Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Segment Reporting Information [Line Items]
Deemed capital structure of NextEra Energy Resources (in hundredths)	70.00%																70.00%
Percentage of operating revenues derived from the sale of electricity (in hundredths)																	93.00%		95.00%		95.00%
Maximum percentage of operating revenues from foreign sources (in hundredths)																	1.00%		1.00%		1.00%
Maximum percentage of long-lived assets located in foreign countries (in hundredths)	4.00%								2.00%								4.00%		2.00%
Operating revenues	$ 3,375	[1],[2]	$ 3,843	[1],[2]	$ 3,667	[1],[2]	$ 3,371	[1],[2]	$ 3,864	[1],[2]	$ 4,382	[1],[2]	$ 3,961	[1],[2]	$ 3,134	[1],[2]	$ 14,256		$ 15,341		$ 15,317
Operating expenses																	10,980		12,080	[3]	12,090	[3]
Interest expense																	1,038		1,035		979
Interest income																	86		79		91
Depreciation and amortization																	1,518		1,567		1,788
Equity in earnings of equity method investees																	13		55		58
Income tax expense (benefit)																	692		529		532
Net income (loss)	429	[1],[2]	415	[1],[2]	607	[1],[2]	461	[1],[2]	667	[1],[2]	407	[1],[2]	580	[1],[2]	268	[1],[2]	1,911		1,923		1,957
Capital expenditures, independent power and other investments and nuclear fuel purchases																	9,461		6,628		5,846
Property, plant and equipment	64,917								57,552								64,917		57,552
Accumulated depreciation and amortization	15,504								15,062								15,504		15,062
Total assets	64,439								57,188								64,439		57,188
Investments in equity method investees	0								0								0		0
Sale of natural gas-fired generating assets																	0		151		0
Impairment charges																	0		51		19
Assets Held-for-sale	335								0								335		0
FPL [Member]
Segment Reporting Information [Line Items]
Operating revenues																	10,114		10,613		10,485
Operating expenses																	7,757		8,537		8,636
Interest expense																	417		387		361
Interest income																	6		3		0
Depreciation and amortization																	659		798		1,008
Equity in earnings of equity method investees																	0		0		0
Income tax expense (benefit)																	752		654		580
Net income (loss)																	1,240		1,068		945
Capital expenditures, independent power and other investments and nuclear fuel purchases																	4,285		3,502		2,706
Property, plant and equipment	38,249								35,170								38,249		35,170		32,423
Accumulated depreciation and amortization	10,698								10,916								10,698		10,916		10,871
Total assets	34,853								31,816								34,853		31,816		28,698
Investments in equity method investees	0								0								0		0		0
NextEra Energy Resources [Member]
Segment Reporting Information [Line Items]
Deemed capital structure of NextEra Energy Resources (in hundredths)	70.00%																70.00%
Operating revenues																	3,895	[4]	4,502	[4]	4,636	[4]
Operating expenses																	3,024	[4],[5]	3,351	[4],[5],[6]	3,302	[4],[5]
Interest expense																	474	[4]	530	[4]	515	[4]
Interest income																	20	[4]	23	[4]	21	[4]
Depreciation and amortization																	818	[4]	736	[4]	759	[4]
Equity in earnings of equity method investees																	19	[4]	55	[4]	58	[4]
Income tax expense (benefit)																	(7)	[4],[7]	(24)	[4],[7]	(11)	[4],[7]
Net income (loss)																	687	[4]	774	[4],[6],[8]	980	[4]
Capital expenditures, independent power and other investments and nuclear fuel purchases																	4,681	[4]	2,774	[4]	3,072	[4]
Property, plant and equipment	25,333	[4]							21,482	[4]							25,333	[4]	21,482	[4]	21,304	[4]
Accumulated depreciation and amortization	4,535	[4]							3,914	[4]							4,535	[4]	3,914	[4]	4,073	[4]
Total assets	27,139	[4],[9]							23,459	[4]							27,139	[4],[9]	23,459	[4]	22,389	[4]
Investments in equity method investees	243	[4]							193	[4]							243	[4]	193	[4]	217	[4]
Sale of natural gas-fired generating assets																			92
Impairment charges																			51
Impairment charges, after-tax																			31
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating revenues																	247		226		196
Operating expenses																	199		192		152
Interest expense																	147		118		103
Interest income																	60		53		70
Depreciation and amortization																	41		33		21
Equity in earnings of equity method investees																	(6)		0		0
Income tax expense (benefit)																	(53)		(101)	[10]	(37)
Net income (loss)																	(16)		81	[8]	32
Capital expenditures, independent power and other investments and nuclear fuel purchases																	495		352		68
Property, plant and equipment	1,335								900								1,335		900		494
Accumulated depreciation and amortization	271								232								271		232		202
Total assets	2,447								1,913								2,447		1,913		1,907
Investments in equity method investees	19								9								19		9		10
Sale of natural gas-fired generating assets																			6
Deferred state tax benefit related to recent state tax law changes																			64
Deferred tax benefit related to dissolution of subsidiary																			41
Total Reporting Segments [Member]
Segment Reporting Information [Line Items]
Operating revenues																	14,256		15,341		15,317
Operating expenses																	10,980	[5]	12,080	[5],[6]	12,090	[5]
Interest expense																	1,038		1,035		979
Interest income																	86		79		91
Depreciation and amortization																	1,518		1,567		1,788
Equity in earnings of equity method investees																	13		55		58
Income tax expense (benefit)																	692		529	[10]	532
Net income (loss)																	1,911		1,923	[6],[8]	1,957
Capital expenditures, independent power and other investments and nuclear fuel purchases																	9,461		6,628		5,846
Property, plant and equipment	64,917								57,552								64,917		57,552		54,221
Accumulated depreciation and amortization	15,504								15,062								15,504		15,062		15,146
Total assets	64,439								57,188								64,439		57,188		52,994
Investments in equity method investees	$ 262								$ 202								$ 262		$ 202		$ 227

[1] The sum of the quarterly amounts may not equal the total for the year due to rounding.

[2] 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.

[3] (b)Prior year amounts are restated to conform to the current year's presentation. See Note 1 - Basis of Presentation and Note 1 - Sale of Differential Membership Interests.

[4] Interest expense allocated from NEECH is based on a deemed capital structure of 70% debt. For this purpose, the deferred credit associated with differential membership interests sold by NEER subsidiaries is included with debt. Residual non-utility interest expense is included in Corporate and Other.

[5] Prior year amounts are restated to conform to the current year's presentation. See Note 1 - Basis of Presentation and Note 1 - Sale of Differential Membership Interests.

[6] In 2011, NEER includes impairment charges of approximately $51 million ($31 million after-tax). See Note 4 - Nonrecurring Fair Value Measurements.

[7] NEER includes PTCs that were recognized based on its tax sharing agreement with NEE. See Note 1 - Income Taxes.

[8] In 2011, NEER and Corporate and Other include an after-tax loss on sale of natural gas-fired generating assets of $92 million and $6 million, respectively. See Note 4 - Nonrecurring Fair Value Measurements.

[9] In 2012, NEER includes assets held for sale of approximately $335 million. See Note 1 - Assets and Liabilities Associated with Assets Held for Sale.

[10] In 2011, Corporate and Other includes state deferred income tax benefits of approximately $64 million, net of federal income taxes, related to state tax law changes and an income tax benefit of $41 million related to the dissolution of a subsidiary.