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Fair Value Measurements (Fair Value of Instruments Recorded at Other than Fair Value) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Storm Fund Assets $ 68  
Decommissioning Fund Investments, Fair Value 5,818 $ 6,003
Available for sale debt securities amortized cost 1,994 1,921
Available-for-sale equity securities, amortized cost   1,521
Reported Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Fair Value Disclosure 884 743
Other Investments Primarily Notes Receivable Fair Value Disclosure 54 500
Long Term Debt Including Current Maturities Fair Value Disclosure 29,498 33,134
Estimate of Fair Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Fair Value Disclosure 883 744
Other Investments Primarily Notes Receivable Fair Value Disclosure 54 680
Long Term Debt Including Current Maturities Fair Value Disclosure 30,043 35,447
FPL[Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt 11,783 11,651
Special Use Funds Storm Fund Assets   0
Decommissioning Fund Investments, Fair Value 3,987 4,090
Available for sale debt securities amortized cost 1,542 1,443
Available-for-sale equity securities, amortized cost   783
FPL[Member] | Reported Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Fair Value Disclosure 693 593
Long Term Debt Including Current Maturities Fair Value Disclosure 11,783 11,702
FPL[Member] | Estimate of Fair Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Fair Value Disclosure 692 593
Long Term Debt Including Current Maturities Fair Value Disclosure 12,613 $ 13,285
Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities, unrealized gain (loss) on securities still held (259)  
Equity Securities [Member] | FPL[Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities, unrealized gain (loss) on securities still held $ (131)  
Nuclear Decommissioning Funds [Member] | Weighted Average [Member] | FPL[Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, term 8 years  
Storm Fund [Member] | Debt Securities [Member] | FPL[Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, term 1 year