Fair Value Measurements (Fair Value of Instruments Recorded at Other Than Fair Value and Special Use Funds) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special use funds: nuclear decommissioning fund assets	$ 6,724		$ 6,724		$ 6,880
Special Use Funds Storm Fund Assets	76		76		74
Available for sale debt securities amortized cost	2,001		$ 2,001		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	879		$ 879		892
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure	24		24		30
Long Term Debt Including Current Maturities Fair Value And Carrying Value	45,735		45,735		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	878		878		891
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure	24		24		30
Long Term Debt Including Current Maturities Fair Value And Carrying Value	50,020		50,020		42,928
FPL [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special use funds: nuclear decommissioning fund assets	4,614		4,614		4,697
Special Use Funds Storm Fund Assets	76		76		74
Available for sale debt securities amortized cost	1,498		$ 1,498		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	695		$ 695		706
Long Term Debt Including Current Maturities Fair Value And Carrying Value	14,419		14,419		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	694		694		705
Long Term Debt Including Current Maturities Fair Value And Carrying Value	18,007		18,007		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	602	$ 116	(190)	$ 481
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	$ 395	$ 77	$ (96)	$ 311
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