Non-Derivative Fair Value Measurements (Fair Value of Instruments Recorded at Other Than Fair Value and Special Use Funds) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special use funds: nuclear decommissioning fund assets	$ 8,020	$ 7,495
Special Use Funds Storm Fund Assets	1	1
Available for sale debt securities amortized cost	$ 3,562	2,858
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity	9 years
Other investments weighted average maturity	6 years
Other assets, current	$ 2,442	1,107
Other	8,258	5,695
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special Use Funds Fair Value Disclosure	1,181	998
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure	696	246
Long Term Debt Including Current Maturities Fair Value And Carrying Value	67,162	61,889
Other assets, current	475	25
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special Use Funds Fair Value Disclosure	1,181	999
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure	696	246
Long Term Debt Including Current Maturities Fair Value And Carrying Value	60,952	57,892
Other	221	221
Florida Power & Light Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special use funds: nuclear decommissioning fund assets	5,595	5,220
Special Use Funds Storm Fund Assets	1	1
Available for sale debt securities amortized cost	$ 1,969	1,873
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity	9 years
Other assets, current	$ 741	143
Other	913	887
Florida Power & Light Company | Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special Use Funds Fair Value Disclosure	850	744
Long Term Debt Including Current Maturities Fair Value And Carrying Value	24,889	21,002
Florida Power & Light Company | Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special Use Funds Fair Value Disclosure	850	744
Long Term Debt Including Current Maturities Fair Value And Carrying Value	$ 22,275	$ 19,364