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	Jun. 30, 2014		Dec. 31, 2013
Cash equivalents:
Equity securities	$ 114		$ 20
Special use funds:
Equity securities	2,538	[1]	2,506	[1]
U.S. Government and municipal bonds	786	[1]	827	[1]
Corporate debt securities	662	[1]	597	[1]
Mortgage-backed securities	485	[1]	479	[1]
Other debt securities	61	[1]	60	[1]
Other investments:
Equity Securities	44		51
Debt securities	189		118
Derivatives:
Commodity contracts	1,400	[2]	1,571	[2]
Interest rate contracts	68	[2]	90	[2]
Foreign Currency Contract, Asset, Fair Value Disclosure	3	[2]
Derivatives:
Commodity contracts	974	[2]	940	[2]
Interest rate swaps	238	[2]	220	[2]
Foreign currency swaps	35	[2]	151	[2]
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member]
Cash equivalents:
Equity securities	114		20
Special use funds:
Equity securities	1,185	[1]	1,170	[1]
U.S. Government and municipal bonds	619	[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	43		51
Debt securities	20		11
Derivatives:
Commodity contracts	2,217		1,368
Interest rate contracts	0		0
Foreign Currency Contract, Asset, Fair Value Disclosure	0
Derivatives:
Commodity contracts	2,174		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	1,353	[1],[3]	1,336	[1],[3]
U.S. Government and municipal bonds	167	[1]	180	[1]
Corporate debt securities	662	[1]	597	[1]
Mortgage-backed securities	485	[1]	479	[1]
Other debt securities	36	[1]	44	[1]
Other investments:
Equity Securities	1		0
Debt securities	169		107
Derivatives:
Commodity contracts	2,213		2,106
Interest rate contracts	43		90
Foreign Currency Contract, Asset, Fair Value Disclosure	0
Derivatives:
Commodity contracts	2,169		1,994
Interest rate swaps	94		127
Foreign currency swaps	32		151
Significant Unobservable Inputs (Level 3) [Member]
Cash equivalents:
Equity securities	0		0
Special use funds:
Equity securities	0	[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	0		0
Debt securities	0		0
Derivatives:
Commodity contracts	1,052		1,069
Interest rate contracts	0		0
Foreign Currency Contract, Asset, Fair Value Disclosure	0
Derivatives:
Commodity contracts	579		354
Interest rate swaps	119		93
Foreign currency swaps	0		0
Netting [Member]
Derivatives:
Commodity contracts	(4,082)	[4]	(2,972)	[4]
Interest rate contracts	25	[4]	0	[4]
Foreign Currency Contract, Asset, Fair Value Disclosure	3	[4]
Derivatives:
Commodity contracts	(3,948)	[4]	(2,693)	[4]
Interest rate swaps	25	[4]	0	[4]
Foreign currency swaps	3	[4]	0	[4]
FPL [Member]
Special use funds:
Equity securities	1,461	[1]	1,467	[1]
U.S. Government and municipal bonds	662	[1]	738	[1]
Corporate debt securities	465	[1]	421	[1]
Mortgage-backed securities	420	[1]	401	[1]
Other debt securities	47	[1]	46	[1]
Derivatives:
Commodity contracts	84	[2]	48	[2]
Derivatives:
Commodity contracts	12	[2]	2	[2]
FPL [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member]
Special use funds:
Equity securities	279	[1]	291	[1]
U.S. Government and municipal bonds	512	[1]	584	[1]
Corporate debt securities	0	[1]	0	[1]
Mortgage-backed securities	0	[1]	0	[1]
Other debt securities	25	[1]	16	[1]
Derivatives:
Commodity contracts	0		0
Derivatives:
Commodity contracts	0		0
FPL [Member] | Significant Other Observable Inputs (Level 2) [Member]
Special use funds:
Equity securities	1,182	[1],[3]	1,176	[1],[3]
U.S. Government and municipal bonds	150	[1]	154	[1]
Corporate debt securities	465	[1]	421	[1]
Mortgage-backed securities	420	[1]	401	[1]
Other debt securities	22	[1]	30	[1]
Derivatives:
Commodity contracts	80		53
Derivatives:
Commodity contracts	11		7
FPL [Member] | Significant Unobservable Inputs (Level 3) [Member]
Special use funds:
Equity securities	0	[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]
Derivatives:
Commodity contracts	4		2
Derivatives:
Commodity contracts	1		2
FPL [Member] | Netting [Member]
Derivatives:
Commodity contracts	0	[4]	(7)	[4]
Derivatives:
Commodity contracts	$ 0	[4]	$ (7)	[4]

[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] 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.