Fair Value Measurements (Fair Value of Instruments Recorded at Other Than Fair Value and Special Use Funds) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special use funds: nuclear decommissioning fund assets	$ 6,037		$ 6,880
Special Use Funds Storm Fund Assets	76		74
Available for sale debt securities amortized cost	$ 2,009		2,030
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity	8 years
Fair Value Assumptions, Expected Term	1 year
Carrying Amount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special Use Funds Fair Value Disclosure	$ 931		892
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure	23		30
Long Term Debt Including Current Maturities Fair Value And Carrying Value	43,605		39,667
Estimated Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special Use Funds Fair Value Disclosure	930		891
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure	23		30
Long Term Debt Including Current Maturities Fair Value And Carrying Value	45,791		42,928
FPL [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special use funds: nuclear decommissioning fund assets	4,160		4,697
Special Use Funds Storm Fund Assets	76		74
Available for sale debt securities amortized cost	$ 1,508		1,523
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity	9 years
Fair Value Assumptions, Expected Term	1 year
FPL [Member] | Carrying Amount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special Use Funds Fair Value Disclosure	$ 736		706
Long Term Debt Including Current Maturities Fair Value And Carrying Value	15,422		14,161
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	735		705
Long Term Debt Including Current Maturities Fair Value And Carrying Value	17,721		16,448
Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
marketable securities, unrealized gain (loss) recognized during the period on securities still held	(808)	$ 367
Equity Securities [Member] | FPL [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
marketable securities, unrealized gain (loss) recognized during the period on securities still held	$ (502)	$ 234
Other Current Liabilities [Member] | Carrying Amount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long Term Debt Including Current Maturities Fair Value And Carrying Value			$ 463