ 365	$ 489	$ 435	$ 359	$ 286	$ 462	$ 423	$ 347	$ 1,648	[1]	$ 1,517	[1]	$ 1,349	[1]

[1] FPL's comprehensive income is the same as reported net income