Segment Information (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018	Sep. 30, 2017		Dec. 31, 2017
Segment Reporting Information [Line Items]
OPERATING REVENUES		$ 4,418	$ 4,808	[1]	$ 12,351	$ 13,185	[1]
Operating expenses (income) - net		3,448	3,457	[1]	9,172	8,196	[1]
Net income (loss) attributable to NEE		$ 1,007	847	[1]	$ 6,229	3,223	[1]
Deemed capital structure of NextEra Energy Resources		70.00%			70.00%
Total assets		$ 98,603			$ 98,603			$ 97,827
FPL [Member]
Segment Reporting Information [Line Items]
OPERATING REVENUES		3,399	3,477		8,927	9,095
Operating expenses (income) - net		2,482	2,455		6,381	6,322
Net income (loss) attributable to NEE	[2]	654	566		1,764	1,537
Total assets		52,978			52,978			50,244
Operating Segments [Member] | FPL [Member]
Segment Reporting Information [Line Items]
OPERATING REVENUES		3,399	3,477		8,927	9,095
Operating expenses (income) - net		2,482	2,455		6,381	6,322
Net income (loss) attributable to NEE		654	566		1,764	1,537
Total assets		52,978			52,978			50,244
Operating Segments [Member] | NextEra Energy Resources [Member]
Segment Reporting Information [Line Items]
Operating revenues		1,020	1,333		3,429	4,052
Operating expenses (income) - net		924	964		2,663	2,852
Net income (loss) attributable to NEE		214	292		4,414	1,069
Total assets		43,681			43,681			45,549
Corporate, Non-Segment [Member] | Corporate and Other [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating revenues		(1)	(2)		(5)	38
Operating expenses (income) - net		42	38		128	(978)
Net income (loss) attributable to NEE		139	$ (11)		51	$ 617
Total assets		$ 1,944			$ 1,944			$ 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.