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Fair Value Measurements (Fair Value of Instruments Recorded at Carrying Amount) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Storm Fund Assets $ 75 $ 74
Special use funds: nuclear decommissioning fund assets 5,215 5,064
Available for sale debt securities amortized cost 1,874 1,823
Available For Sale Securities Equity Securities Amortized Cost $ 1,512 1,505
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity 9 years  
Special Use Funds Storm Fund Weighted Average Maturity 3 years  
Liabilities associated with assets held-for-sale [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt $ 443 938
Estimated Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Fair Value Disclosure 659 675
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure 781 722
Long Term Debt Including Current Maturities Fair Value Disclosure 32,747 30,412
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 20,036 18,031
Carrying Amount [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Fair Value Disclosure 659 675
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure 520 512
Long Term Debt Including Current Maturities Fair Value Disclosure 30,122 28,897
FPL [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Storm Fund Assets 75 74
Special use funds: nuclear decommissioning fund assets 3,535 3,430
Available for sale debt securities amortized cost 1,443 1,409
Available For Sale Securities Equity Securities Amortized Cost $ 743 732
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity 9 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 $ 517 528
Long Term Debt Including Current Maturities Fair Value Disclosure 11,894 11,028
FPL [Member] | Carrying Amount [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Fair Value Disclosure 517 528
Long Term Debt Including Current Maturities Fair Value Disclosure $ 9,991 $ 10,020