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Derivative Instruments (Income Statement Disclosure) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Gains (losses) related to cash flow hedges [Abstract]      
Gains (losses) recognized in OCI $ (161) $ (400) $ (8)
Gains (losses) reclassified from AOCI to net income (69) [1] (34) [1] 73 [1]
Gains (losses) recognized in income 0 0 1 [2]
Gains (losses) related to derivatives not designated as hedging instruments [Abstract]      
Gains (losses) related to derivatives not designated as hedging instruments 149 484 550
Losses on commodity contracts, recorded as regulatory assets and or liabilities on the balance sheet due to regulatory treatment 177 646 665
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 44 28 11
Number of derivative instruments held 6 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 0 20
Gains (losses) reclassified from AOCI to net income 8 [1] 41 [1] 118 [1]
Gains (losses) recognized in income 0 0 1 [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 171 [3] 473 [3] 531 [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 38 0 1
Foreign currency swap [Member]
     
Gains (losses) related to cash flow hedges [Abstract]      
Gains (losses) recognized in OCI (30) (17) 24
Gains (losses) reclassified from AOCI to net income (21) [1],[4] 1 [1],[5] 20 [1],[5]
Gains (losses) recognized in income 0 0 0
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 3 4 4
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 (60) 22 18
Interest rate swaps [Member]
     
Gains (losses) related to cash flow hedges [Abstract]      
Gains (losses) recognized in OCI (131) (383) (52)
Gains (losses) reclassified from AOCI to net income (56) [1] (76) [1] (65) [1]
Gains (losses) recognized in income 0 0 0
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 $ 0 $ (11) $ 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] For the years ended December 31, 2012, 2011 and 2010, FPL recorded approximately $177 million, $646 million and $665 million of losses, respectively, related to commodity contracts as regulatory assets on its consolidated balance sheets.
[4] Loss of approximately $3 million is included in interest expense and the balance is included in other - net.
[5] Loss of approximately $4 million is included in interest expense and the balance is included in other - net.