Summarized Financial Information of Capital Holdings (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Dec. 31, 2012		Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]
NEECH a 100% owned subsidiary of NEE	100.00%
Condensed Consolidating Statements of Income
Operating revenues	$ 3,279		$ 3,371
Operating expenses	(2,845)		(2,568)	[1]
Interest expense	(272)		(265)
Equity in earnings of subsidiaries	0		0
Other income (deductions) - net	90		80	[1]
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	252		618
Income tax expense (benefit)	168		157
Income from continuing operations	84		461
NET GAIN FROM DISCONTINUED OPERATIONS, NET OF INCOME TAXES	188		0
Net income (loss)	272		461
COMPREHENSIVE INCOME	391		521
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	65,490				64,917
Less accumulated depreciation and amortization	(15,666)				(15,504)
Total property, plant and equipment - net	49,824				49,413
CURRENT ASSETS
Cash and cash equivalents	215		275				377
Receivables	1,759				2,056
Other	2,071				2,852
Total current assets	4,045				5,237
OTHER ASSETS
Investment in subsidiaries	0				0
Other	9,974				9,789
Total other assets	9,974				9,789
TOTAL ASSETS	63,843				64,439
CAPITALIZATION
Common shareholders' equity	16,202				16,068
Long-term debt	22,866				23,177
Total capitalization	39,068				39,245
CURRENT LIABILITIES
Debt due within one year	5,058				4,182
Accounts payable	1,094				1,281
Other	2,624				3,416
Total current liabilities	8,776				8,879
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	1,739				1,715
Deferred income taxes	6,660				6,703
Other	7,600				7,897
Total other liabilities and deferred credits	15,999				16,315
Commitments and Contingencies
TOTAL CAPITALIZATION AND LIABILITIES	63,843				64,439
Condensed Consolidating Statements of Cash Flows
NET CASH PROVIDED BY OPERATING ACTIVITIES	1,082		835
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures, independent power and other investments and nuclear fuel purchases	(1,867)		(2,014)
Capital contribution to FPL	0		0
Cash grants under the Recovery Act	170		0
Change in loan proceeds restricted for construction	112		45
Other - net	7		(26)
Net cash used in investing activities	(1,578)		(1,995)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuances of long-term debt	623		566
Retirements of long-term debt	(923)		(134)
Proceeds from sale of differential membership interests	0		303
Net change in short-term debt	966		582
Dividends on common stock	(279)		(248)
Other - net	7		(4)
Other Financing Activities, Not Otherwise Separately Disclosed	(5)		(11)
Net cash provided by (used in) financing activities	382		1,058
Net increase (decrease) in cash and cash equivalents	(114)		(102)
Cash and cash equivalents at beginning of period	329		377				377
Cash and cash equivalents at end of period	215		275				377
NextEra Energy (Guarantor) [Member]
Condensed Consolidating Statements of Income
Operating revenues	0		0
Operating expenses	(3)		(4)	[1]
Interest expense	(2)		(3)
Equity in earnings of subsidiaries	249		458
Other income (deductions) - net	0		0	[1]
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	244		451
Income tax expense (benefit)	(15)		(10)
Income from continuing operations	259		461
NET GAIN FROM DISCONTINUED OPERATIONS, NET OF INCOME TAXES	13		0
Net income (loss)	272		461
COMPREHENSIVE INCOME	391		521
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	32				31
Less accumulated depreciation and amortization	(8)				(7)
Total property, plant and equipment - net	24				24
CURRENT ASSETS
Cash and cash equivalents	0		1				1
Receivables	507				398
Other	9				432
Total current assets	516				832
OTHER ASSETS
Investment in subsidiaries	16,138				16,064
Other	758				647
Total other assets	16,896				16,711
TOTAL ASSETS	17,436				17,567
CAPITALIZATION
Common shareholders' equity	16,202				16,068
Long-term debt	0				0
Total capitalization	16,202				16,068
CURRENT LIABILITIES
Debt due within one year	0				0
Accounts payable	0				1
Other	614				440
Total current liabilities	614				441
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	0				0
Deferred income taxes	70				497
Other	550				561
Total other liabilities and deferred credits	620				1,058
Commitments and Contingencies
TOTAL CAPITALIZATION AND LIABILITIES	17,436				17,567
Condensed Consolidating Statements of Cash Flows
NET CASH PROVIDED BY OPERATING ACTIVITIES	350		307
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures, independent power and other investments and nuclear fuel purchases	0		0
Capital contribution to FPL	0		(40)
Cash grants under the Recovery Act	0		0
Change in loan proceeds restricted for construction	0		0
Other - net	(52)		0
Net cash used in investing activities	(52)		(40)
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	(279)		(248)
Other - net	(21)		(19)
Net cash provided by (used in) financing activities	(300)		(267)
Net increase (decrease) in cash and cash equivalents	(2)		0
Cash and cash equivalents at beginning of period	2						1
Cash and cash equivalents at end of period	0		1				1
Capital Holdings Consolidated [Member]
Condensed Consolidating Statements of Income
Operating revenues	1,094		1,151
Operating expenses	(1,200)		(825)	[1]
Interest expense	(170)		(161)
Equity in earnings of subsidiaries	0		0
Other income (deductions) - net	73		73	[1]
