Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2010		Sep. 30, 2010		Jun. 30, 2010		Mar. 31, 2010		Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balances							$ 14,461								$ 12,967		$ 14,461		$ 12,967		$ 11,681
Net income of NEE	667	[1],[2]	407	[1],[2]	580	[1],[2]	268	[1],[2]	263	[1],[2]	720	[1],[2]	417	[1],[2]	556	[1],[2]	1,923		1,957		1,615
Net unrealized gains (losses) on cash flow hedges:
Effective portion of net unrealized gains (losses)																	(265)		(5)		137
Reclassification from AOCI to net income																	37		(38)		(75)	[3]
Net unrealized gains (losses) on available for sale securities:
Net unrealized gains (losses) on securities still held																	19		60		119
Reclassification from AOCI to net income																	(49)		(21)		(27)
Adjustments between AOCI and retained earnings																					0
Defined benefit pension and other benefits plans																	(45)		2		22
Net unrealized gains (losses) on foreign currency translation																	(5)		(1)		11
Other comprehensive loss related to equity method investee																	(12)
Ending Balances	14,943								14,461								14,943		14,461		12,967
Comprehensive income																	1,603		1,954		1,802
Other comprehensive income, tax [Abstract]
Tax expense (benefit) of unrealized gains/losses on cash flow hedges																	(135)		(3)		90
Tax expense (benefit) on cash flow hedges reclassified from AOCI to net income																	18		(35)		(50)	[3]
Tax expense (benefit) of unrealized gains/losses on available for sale securities still held																	13		41		77
Tax expense (benefit) on available for sale securities reclassified from AOCI to net income																	(34)		(16)		(17)
Tax expense (benefit) of defined benefit pension and other benefits plans																	(32)		1		14
Tax expense (benefit) of foreign currency translation																	(3)				5
Tax expense (benefit) related to equity method investee																	(8)
Amounts reclassified into earnings due to discontinuance of cash flow hedges																					3
Tax expense (benefit) of amounts reclassified into earnings due to discontinuance of cash flow hedges																					(2)
Total gain (loss) on cash flow hedges expected to be reclassified into earnings within the next 12 months																	(13)
Net Unrealized Gains (Losses) On Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balances							24								67		24		67		5
Net unrealized gains (losses) on cash flow hedges:
Effective portion of net unrealized gains (losses)																	(265)		(5)		137
Reclassification from AOCI to net income																	37		(38)		(75)	[3]
Net unrealized gains (losses) on available for sale securities:
Net unrealized gains (losses) on securities still held																	0		0		0
Reclassification from AOCI to net income																	0		0		0
Adjustments between AOCI and retained earnings																					0
Defined benefit pension and other benefits plans																	0		0		0
Net unrealized gains (losses) on foreign currency translation																	0		0		0
Other comprehensive loss related to equity method investee																	0
Ending Balances	(204)	[4]							24								(204)	[4]	24		67
Other [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balances							142								102		142		102		(18)
Net unrealized gains (losses) on cash flow hedges:
Effective portion of net unrealized gains (losses)																	0		0		0
Reclassification from AOCI to net income																	0		0		0	[3]
Net unrealized gains (losses) on available for sale securities:
Net unrealized gains (losses) on securities still held																	19		60		119
Reclassification from AOCI to net income																	(49)		(21)		(27)
Adjustments between AOCI and retained earnings																					(5)
Defined benefit pension and other benefits plans																	(45)		2		22
Net unrealized gains (losses) on foreign currency translation																	(5)		(1)		11
Other comprehensive loss related to equity method investee																	(12)
Ending Balances	50								142								50		142		102
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balances							166	[5]							169	[5]	166	[5]	169	[5]	(13)	[5]
Net unrealized gains (losses) on cash flow hedges:
Effective portion of net unrealized gains (losses)																	(265)		(5)		137
Reclassification from AOCI to net income																	37		(38)		(75)	[3]
Net unrealized gains (losses) on available for sale securities:
Net unrealized gains (losses) on securities still held																	19		60		119
Reclassification from AOCI to net income																	(49)		(21)		(27)
Adjustments between AOCI and retained earnings																					(5)
Defined benefit pension and other benefits plans																	(45)	[5]	2	[5]	22	[5]
Net unrealized gains (losses) on foreign currency translation																	(5)		(1)		11
Other comprehensive loss related to equity method investee																	(12)
Ending Balances	$ (154)	[5]							$ 166	[5]							$ (154)	[5]	$ 166	[5]	$ 169	[5]

[1] 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.

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

[3] Includes amounts reclassified into earnings due to discontinuance of cash flow hedges of approximately $3 million (net of $2 million tax benefit) for which the hedged transactions are no longer probable of occurring.

[4] Approximately $13 million of losses, related to derivative instruments, is expected to be reclassified into earnings within the next 12 months as either the principal and/or interest payments are made or electricity is sold. Such amount assumes no change in power prices, interest rates or scheduled principal payments.

[5] Comprehensive income, which includes net income and other comprehensive income (loss), totaled approximately $1,603 million, $1,954 million and $1,802 million for 2011, 2010 and 2009, respectively.