Derivative Instruments (Balance Sheet Disclosure) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012 Not Designated as Hedging Instrument [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member]	Jun. 30, 2012 Not Designated as Hedging Instrument [Member] Commodity contracts [Member] Current derivative assets [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Commodity contracts [Member] Current derivative assets [Member]	Jun. 30, 2012 Not Designated as Hedging Instrument [Member] Commodity contracts [Member] Current derivative liabilities [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Commodity contracts [Member] Current derivative liabilities [Member]	Jun. 30, 2012 Not Designated as Hedging Instrument [Member] Commodity contracts [Member] Non Current Other Assets Member	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Commodity contracts [Member] Non Current Other Assets Member	Jun. 30, 2012 Not Designated as Hedging Instrument [Member] Commodity contracts [Member] Noncurrent derivative liabilities [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Commodity contracts [Member] Noncurrent derivative liabilities [Member]	Jun. 30, 2012 Not Designated as Hedging Instrument [Member] Foreign currency swaps [Member] Current derivative liabilities [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Foreign currency swaps [Member] Current derivative liabilities [Member]	Jun. 30, 2012 Not Designated as Hedging Instrument [Member] Foreign currency swaps [Member] Non Current Other Assets Member	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Foreign currency swaps [Member] Non Current Other Assets Member	Jun. 30, 2012 Derivatives designated as hedging instruments [Member]	Dec. 31, 2011 Derivatives designated as hedging instruments [Member]	Jun. 30, 2012 Derivatives designated as hedging instruments [Member] Interest Rate Contract [Member] Current derivative assets [Member]	Dec. 31, 2011 Derivatives designated as hedging instruments [Member] Interest Rate Contract [Member] Current derivative assets [Member]	Jun. 30, 2012 Derivatives designated as hedging instruments [Member] Interest Rate Contract [Member] Current derivative liabilities [Member]	Dec. 31, 2011 Derivatives designated as hedging instruments [Member] Interest Rate Contract [Member] Current derivative liabilities [Member]	Jun. 30, 2012 Derivatives designated as hedging instruments [Member] Interest Rate Contract [Member] Non Current Other Assets Member	Dec. 31, 2011 Derivatives designated as hedging instruments [Member] Interest Rate Contract [Member] Non Current Other Assets Member	Jun. 30, 2012 Derivatives designated as hedging instruments [Member] Interest Rate Contract [Member] Noncurrent derivative liabilities [Member]	Dec. 31, 2011 Derivatives designated as hedging instruments [Member] Interest Rate Contract [Member] Noncurrent derivative liabilities [Member]	Jun. 30, 2012 Derivatives designated as hedging instruments [Member] Foreign currency swaps [Member] Current derivative liabilities [Member]	Dec. 31, 2011 Derivatives designated as hedging instruments [Member] Foreign currency swaps [Member] Current derivative liabilities [Member]	Jun. 30, 2012 Derivatives designated as hedging instruments [Member] Foreign currency swaps [Member] Noncurrent derivative liabilities [Member]	Dec. 31, 2011 Derivatives designated as hedging instruments [Member] Foreign currency swaps [Member] Noncurrent derivative liabilities [Member]	Jun. 30, 2012 FPL [Member]	Jun. 30, 2011 FPL [Member]	Jun. 30, 2012 FPL [Member] Not Designated as Hedging Instrument [Member]	Dec. 31, 2011 FPL [Member] Not Designated as Hedging Instrument [Member]	Jun. 30, 2012 FPL [Member] Not Designated as Hedging Instrument [Member] Commodity contracts [Member] Current derivative assets [Member]		Dec. 31, 2011 FPL [Member] Not Designated as Hedging Instrument [Member] Commodity contracts [Member] Current derivative assets [Member]		Jun. 30, 2012 FPL [Member] Not Designated as Hedging Instrument [Member] Commodity contracts [Member] Current derivative liabilities [Member]	Dec. 31, 2011 FPL [Member] Not Designated as Hedging Instrument [Member] Commodity contracts [Member] Current derivative liabilities [Member]	Jun. 30, 2012 FPL [Member] Not Designated as Hedging Instrument [Member] Commodity contracts [Member] Non Current Other Assets Member		Dec. 31, 2011 FPL [Member] Not Designated as Hedging Instrument [Member] Commodity contracts [Member] Non Current Other Assets Member		Jun. 30, 2012 FPL [Member] Not Designated as Hedging Instrument [Member] Commodity contracts [Member] Noncurrent derivative liabilities [Member]		Dec. 31, 2011 FPL [Member] Not Designated as Hedging Instrument [Member] Commodity contracts [Member] Noncurrent derivative liabilities [Member]		Jun. 30, 2012 FPL [Member] Not Designated as Hedging Instrument [Member] Foreign currency swaps [Member] Current derivative liabilities [Member]	Dec. 31, 2011 FPL [Member] Not Designated as Hedging Instrument [Member] Foreign currency swaps [Member] Current derivative liabilities [Member]	Jun. 30, 2012 FPL [Member] Not Designated as Hedging Instrument [Member] Foreign currency swaps [Member] Non Current Other Assets Member	Dec. 31, 2011 FPL [Member] Not Designated as Hedging Instrument [Member] Foreign currency swaps [Member] Non Current Other Assets Member
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 7,174	$ 7,024	$ 1,412	$ 1,127	$ 2,939	$ 3,358	$ 1,721	$ 1,290	$ 1,096	$ 1,222	$ 0	$ 0	$ 6	$ 27	$ 68	$ 37	$ 27	$ 22	$ 0	$ 0	$ 41	$ 15	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0			$ 32	$ 14	$ 11	[1]	$ 11	[1]	$ 5	$ 1	$ 16	[2]	$ 2	[2]	$ 0	[3]	$ 0	[3]	$ 0	$ 0	$ 0	$ 0
Derivative Liability, Fair Value, Gross Liability	$ 6,457	$ 6,758	$ 730	$ 432	$ 3,833	$ 4,494	$ 429	$ 250	$ 1,462	$ 1,579	$ 3	$ 3	$ 0	$ 0	$ 363	$ 326	$ 0	$ 0	$ 64	$ 60	$ 0	$ 0	$ 285	$ 260	$ 3	$ 3	$ 11	$ 3			$ 334	$ 515	$ 0	[1]	$ 1	[1]	$ 332	$ 513	$ 2	[2]	$ 0	[2]	$ 0	[3]	$ 1	[3]	$ 0	$ 0	$ 0	$ 0

[1] Included in current other assets on FPL's condensed consolidated balance sheets.

[2] Included in noncurrent other assets on FPL's condensed consolidated balance sheets.

[3] Included in noncurrent other liabilities on FPL's condensed consolidated balance sheets.