Summarized Financial Information of Capital Holdings (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
FPL Group Capital ownership percentage	100.00%
Condensed Consolidating Statements of Income
Operating revenues	$ 3,371	$ 3,134
Operating expenses	(2,528)	(2,706)
Interest expense	(265)	(254)
Equity in earnings of subsidiaries	0	0
Other income (deductions) - net	40	62
Income (loss) before income taxes	618	236
Income tax expense (benefit)	157	(32)
Net income (loss)	461	268
Comprehensive income of NextEra Energy	521	304
PROPERTY, PLANT AND EQUIPMENT
Electric utility plant in service and other property	59,261		57,552
Less accumulated depreciation and amortization	(15,293)		(15,062)
Total property, plant and equipment - net	43,968		42,490
CURRENT ASSETS
Cash and cash equivalents	275	425
Receivables	1,837		1,802
Other	2,982		2,693
Total current assets	5,094		4,872
OTHER ASSETS
Investment in subsidiaries	0		0
Other	10,145		9,826
Total other assets	10,145		9,826
TOTAL ASSETS	59,207		57,188
CAPITALIZATION
Common shareholders' equity	15,223		14,943
Long-term debt	20,582		20,810
Total capitalization	35,805		35,753
CURRENT LIABILITIES
Debt due within one year	3,388		2,157
Accounts payable	1,073		1,191
Other	3,544		3,371
Total current liabilities	8,005		6,719
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	1,634		1,611
Accumulated deferred income taxes	5,813		5,681
Other	7,950		7,424
Total other liabilities and deferred credits	15,397		14,716
Commitments and Contingencies
TOTAL CAPITALIZATION AND LIABILITIES	59,207		57,188
Condensed Consolidating Statements of Cash Flows
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries	0	0
Proceeds from Dividends Received	0	0
Other Operating Activities, Not Otherwise Separately Disclosed	835	983
NET CASH PROVIDED BY OPERATING ACTIVITIES	835	983
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures, independent power and other investments and nuclear fuel purchases	(2,014)	(1,444)
Capital contribution to FPL	0	0
Cash grants under the Recovery Act	0	377
Other - net	19	(10)
Net cash used in investing activities	(1,995)	(1,077)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuances of long-term debt	566	201
Retirements of long-term debt	(134)	(252)
Proceeds from sale of differential membership interests	303	0
Net change in short-term debt	582	488
Dividends on common stock	(248)	(229)
Cash Dividends Paid to Parent Company	0	0
Other - net	(4)	(9)
Other Financing Activities, Not Otherwise Separately Disclosed	(11)	9
Net cash provided by (used in) financing activities	1,058	217
Net increase (decrease) in cash and cash equivalents	(102)	123
Cash and cash equivalents at beginning of period	377	302	302
Cash and cash equivalents at end of period	275	425
NextEra Energy (Guarantor) [Member]
Condensed Consolidating Statements of Income
Operating revenues	0	0
Operating expenses	(4)	(3)
Interest expense	(3)	(3)
Equity in earnings of subsidiaries	458	0
Other income (deductions) - net	0	270
Income (loss) before income taxes	451	264
Income tax expense (benefit)	(10)	(4)
Net income (loss)	461	268
Comprehensive income of NextEra Energy	521	304
PROPERTY, PLANT AND EQUIPMENT
Electric utility plant in service and other property	30		31
Less accumulated depreciation and amortization	(4)		(3)
Total property, plant and equipment - net	26		28
CURRENT ASSETS
Cash and cash equivalents	1	0	1
Receivables	156		84
Other	9		5
Total current assets	166		90
OTHER ASSETS
Investment in subsidiaries	15,154		14,879
Other	854		513
Total other assets	16,008		15,392
TOTAL ASSETS	16,200		15,510
CAPITALIZATION
Common shareholders' equity	15,223		14,943
Long-term debt	0		0
Total capitalization	15,223		14,943
CURRENT LIABILITIES
Debt due within one year	0		0
Accounts payable	0		0
Other	401		250
Total current liabilities	401		250
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	0		0
Accumulated deferred income taxes	73		68
Other	503		249
Total other liabilities and deferred credits	576		317
Commitments and Contingencies
TOTAL CAPITALIZATION AND LIABILITIES	16,200		15,510
Condensed Consolidating Statements of Cash Flows
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries	0		400
Proceeds from Dividends Received	295	0
Other Operating Activities, Not Otherwise Separately Disclosed	12	118
NET CASH PROVIDED BY OPERATING ACTIVITIES	307	518
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures, independent power and other investments and nuclear fuel purchases	0	(16)
Capital contribution to FPL	(40)	0
Cash grants under the Recovery Act	0	0
Other - net	0	(280)
Net cash used in investing activities	(40)	(296)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuances of long-term debt	0	0
Retirements of long-term debt	0	0
Proceeds from sale of differential membership interests	0	0
Net change in short-term debt	0	0
Dividends on common stock	(248)	(229)
Cash Dividends Paid to Parent Company	0	0
Other - net	(19)	7
Net cash provided by (used in) financing activities	(267)	(222)
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	1	0	0
Cash and cash equivalents at end of period	1	0	1
