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Fair Value Measurements (Fair Value of Instruments Recorded at Carrying Amount) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Storm Fund Assets $ 75 $ 75
Special use funds: nuclear decommissioning fund assets 5,135 5,091
Available for sale debt securities amortized cost 1,825 1,906
Available For Sale Securities Equity Securities Amortized Cost $ 1,564 1,366
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity 8 years  
Special Use Funds Storm Fund Weighted Average Maturity 3 years  
Estimated Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Fair Value Disclosure $ 556 567
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure 666 679
Long Term Debt Including Current Maturities Fair Value Disclosure 29,490 30,337
Estimated Fair Value [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long Term Debt Including Current Maturities Fair Value Disclosure 18,560 19,973
Carrying Amount [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Fair Value Disclosure 556 567
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure 524 525
Long Term Debt Including Current Maturities Fair Value Disclosure 27,998 27,876
FPL [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Storm Fund Assets 75 75
Special use funds: nuclear decommissioning fund assets 3,469 3,449
Available for sale debt securities amortized cost 1,406 1,519
Available For Sale Securities Equity Securities Amortized Cost $ 821 664
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity 8 years  
Special Use Funds Storm Fund Weighted Average Maturity 3 years  
FPL [Member] | Estimated Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Fair Value Disclosure $ 419 395
Long Term Debt Including Current Maturities Fair Value Disclosure 10,576 11,105
FPL [Member] | Carrying Amount [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Fair Value Disclosure 419 395
Long Term Debt Including Current Maturities Fair Value Disclosure $ 9,529 $ 9,473