Derivative Instruments, Gains (Losses) Recorded in Condensed Consolidated Financial Statements (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on commodity contracts, recorded as regulatory assets and or liabilities on the balance sheet due to regulatory treatment	$ (232)		$ (306)		$ (300)		$ (698)
Derivatives designated as cash flow hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in OCI	(250)		(71)		(373)		(153)
Gains (losses) reclassified from AOCI to net income	(5)		10		(33)		57
Gains (losses) recognized in income					0	[1]	1	[1]
Derivatives designated as cash flow hedges [Member] | Interest rate swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in OCI	(236)		(76)		(353)		(181)
Gains (losses) reclassified from AOCI to net income	(21)	[2]	(23)	[2]	(64)	[2]	(50)	[2]
Gains (losses) recognized in income					0	[1]	0	[1]
Derivatives designated as cash flow hedges [Member] | Foreign currency swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in OCI	(14)		5		(20)		9
Gains (losses) reclassified from AOCI to net income	5	[3]	8	[3]	1	[4]	14	[5]
Gains (losses) recognized in income					0	[1]	0	[1]
Derivatives designated as cash flow hedges [Member] | Foreign currency swaps [Member] | Gains (losses) included in interest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from AOCI to net income	(1)				(4)		(2)
Derivatives designated as cash flow hedges [Member] | Commodity contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in OCI	0		0		0		19
Gains (losses) reclassified from AOCI to net income	11	[6]	25	[6]	30	[6]	93	[6]
Gains (losses) recognized in income					0	[1]	1	[1]
Interest rate contracts [Member] | Derivatives not designated as hedging instruments [Member] | Gains (losses) included in Other - net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	(16)		0		(11)		0
Foreign currency swaps [Member] | Derivatives not designated as hedging instruments [Member] | Gains (losses) included in Other - net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	23		8		20		13
Commodity contracts [Member] | Derivatives not designated as hedging instruments [Member] | Gains (losses) included in operating revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	(50)	[7]	354	[7]	(48)	[7]	615	[7]
Commodity contracts [Member] | Derivatives not designated as hedging instruments [Member] | Gains (losses) included in fuel, purchased power and interchange [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	10		(104)		8		(10)
Derivatives not designated as hedging instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	(33)		258		(31)		618
Derivatives designated as fair value hedges [Member] | Gains (losses) included in interest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	16		4		19		8
Number of instruments held	6		3		6		3
Foreign currency swaps [Member] | Gains (losses) included in interest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from AOCI to net income			$ (1)

[1] Represents the ineffective portion of the hedging instrument.

[2] Included in interest expense.

[3] Loss of approximately $1 million is included in interest expense and the balance is included in other - net.

[4] Loss of approximately $4 million is included in interest expense and the balance is included in other - net.

[5] Loss of approximately $2 million is included in interest expense and the balance is included in other - net.

[6] Included in operating revenues.

[7] In addition, for the three and nine months ended September 30, 2011, FPL recorded approximately $232 million and $300 million of losses, respectively, related to commodity contracts as regulatory assets on its condensed consolidated balance sheets. For the three and nine months ended September 30, 2010, FPL recorded approximately $306 million and $698 million of losses, respectively, related to commodity contracts as regulatory assets on its condensed consolidated balance sheets.