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Derivative Instruments (Income Statement Disclosure) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Gains (losses) related to cash flow hedges [Abstract]      
Gains (losses) recognized in OCI $ 129 $ (161) $ (400)
Gains (losses) reclassified from AOCI to net income(a) (105) [1] (69) [1] (34) [1]
Gains (losses) related to derivatives not designated as hedging instruments [Abstract]      
Gains (losses) related to derivatives not designated as hedging instruments 7 149 484
Gains (losses) on commodity contracts, recorded as regulatory assets and or liabilities on the balance sheet due to regulatory treatment 81 (177) (646)
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 (65) 44 28
Loss on sale of natural gas-fired generating assets [Member] | Discontinued Hedges [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Loss reclassified from AOCI to earnings     30
Gain (loss) included in other-net [Member] | Discontinued Hedges [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
Gains (losses) reclassified from AOCI to net income(a)   8 [1] 41 [1]
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 76 [2] 171 [2] 473 [2]
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 [2] 38 [2] 0 [2]
Foreign currency swap [Member]
     
Gains (losses) related to cash flow hedges [Abstract]      
Gains (losses) recognized in OCI (21) (30) (17)
Gains (losses) reclassified from AOCI to net income(a) (44) [1],[3] (21) [1],[4] 1 [1],[3]
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 3 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 (72) (60) 22
Interest Rate Contract [Member]
     
Gains (losses) related to cash flow hedges [Abstract]      
Gains (losses) recognized in OCI 150 (131) (383)
Gains (losses) reclassified from AOCI to net income(a) (61) [1] (56) [1] (76) [1]
Interest Rate Contract [Member] | Gain (loss) included in interest expense [Member]
     
Gains (losses) related to derivatives not designated as hedging instruments [Abstract]      
Gains (losses) related to derivatives not designated as hedging instruments 3 [5]    
Interest Rate Contract [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) [5]
[1] Included in operating revenues for commodity contracts and interest expense for interest rate contracts. 2011 excludes approximately $21 million of net losses related to the discontinuance of certain cash flow hedges. See further discussion above.
[2] For the year ended December 31, 2013, FPL recorded approximately $81 million of gains related to commodity contracts as regulatory liabilities on its consolidated balance sheet. For the years ended December 31, 2012 and 2011, FPL recorded approximately $177 million and $646 million of losses, respectively, related to commodity contracts as regulatory assets on its consolidated balance sheets.
[3] Loss of approximately $4 million is included in interest expense and the balance is included in other - net.
[4] Loss of approximately $3 million is included in interest expense and the balance is included in other - net.
[5] Included in interest expense for 2013 and other-net for 2011.