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, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special use funds: nuclear decommissioning fund assets	$ 9,754	$ 8,697
Available for sale debt securities amortized cost	$ 3,629	3,329
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity	8 years
Other investments weighted average maturity	7 years
Other assets, current	$ 1,236	1,335
Other	8,746	7,704
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special Use Funds Fair Value Disclosure	1,337	1,186
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure	650	777
Long Term Debt Including Current Maturities Fair Value And Carrying Value	73,657	68,306
Other assets, current	415	567
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special Use Funds Fair Value Disclosure	1,338	1,187
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure	650	777
Long Term Debt Including Current Maturities Fair Value And Carrying Value	72,495	64,103
Other	235	210
Florida Power & Light Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special use funds: nuclear decommissioning fund assets	6,824	6,049
Available for sale debt securities amortized cost	$ 1,777	1,693
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity	8 years
Other assets, current	$ 216	144
Other	697	654
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	918	856
Long Term Debt Including Current Maturities Fair Value And Carrying Value	26,741	25,274
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	918	856
Long Term Debt Including Current Maturities Fair Value And Carrying Value	$ 25,906	$ 23,430