Summarized Financial Information of NEECH - Income Statement (Details) - USD ($) $ 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
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 expenses									(12,854)	(12,637)	(11,895)
Interest expense									(1,211)	(1,261)	(1,121)
Equity in earnings of subsidiaries									0	0	0
Other income (deductions) - net									569	522	334
Income from continuing operations before income taxes									3,990	3,645	2,454
Income tax expense (benefit)									1,228	1,176	777
Income (loss) from continuing operations									2,762	2,469	1,677
Gain from discontinued operations, net of income taxes									0	0	231
Net Income (loss)	510	882	720	650	884	664	492	430	2,762	2,469	1,908
Net income attributable to noncontrolling interest									10	4	0
Net income (loss) attributable to parent	$ 507	$ 879	$ 716	$ 650	$ 884	$ 660	$ 492	$ 430	2,752	2,465	1,908
NEE (Guarantor) [Member]
Operating revenues									0	0	0
Operating expenses									(17)	(19)	(18)
Interest expense									(4)	(6)	(8)
Equity in earnings of subsidiaries									2,754	2,494	1,915
Other income (deductions) - net									1	1	2
Income from continuing operations before income taxes									2,734	2,470	1,891
Income tax expense (benefit)									(18)	5	(2)
Income (loss) from continuing operations									2,752	2,465	1,893
Gain from discontinued operations, net of income taxes									0	0	15
Net Income (loss)									2,752	2,465	1,908
Net income attributable to noncontrolling interest									0	0	0
Net income (loss) attributable to parent									2,752	2,465	1,908
NEECH [Member]
Operating revenues									5,849	5,614	4,703
Operating expenses									(4,142)	(4,039)	(3,983)
Interest expense									(764)	(819)	(705)
Equity in earnings of subsidiaries									0	0	0
Other income (deductions) - net									498	487	281
Income from continuing operations before income taxes									1,441	1,243	296
Income tax expense (benefit)									299	262	(55)
Income (loss) from continuing operations									1,142	981	351
Gain from discontinued operations, net of income taxes									0	0	216
Net Income (loss)									1,142	981	567
Net income attributable to noncontrolling interest									10	4	0
Net income (loss) attributable to parent									1,132	977	567
Other [Member]
Operating revenues									11,637	11,407	10,433
Operating expenses									(8,695)	(8,579)	(7,894)
Interest expense									(443)	(436)	(408)
Equity in earnings of subsidiaries									(2,754)	(2,494)	(1,915)
Other income (deductions) - net									70	34	51
Income from continuing operations before income taxes									(185)	(68)	267
Income tax expense (benefit)									947	909	834
Income (loss) from continuing operations									(1,132)	(977)	(567)
Gain from discontinued operations, net of income taxes									0	0	0
Net Income (loss)									(1,132)	(977)	(567)
Net income attributable to noncontrolling interest									0	0	0
Net income (loss) attributable to parent									$ (1,132)	$ (977)	$ (567)