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(203)		238
Income tax expense (benefit)	11		19
Income from continuing operations	(214)		219
NET GAIN FROM DISCONTINUED OPERATIONS, NET OF INCOME TAXES	175		0
Net income (loss)	(39)		219
COMPREHENSIVE INCOME	73		291
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	27,030				26,638
Less accumulated depreciation and amortization	(5,060)				(4,800)
Total property, plant and equipment - net	21,970				21,838
CURRENT ASSETS
Cash and cash equivalents	179		257				339
Receivables	1,047				1,208
Other	903				1,421
Total current assets	2,129				2,916
OTHER ASSETS
Investment in subsidiaries	0				0
Other	4,718				4,749
Total other assets	4,718				4,749
TOTAL ASSETS	28,817				29,503
CAPITALIZATION
Common shareholders' equity	3,660				3,533
Long-term debt	14,565				14,848
Total capitalization	18,225				18,381
CURRENT LIABILITIES
Debt due within one year	4,099				3,624
Accounts payable	475				667
Other	1,614				2,317
Total current liabilities	6,188				6,608
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	517				508
Deferred income taxes	1,040				891
Other	2,847				3,115
Total other liabilities and deferred credits	4,404				4,514
Commitments and Contingencies
TOTAL CAPITALIZATION AND LIABILITIES	28,817				29,503
Condensed Consolidating Statements of Cash Flows
NET CASH PROVIDED BY OPERATING ACTIVITIES	295		265
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures, independent power and other investments and nuclear fuel purchases	(1,046)		(902)
Capital contribution to FPL	0		0
Cash grants under the Recovery Act	170		0
Change in loan proceeds restricted for construction	112		45
Other - net	29		(16)
Net cash used in investing activities	(735)		(873)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuances of long-term debt	623		566
Retirements of long-term debt	(496)		(109)
Proceeds from sale of differential membership interests	0		303
Net change in short-term debt	166		75
Dividends on common stock	0		0
Other - net	39		(309)
Net cash provided by (used in) financing activities	332		526
Net increase (decrease) in cash and cash equivalents	(108)		(82)
Cash and cash equivalents at beginning of period	287						339
Cash and cash equivalents at end of period	179		257				339
Other Consolidated Entity And Consolidation Eliminations [Member]
Condensed Consolidating Statements of Income
Operating revenues	2,185	[2]	2,220	[2]
Operating expenses	(1,642)	[2]	(1,739)	[1],[2]
Interest expense	(100)	[2]	(101)	[2]
Equity in earnings of subsidiaries	(249)	[2]	(458)	[2]
Other income (deductions) - net	17	[2]	7	[1],[2]
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	211	[2]	(71)	[2]
Income tax expense (benefit)	172	[2]	148	[2]
Income from continuing operations	39	[2]	(219)	[2]
NET GAIN FROM DISCONTINUED OPERATIONS, NET OF INCOME TAXES	0	[2]	0	[2]
Net income (loss)	39	[2]	(219)	[2]
COMPREHENSIVE INCOME	(73)	[2]	(291)	[2]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	38,428	[2]			38,248	[2]
Less accumulated depreciation and amortization	(10,598)	[2]			(10,697)	[2]
Total property, plant and equipment - net	27,830	[2]			27,551	[2]
CURRENT ASSETS
Cash and cash equivalents	36	[2]	17	[2]			37	[2]
Receivables	205	[2]			450	[2]
Other	1,159	[2]			999	[2]
Total current assets	1,400	[2]			1,489	[2]
OTHER ASSETS
Investment in subsidiaries	(16,138)	[2]			(16,064)	[2]
Other	4,498	[2]			4,393	[2]
Total other assets	(11,640)	[2]			(11,671)	[2]
TOTAL ASSETS	17,590	[2]			17,369	[2]
CAPITALIZATION
Common shareholders' equity	(3,660)	[2]			(3,533)	[2]
Long-term debt	8,301	[2]			8,329	[2]
Total capitalization	4,641	[2]			4,796	[2]
CURRENT LIABILITIES
Debt due within one year	959	[2]			558	[2]
Accounts payable	619	[2]			613	[2]
Other	396	[2]			659	[2]
Total current liabilities	1,974	[2]			1,830	[2]
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	1,222	[2]			1,207	[2]
Deferred income taxes	5,550	[2]			5,315	[2]
Other	4,203	[2]			4,221	[2]
Total other liabilities and deferred credits	10,975	[2]			10,743	[2]
Commitments and Contingencies		[2]				[2]
TOTAL CAPITALIZATION AND LIABILITIES	17,590	[2]			17,369	[2]
Condensed Consolidating Statements of Cash Flows
NET CASH PROVIDED BY OPERATING ACTIVITIES	437	[2]	263	[2]
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures, independent power and other investments and nuclear fuel purchases	(821)	[2]	(1,112)	[2]
Capital contribution to FPL	0	[2]	40	[2]
Cash grants under the Recovery Act	0	[2]	0	[2]
Change in loan proceeds restricted for construction	0	[2]	0	[2]
Other - net	30	[2]	(10)	[2]
Net cash used in investing activities	(791)	[2]	(1,082)	[2]
CASH FLOWS FROM FINANCING ACTIVITIES
Issuances of long-term debt	0	[2]	0	[2]
Retirements of long-term debt	(427)	[2]	(25)	[2]
Proceeds from sale of differential membership interests	0	[2]	0	[2]
Net change in short-term debt	800	[2]	507	[2]
Dividends on common stock	0	[2]	0	[2]
Other - net	(23)	[2]	317	[2]
Net cash provided by (used in) financing activities	350	[2]	799	[2]
Net increase (decrease) in cash and cash equivalents	(4)	[2]	(20)	[2]
Cash and cash equivalents at beginning of period	40	[2]					37	[2]
Cash and cash equivalents at end of period	$ 36	[2]	$ 17	[2]			$ 37	[2]

[1] Prior year amounts are restated to conform to the current year's presentation.

[2] Represents FPL and consolidating adjustments.