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, 2025	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special use funds: nuclear decommissioning fund assets	$ 10,769	$ 9,799
Available for sale debt securities amortized cost	$ 4,081	3,720
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity	8 years
Other investments weighted average maturity	8 years
Other assets, current	$ 1,185	1,438
Other	10,903	9,459
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special Use Funds Fair Value Disclosure	1,457	1,342
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure	554	629
Long Term Debt Including Current Maturities Fair Value And Carrying Value	87,760	80,446
Other assets, current	348	396
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special Use Funds Fair Value Disclosure	1,458	1,343
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure	554	629
Long Term Debt Including Current Maturities Fair Value And Carrying Value	85,990	76,428
Other	206	233
Florida Power & Light Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special use funds: nuclear decommissioning fund assets	7,575	6,874
Available for sale debt securities amortized cost	$ 1,828	1,780
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity	8 years
Other assets, current	$ 186	257
Other	1,188	934
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	952	915
Long Term Debt Including Current Maturities Fair Value And Carrying Value	27,512	26,745
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	953	916
Long Term Debt Including Current Maturities Fair Value And Carrying Value	$ 25,802	$ 24,718