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Non-Derivative Fair Value Measurements (Fair Value of Instruments Recorded at Other than Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Reported Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Fair Value Disclosure $ 919 $ 892
Other Investments Financial Instruments Fair Value Disclosure 29 30
Long Term Debt Including Current Maturities Fair Value Disclosure 46,082 39,667
Reported Value Measurement [Member] | Other Current Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long Term Debt Including Current Maturities Fair Value Disclosure 463  
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 920 891
Other Investments Financial Instruments Fair Value Disclosure 29 30
Long Term Debt Including Current Maturities Fair Value Disclosure 51,525 42,928
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 718 706
Long Term Debt Including Current Maturities Fair Value Disclosure 15,676 14,161
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 719 705
Long Term Debt Including Current Maturities Fair Value Disclosure $ 19,470 $ 16,448