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Derivative Instruments (Income Statement Disclosure) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Gains (losses) related to cash flow hedges [Abstract]      
Gains (losses) recognized in OCI $ (400) $ (8) $ 228
Gains (losses) reclassified from AOCI to net income (34) [1] 73 [1] 129 [1]
Gains (losses) recognized in income 0 [2] 1 [2] 29 [2]
Gains (losses) related to derivatives not designated as hedging instruments [Abstract]      
Gains (losses) related to derivatives not designated as hedging instruments 484 550 304
Losses on commodity contracts, recorded as regulatory assets and or liabilities on the balance sheet due to regulatory treatment 646 665 688
Discontinued Hedges [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Net loss reclassified from AOCI to earnings 21    
Fair Value Hedging [Member]
     
Gains (losses) related to derivatives not designated as hedging instruments [Abstract]      
Gain (loss) on fair value hedge reflected in interest expense 28 11 (6)
Number of derivative instruments held 6 3  
Loss on sale of natural gas-fired generating assets [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Loss reclassified from AOCI to earnings 30    
Gain (loss) included in other-net [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Gain reclassified from AOCI to earnings 9    
Commodity contracts [Member]
     
Gains (losses) related to cash flow hedges [Abstract]      
Gains (losses) recognized in OCI 0 20 197
Gains (losses) reclassified from AOCI to net income 41 [1] 118 [1] 164 [1]
Gains (losses) recognized in income 0 [2] 1 [2] 29 [2]
Commodity contracts [Member] | Gain (loss) included in operating revenues [Member]
     
Gains (losses) related to derivatives not designated as hedging instruments [Abstract]      
Gains (losses) related to derivatives not designated as hedging instruments 473 [3] 531 [3] 279 [3]
Commodity contracts [Member] | Gain (loss) included in fuel, purchased power and interchange [Member]
     
Gains (losses) related to derivatives not designated as hedging instruments [Abstract]      
Gains (losses) related to derivatives not designated as hedging instruments 0 1 28
Foreign currency swap [Member]
     
Gains (losses) related to cash flow hedges [Abstract]      
Gains (losses) recognized in OCI (17) 24 3
Gains (losses) reclassified from AOCI to net income 1 [1],[4] 20 [1],[4] 4 [1],[5]
Gains (losses) recognized in income 0 [2] 0 [2] 0 [2]
Foreign currency swap [Member] | Gain (loss) included in interest expense [Member]
     
Gains (losses) related to cash flow hedges [Abstract]      
Loss reclassified from AOCI to earnings 4 4 1
Foreign currency swap [Member] | Gain (loss) included in other-net [Member]
     
Gains (losses) related to derivatives not designated as hedging instruments [Abstract]      
Gains (losses) related to derivatives not designated as hedging instruments 22 18 (3)
Interest rate swaps [Member]
     
Gains (losses) related to cash flow hedges [Abstract]      
Gains (losses) recognized in OCI (383) (52) 28
Gains (losses) reclassified from AOCI to net income (76) [1] (65) [1] (39) [1]
Gains (losses) recognized in income 0 [2] 0 [2] 0 [2]
Interest rate swaps [Member] | Gain (loss) included in other-net [Member]
     
Gains (losses) related to derivatives not designated as hedging instruments [Abstract]      
Gains (losses) related to derivatives not designated as hedging instruments $ (11) $ 0 $ 0
[1] Included in operating revenues for commodity contracts and interest expense for interest rate swaps. In 2011, excludes approximately $21 million of net losses related to the discontinuance of certain cash flow hedges. See further discussion above.
[2] Represents the ineffective portion of the hedging instrument included in operating revenues.
[3] In addition, for the years ended December 31, 2011, 2010 and 2009, FPL recorded approximately $646 million, $665 million and $688 million of losses, respectively, related to commodity contracts as regulatory assets on its consolidated balance sheets.
[4] Loss of approximately $4 million is included in interest expense and the balance is included in other - net.
[5] Loss of approximately $1 million is included in interest expense and the balance is included in other - net.