Segment Information (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017		Dec. 31, 2017
Segment Reporting Information [Line Items]
OPERATING REVENUES		$ 3,863	$ 3,972	[1]
Operating expenses (income) - net		2,816	1,610	[1]
Net income (loss) attributable to NEE		$ 4,428	1,583	[1]
Deemed capital structure of NextEra Energy Resources		70.00%
Total assets		$ 94,284			$ 97,827
FPL [Member]
Segment Reporting Information [Line Items]
OPERATING REVENUES		2,620	2,527
Operating expenses (income) - net		1,912	1,716
Net income (loss) attributable to NEE	[2]	484	445	[3]
Total assets		50,895			50,244
Operating Segments [Member] | FPL [Member]
Segment Reporting Information [Line Items]
OPERATING REVENUES		2,620	2,527
Operating expenses (income) - net		1,912	1,716
Net income (loss) attributable to NEE		484	445
Total assets		50,895			50,244
Operating Segments [Member] | NextEra Energy Resources [Member]
Segment Reporting Information [Line Items]
Operating revenues		1,247	1,424
Operating expenses (income) - net		861	931
Net income (loss) attributable to NEE		3,926	476
Total assets		42,171			45,549
Corporate, Non-Segment [Member] | Corporate and Other [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating revenues		(4)	21
Operating expenses (income) - net		43	(1,037)
Net income (loss) attributable to NEE		18	$ 662
Total assets		$ 1,218			$ 2,034

[1] Prior period amounts have been retrospectively adjusted as discussed in Note 3 - Amendments to Presentation of Retirement Benefits.

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

[3] Prior period amounts have been retrospectively adjusted as discussed in Note 10 - Restricted Cash.