Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Special use funds [Abstract]
Fair value of investments in commingled funds whose underlying investments would be Level 1 if those investments were held directly by the registrant	$ 1,300		$ 1,214
Fair Value, Measurements, Recurring [Member]
Assets [Abstract]
Cash equivalents - equity securities	20		23
Special use funds [Abstract]
Equity securities	2,506	[1]	2,154	[1]
U.S. Government and municipal bonds	827	[1]	594	[1]
Corporate debt securities	597	[1]	572	[1]
Mortgage-backed securities	479	[1]	560	[1]
Other debt securities	60	[1]	41	[1]
Derivatives [Abstract]
Commodity contracts	1,571	[2]	1,361	[2]
Interest rate contracts	90	[2]	76	[2]
Derivatives [Abstract]
Commodity contracts	940	[2]	564	[2]
Interest rate contracts	220	[2]	387	[2]
Foreign currency swaps	151	[2]	66	[2]
Other Investments [Abstract]
Other Investments equity securities fair value disclosure	51		7
Other Investments debt securities fair value disclosure	118		117
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets [Abstract]
Cash equivalents - equity securities	20		23
Special use funds [Abstract]
Equity securities	1,170	[1]	914	[1]
U.S. Government and municipal bonds	647	[1]	451	[1]
Corporate debt securities	0	[1]	0	[1]
Mortgage-backed securities	0	[1]	0	[1]
Other debt securities	16	[1]	15	[1]
Derivatives [Abstract]
Commodity contracts	1,368		1,187
Interest rate contracts	0		0
Derivatives [Abstract]
Commodity contracts	1,285		1,240
Interest rate contracts	0		0
Foreign currency swaps	0		0
Other Investments [Abstract]
Other Investments equity securities fair value disclosure	51		7
Other Investments debt securities fair value disclosure	11		11
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets [Abstract]
Cash equivalents - equity securities	0		0
Special use funds [Abstract]
Equity securities	1,336	[1],[3]	1,240	[1],[4]
U.S. Government and municipal bonds	180	[1]	143	[1]
Corporate debt securities	597	[1]	572	[1]
Mortgage-backed securities	479	[1]	560	[1]
Other debt securities	44	[1]	26	[1]
Derivatives [Abstract]
Commodity contracts	2,106		2,251
Interest rate contracts	90		76
Derivatives [Abstract]
Commodity contracts	1,994		1,844
Interest rate contracts	127		387
Foreign currency swaps	151		66
Other Investments [Abstract]
Other Investments equity securities fair value disclosure	0		0
Other Investments debt securities fair value disclosure	107		106
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets [Abstract]
Cash equivalents - equity securities	0		0
Special use funds [Abstract]
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 [Abstract]
Commodity contracts	1,069		794
Interest rate contracts	0		0
Derivatives [Abstract]
Commodity contracts	354		228
Interest rate contracts	93		0
Foreign currency swaps	0		0
Other Investments [Abstract]
Other Investments equity securities fair value disclosure	0		0
Other Investments debt securities fair value disclosure	0		0
Netting [Member] | Fair Value, Measurements, Recurring [Member]
Assets [Abstract]
Cash equivalents - equity securities	0	[5]	0	[5]
Special use funds [Abstract]
Equity securities	0	[1],[5]	0	[1],[5]
U.S. Government and municipal bonds	0	[1],[5]	0	[1],[5]
Corporate debt securities	0	[1],[5]	0	[1],[5]
Mortgage-backed securities	0	[1],[5]	0	[1],[5]
Other debt securities	0	[1],[5]	0	[1],[5]
Derivatives [Abstract]
Commodity contracts	(2,972)	[5]	(2,871)	[5]
Interest rate contracts	0	[5]	0	[5]
Derivatives [Abstract]
Commodity contracts	(2,693)	[5]	(2,748)	[5]
Interest rate contracts	0	[5]	0	[5]
Foreign currency swaps	0	[5]	0	[5]
Other Investments [Abstract]
Other Investments equity securities fair value disclosure	0	[5]	0	[5]
Other Investments debt securities fair value disclosure	0	[5]	0	[5]
FPL [Member] | Fair Value, Measurements, Recurring [Member]
Special use funds [Abstract]
Special Use Funds Invested In Commingled Funds Fair Value Disclosure	1,141		1,093
Equity securities	1,467	[1]	1,335	[1]
U.S. Government and municipal bonds	738	[1]	509	[1]
Corporate debt securities	421	[1]	397	[1]
Mortgage-backed securities	401	[1]	475	[1]
Other debt securities	46	[1]	32	[1]
Derivatives [Abstract]
Commodity contracts	48	[2]	5	[2]
Derivatives [Abstract]
Commodity contracts	2	[2]	20	[2]
FPL [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Special use funds [Abstract]
Equity securities	291	[1]	217	[1]
U.S. Government and municipal bonds	584	[1]	390	[1]
Corporate debt securities	0	[1]	0	[1]
Mortgage-backed securities	0	[1]	0	[1]
Other debt securities	16	[1]	16	[1]
Derivatives [Abstract]
Commodity contracts	0		0
Derivatives [Abstract]
Commodity contracts	0		0
FPL [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Special use funds [Abstract]
Equity securities	1,176	[1],[3]	1,118	[1],[4]
U.S. Government and municipal bonds	154	[1]	119	[1]
Corporate debt securities	421	[1]	397	[1]
Mortgage-backed securities	401	[1]	475	[1]
Other debt securities	30	[1]	16	[1]
Derivatives [Abstract]
Commodity contracts	53		14
Derivatives [Abstract]
Commodity contracts	7		31
FPL [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Special use funds [Abstract]
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 [Abstract]
Commodity contracts	2		3
Derivatives [Abstract]
Commodity contracts	2		1
FPL [Member] | Netting [Member] | Fair Value, Measurements, Recurring [Member]
Special use funds [Abstract]
Equity securities	0	[1],[5]	0	[1],[5]
U.S. Government and municipal bonds	0	[1],[5]	0	[1],[5]
Corporate debt securities	0	[1],[5]	0	[1],[5]
Mortgage-backed securities	0	[1],[5]	0	[1],[5]
Other debt securities	0	[1],[5]	0	[1],[5]
Derivatives [Abstract]
Commodity contracts	(7)	[5]	(12)	[5]
Derivatives [Abstract]
Commodity contracts	$ (7)	[5]	$ (12)	[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 consolidated balance sheets.

[3] At NEE, approximately $1,300 million ($1,141 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] At NEE, approximately $1,214 million ($1,093 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.

[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 consolidated balance sheets and are recorded in customer receivables - net and accounts payable, respectively.