Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) (Fair value measurements made on a recurring basis [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Cash equivalents:
Equity securities	$ 13		$ 20
Special use funds:
Equity securities	2,675	[1]	2,506	[1]
U.S. Government and municipal bonds	734	[1]	827	[1]
Corporate debt securities	677	[1]	597	[1]
Mortgage-backed securities	497	[1]	479	[1]
Other debt securities	61	[1]	60	[1]
Other investments:
Equity Securities	110		51
Debt securities	180		118
Derivatives:
Commodity contracts	1,339	[2]	1,571	[2]
Interest rate contracts	65	[2]	90	[2]
Derivatives:
Commodity contracts	995	[2]	940	[2]
Interest rate swaps	256	[2]	220	[2]
Foreign currency swaps	74	[2]	151	[2]
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member]
Cash equivalents:
Equity securities	13		20
Special use funds:
Equity securities	1,196	[1]	1,170	[1]
U.S. Government and municipal bonds	573	[1]	647	[1]
Corporate debt securities	0	[1]	0	[1]
Mortgage-backed securities	0	[1]	0	[1]
Other debt securities	25	[1]	16	[1]
Other investments:
Equity Securities	39		51
Debt securities	16		11
Derivatives:
Commodity contracts	1,877		1,368
Interest rate contracts	0		0
Derivatives:
Commodity contracts	1,825		1,285
Interest rate swaps	0		0
Foreign currency swaps	0		0
Significant Other Observable Inputs (Level 2) [Member]
Cash equivalents:
Equity securities	0		0
Special use funds:
Equity securities	1,350	[1],[3]	1,336	[1],[3]
U.S. Government and municipal bonds	161	[1]	180	[1]
Corporate debt securities	677	[1]	597	[1]
Mortgage-backed securities	497	[1]	479	[1]
Other debt securities	36	[1]	44	[1]
Other investments:
Equity Securities	0		0
Debt securities	164		107
Derivatives:
Commodity contracts	2,607		2,106
Interest rate contracts	28		90
Derivatives:
Commodity contracts	2,535		1,994
Interest rate swaps	91		127
Foreign currency swaps	74		151
Significant Unobservable Inputs (Level 3) [Member]
Cash equivalents:
Equity securities	0		0
Special use funds:
Equity securities	129	[1]	0	[1]
U.S. Government and municipal bonds	0	[1]	0	[1]
Corporate debt securities	0	[1]	0	[1]
Mortgage-backed securities	0	[1]	0	[1]
Other debt securities	0	[1]	0	[1]
Other investments:
Equity Securities	71	[4]	0
Debt securities	0		0
Derivatives:
Commodity contracts	761		1,069
Interest rate contracts	0		0
Derivatives:
Commodity contracts	417		354
Interest rate swaps	128		93
Foreign currency swaps	0		0
Netting [Member]
Derivatives:
Commodity contracts	(3,906)	[5]	(2,972)	[5]
Interest rate contracts	37	[5]	0	[5]
Derivatives:
Commodity contracts	(3,782)	[5]	(2,693)	[5]
Interest rate swaps	37	[5]	0	[5]
Foreign currency swaps	0	[5]	0	[5]
FPL [Member]
Special use funds:
Equity securities	1,620	[1]	1,467	[1]
U.S. Government and municipal bonds	614	[1]	738	[1]
Corporate debt securities	478	[1]	421	[1]
Mortgage-backed securities	429	[1]	401	[1]
Other debt securities	46	[1]	46	[1]
Other investments:
Equity Securities	71
Derivatives:
Commodity contracts	4	[2]	48	[2]
Derivatives:
Commodity contracts	49	[2]	2	[2]
FPL [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member]
Special use funds:
Equity securities	313	[1]	291	[1]
U.S. Government and municipal bonds	468	[1]	584	[1]
Corporate debt securities	0	[1]	0	[1]
Mortgage-backed securities	0	[1]	0	[1]
Other debt securities	25	[1]	16	[1]
Other investments:
Equity Securities	0
Derivatives:
Commodity contracts	0		0
Derivatives:
Commodity contracts	0		0
FPL [Member] | Significant Other Observable Inputs (Level 2) [Member]
Special use funds:
Equity securities	1,178	[1],[3]	1,176	[1],[3]
U.S. Government and municipal bonds	146	[1]	154	[1]
Corporate debt securities	478	[1]	421	[1]
Mortgage-backed securities	429	[1]	401	[1]
Other debt securities	21	[1]	30	[1]
Other investments:
Equity Securities	0
Derivatives:
Commodity contracts	11		53
Derivatives:
Commodity contracts	57		7
FPL [Member] | Significant Unobservable Inputs (Level 3) [Member]
Special use funds:
Equity securities	129	[1]	0	[1]
U.S. Government and municipal bonds	0	[1]	0	[1]
Corporate debt securities	0	[1]	0	[1]
Mortgage-backed securities	0	[1]	0	[1]
Other debt securities	0	[1]	0	[1]
Other investments:
Equity Securities	71	[4]
Derivatives:
Commodity contracts	4		2
Derivatives:
Commodity contracts	3		2
FPL [Member] | Netting [Member]
Derivatives:
Commodity contracts	(11)	[5]	(7)	[5]
Derivatives:
Commodity contracts	$ (11)	[5]	$ (7)	[5]

[1] Excludes investments accounted for under the equity method and loans not measured at fair value on a recurring basis. See Fair Value of Financial Instruments Recorded at the Carrying Amount below.

[2] See Note 3 - Fair Value of Derivative Instruments for a reconciliation of net derivatives to NEE's and FPL's condensed consolidated balance sheets.

[3] Primarily invested in commingled funds whose underlying securities would be Level 1 if those securities were held directly by NEE or FPL.

[4] Represents investments associated with noncontrolling interests in a limited partnership. See Note 7 - FPL.

[5] Includes the effect of the contractual ability to settle contracts under master netting arrangements and margin cash collateral payments and receipts. NEE and FPL also have contract settlement receivable and payable balances that are subject to the master netting arrangements but are not offset within the condensed consolidated balance sheets and are recorded in customer receivables - net and accounts payable, respectively.