Fair Value Measurements (Details) (Fair value measurements made on a recurring basis [Member], USD $) In Millions, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Cash equivalents:
Equity securities	$ 80		$ 159
Special use funds:
Equity securities	2,021		1,915
U.S. Government and municipal bonds	669		675
Corporate debt securities	503		516
Mortgage-backed securities	598		511
Other debt securities	34		47
Other investments:
Equity securities	14		4
U.S. Government and municipal bonds	8		8
Corporate debt securities	46		43
Mortgage-backed securities	51		33
Other	9		10
Derivatives:
Commodity contracts	1,716	[1]	1,520	[1]
Interest rate swaps	68	[1]	37	[1]
Foreign currency swaps	6	[1]	27	[1]
Derivatives:
Commodity contracts	1,149	[1]	1,302	[1]
Interest rate swaps	349	[1]	320	[1]
Foreign currency swaps	17	[1]	9	[1]
Fair value of investments in commingled funds whose underlying investments would be Level 1 if those investments were held directly by the registrant	1,150		1,086
FPL [Member]
Cash equivalents:
Equity securities			11
Special use funds:
Equity securities	1,244		1,184
U.S. Government and municipal bonds	576		592
Corporate debt securities	346		359
Mortgage-backed securities	516		434
Other debt securities	20		32
Derivatives:
Commodity contracts	25	[1]	12	[1]
Derivatives:
Commodity contracts	327	[1]	513	[1]
Fair value of investments in commingled funds whose underlying investments would be Level 1 if those investments were held directly by the registrant	1,033		979
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member]
Cash equivalents:
Equity securities	80		159
Special use funds:
Equity securities	766		709
U.S. Government and municipal bonds	477		508
Corporate debt securities	0		0
Mortgage-backed securities	0		0
Other debt securities	0		0
Other investments:
Equity securities	14		4
U.S. Government and municipal bonds	8		8
Corporate debt securities	0		0
Mortgage-backed securities	0		0
Other	5		5
Derivatives:
Commodity contracts	2,144		2,448
Interest rate swaps	0		0
Foreign currency swaps	0		0
Derivatives:
Commodity contracts	2,226		2,588
Interest rate swaps	0		0
Foreign currency swaps	0		0
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | FPL [Member]
Cash equivalents:
Equity securities			11
Special use funds:
Equity securities	142		128
U.S. Government and municipal bonds	424		458
Corporate debt securities	0		0
Mortgage-backed securities	0		0
Other debt securities	0		0
Derivatives:
Commodity contracts	0		0
Derivatives:
Commodity contracts	0		0
Significant Other Observable Inputs (Level 2) [Member]
Cash equivalents:
Equity securities	0		0
Special use funds:
Equity securities	1,255	[2]	1,206	[3]
U.S. Government and municipal bonds	192		167
Corporate debt securities	503		516
Mortgage-backed securities	598		511
Other debt securities	34		47
Other investments:
Equity securities	0		0
U.S. Government and municipal bonds	0		0
Corporate debt securities	46		43
Mortgage-backed securities	51		33
Other	4		5
Derivatives:
Commodity contracts	3,838		3,478
Interest rate swaps	68		37
Foreign currency swaps	6		27
Derivatives:
Commodity contracts	3,617		3,582
Interest rate swaps	349		320
Foreign currency swaps	17		9
Significant Other Observable Inputs (Level 2) [Member] | FPL [Member]
Cash equivalents:
Equity securities			0
Special use funds:
Equity securities	1,102	[2]	1,056	[2]
U.S. Government and municipal bonds	152		134
Corporate debt securities	346		359
Mortgage-backed securities	516		434
Other debt securities	20		32
Derivatives:
Commodity contracts	22		8
Derivatives:
Commodity contracts	331		513
Significant Unobservable Inputs (Level 3) [Member]
Cash equivalents:
Equity securities	0		0
Special use funds:
Equity securities	0		0
U.S. Government and municipal bonds	0		0
Corporate debt securities	0		0
Mortgage-backed securities	0		0
Other debt securities	0		0
Other investments:
Equity securities	0		0
U.S. Government and municipal bonds	0		0
Corporate debt securities	0		0
Mortgage-backed securities	0		0
Other	0		0
Derivatives:
Commodity contracts	1,186		1,071
Interest rate swaps	0		0
Foreign currency swaps	0		0
Derivatives:
Commodity contracts	611		585
Interest rate swaps	0		0
Foreign currency swaps	0		0
Significant Unobservable Inputs (Level 3) [Member] | FPL [Member]
Cash equivalents:
Equity securities			0
Special use funds:
Equity securities	0		0
U.S. Government and municipal bonds	0		0
Corporate debt securities	0		0
Mortgage-backed securities	0		0
Other debt securities	0		0
Derivatives:
Commodity contracts	10		6
Derivatives:
Commodity contracts	3		2
Netting [Member]
Cash equivalents:
Equity securities	0	[4]	0	[4]
Special use funds:
Equity securities	0	[4]	0	[4]
U.S. Government and municipal bonds	0	[4]	0	[4]
Corporate debt securities	0	[4]	0	[4]
Mortgage-backed securities	0	[4]	0	[4]
Other debt securities	0	[4]	0	[4]
Other investments:
Equity securities	0	[4]	0	[4]
U.S. Government and municipal bonds	0	[4]	0	[4]
Corporate debt securities	0	[4]	0	[4]
Mortgage-backed securities	0	[4]	0	[4]
Other	0	[4]	0	[4]
Derivatives:
Commodity contracts	(5,452)	[4]	(5,477)	[4]
Interest rate swaps	0	[4]	0	[4]
Foreign currency swaps	0	[4]	0	[4]
Derivatives:
Commodity contracts	(5,305)	[4]	(5,453)	[4]
Interest rate swaps	0	[4]	0	[4]
Foreign currency swaps	0	[4]	0	[4]
Netting [Member] | FPL [Member]
Cash equivalents:
Equity securities			0	[4]
Special use funds:
Equity securities	0	[4]	0	[4]
U.S. Government and municipal bonds	0	[4]	0	[4]
Corporate debt securities	0	[4]	0	[4]
Mortgage-backed securities	0	[4]	0	[4]
Other debt securities	0	[4]	0	[4]
Derivatives:
Commodity contracts	(7)	[4]	(2)	[4]
Derivatives:
Commodity contracts	$ (7)	[4]	$ (2)	[4]

[1] See Note 2 for a reconciliation of net derivatives to NEE's and FPL's condensed consolidated balance sheets.

[2] At NEE, approximately $1,150 million ($1,033 million at FPL) are invested in commingled funds whose underlying investments would be Level 1 if those investments were held directly by NEE or FPL.

[3] At NEE, approximately $1,086 million ($979 million at FPL) are invested in commingled funds whose underlying investments would be Level 1 if those investments were held directly by NEE or FPL.

[4] Includes the effect of the contractual ability to settle contracts under master netting arrangements and margin cash collateral payments and receipts.