Derivative Instruments (Balance Sheet Disclosure) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012 Not Designated as Hedging Instrument [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member]	Sep. 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]	Sep. 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]	Sep. 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	Sep. 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]	Sep. 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]	Sep. 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	Sep. 30, 2012 Derivatives designated as hedging instruments [Member]	Dec. 31, 2011 Derivatives designated as hedging instruments [Member]	Sep. 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]	Sep. 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]	Sep. 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	Sep. 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]	Sep. 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]	Sep. 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]	Sep. 30, 2012 FPL [Member]	Jun. 30, 2011 FPL [Member]	Sep. 30, 2012 FPL [Member] Not Designated as Hedging Instrument [Member]	Dec. 31, 2011 FPL [Member] Not Designated as Hedging Instrument [Member]	Sep. 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]		Sep. 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]	Sep. 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		Sep. 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]		Sep. 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]	Sep. 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	$ 4,858	$ 7,024	$ 922	$ 1,127	$ 1,775	$ 3,358	$ 1,913	$ 1,290	$ 233	$ 1,222	$ 0	$ 0	$ 15	$ 27	$ 80	$ 37	$ 26	$ 22	$ 0	$ 0	$ 54	$ 15	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0			$ 87	$ 14	$ 12	[1]	$ 11	[1]	$ 43	$ 1	$ 32	[2]	$ 2	[2]	$ 0	[3]	$ 0	[3]	$ 0	$ 0	$ 0	$ 0
Derivative Liability, Fair Value, Gross Liability	$ 4,009	$ 6,758	$ 426	$ 432	$ 2,233	$ 4,494	$ 884	$ 250	$ 464	$ 1,579	$ 2	$ 3	$ 0	$ 0	$ 399	$ 326	$ 0	$ 0	$ 97	$ 60	$ 0	$ 0	$ 294	$ 260	$ 3	$ 3	$ 5	$ 3			$ 114	$ 515	$ 4	[1]	$ 1	[1]	$ 110	$ 513	$ 0	[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.