Capital Holdings Consolidated [Member]
Condensed Consolidating Statements of Income
Operating revenues	1,151	890
Operating expenses	(784)	(865)
Interest expense	(161)	(163)
Equity in earnings of subsidiaries	0	0
Other income (deductions) - net	32	53
Income (loss) before income taxes	238	(85)
Income tax expense (benefit)	19	(149)
Net income (loss)	219	64
Comprehensive income of NextEra Energy	291	94
PROPERTY, PLANT AND EQUIPMENT
Electric utility plant in service and other property	23,089		22,351
Less accumulated depreciation and amortization	(4,364)		(4,143)
Total property, plant and equipment - net	18,725		18,208
CURRENT ASSETS
Cash and cash equivalents	257	404
Receivables	1,144		1,026
Other	1,323		1,075
Total current assets	2,724		2,440
OTHER ASSETS
Investment in subsidiaries	0		0
Other	5,017		4,849
Total other assets	5,017		4,849
TOTAL ASSETS	26,466		25,497
CAPITALIZATION
Common shareholders' equity	4,025		4,030
Long-term debt	13,526		13,327
Total capitalization	17,551		17,357
CURRENT LIABILITIES
Debt due within one year	2,100		1,778
Accounts payable	428		512
Other	1,641		1,520
Total current liabilities	4,169		3,810
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	475		466
Accumulated deferred income taxes	1,355		1,376
Other	2,916		2,488
Total other liabilities and deferred credits	4,746		4,330
Commitments and Contingencies
TOTAL CAPITALIZATION AND LIABILITIES	26,466		25,497
Condensed Consolidating Statements of Cash Flows
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries	0	0
Proceeds from Dividends Received	0	0
Other Operating Activities, Not Otherwise Separately Disclosed	265	234
NET CASH PROVIDED BY OPERATING ACTIVITIES	265	234
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures, independent power and other investments and nuclear fuel purchases	(902)	(734)
Capital contribution to FPL	0	0
Cash grants under the Recovery Act	0	223
Other - net	29	8
Net cash used in investing activities	(873)	(503)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuances of long-term debt	566	201
Retirements of long-term debt	(109)	(228)
Proceeds from sale of differential membership interests	303	0
Net change in short-term debt	75	158
Dividends on common stock	0	0
Cash Dividends Paid to Parent Company	(295)	0
Other - net	(14)	260
Net cash provided by (used in) financing activities	526	391
Net increase (decrease) in cash and cash equivalents	(82)	122
Cash and cash equivalents at beginning of period	339	282	282
Cash and cash equivalents at end of period	257	404
Other Consolidated Entity And Consolidation Eliminations [Member]
Condensed Consolidating Statements of Income
Operating revenues	2,220	2,244
Operating expenses	(1,740)	(1,838)
Interest expense	(101)	(88)
Equity in earnings of subsidiaries	(458)	0
Other income (deductions) - net	8	(261)
Income (loss) before income taxes	(71)	57
Income tax expense (benefit)	148	121
Net income (loss)	(219)	(64)
Comprehensive income of NextEra Energy	(291)	(94)
PROPERTY, PLANT AND EQUIPMENT
Electric utility plant in service and other property	36,142		35,170
Less accumulated depreciation and amortization	(10,925)		(10,916)
Total property, plant and equipment - net	25,217		24,254
CURRENT ASSETS
Cash and cash equivalents	17	21
Receivables	537		692
Other	1,650		1,613
Total current assets	2,204		2,342
OTHER ASSETS
Investment in subsidiaries	(15,154)		(14,879)
Other	4,274		4,464
Total other assets	(10,880)		(10,415)
TOTAL ASSETS	16,541		16,181
CAPITALIZATION
Common shareholders' equity	(4,025)		(4,030)
Long-term debt	7,056		7,483
Total capitalization	3,031		3,453
CURRENT LIABILITIES
Debt due within one year	1,288		379
Accounts payable	645		679
Other	1,502		1,601
Total current liabilities	3,435		2,659
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	1,159		1,145
Accumulated deferred income taxes	4,385		4,237
Other	4,531		4,687
Total other liabilities and deferred credits	10,075		10,069
Commitments and Contingencies
TOTAL CAPITALIZATION AND LIABILITIES	16,541		16,181
Condensed Consolidating Statements of Cash Flows
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries	0	(400)
Proceeds from Dividends Received	(295)	0
Other Operating Activities, Not Otherwise Separately Disclosed	558	631
NET CASH PROVIDED BY OPERATING ACTIVITIES	263	231
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures, independent power and other investments and nuclear fuel purchases	(1,112)	(694)
Capital contribution to FPL	40	0
Cash grants under the Recovery Act	0	154
Other - net	(10)	262
Net cash used in investing activities	(1,082)	(278)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuances of long-term debt	0	0
Retirements of long-term debt	(25)	(24)
Proceeds from sale of differential membership interests	0	0
Net change in short-term debt	507	330
Dividends on common stock	0	0
Cash Dividends Paid to Parent Company	295	0
Other - net	22	(258)
Net cash provided by (used in) financing activities	799	48
Net increase (decrease) in cash and cash equivalents	(20)	1
Cash and cash equivalents at beginning of period	37	20	20
Cash and cash equivalents at end of period	$ 17	$ 21