Non-Derivative 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, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special use funds: nuclear decommissioning fund assets	$ 8,417	$ 8,846
Special Use Funds Storm Fund Assets	75	76
Available for sale debt securities amortized cost	$ 2,695	2,438
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity	8 years
Fair Value Assumptions, Expected Term	2 years
Other investments Weighted Average Maturity	4 years
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special Use Funds Fair Value Disclosure	$ 894	906
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure	180	102
Long Term Debt Including Current Maturities Fair Value And Carrying Value	56,538	52,745
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special Use Funds Fair Value Disclosure	894	907
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure	180	102
Long Term Debt Including Current Maturities Fair Value And Carrying Value	57,304	57,290
Florida Power & Light Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Special use funds: nuclear decommissioning fund assets	5,803	6,082
Special Use Funds Storm Fund Assets	75	76
Available for sale debt securities amortized cost	$ 1,840	1,877
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity	8 years
Fair Value Assumptions, Expected Term	2 years
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	$ 658	672
Long Term Debt Including Current Maturities Fair Value And Carrying Value	20,993	18,510
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	659	672
Long Term Debt Including Current Maturities Fair Value And Carrying Value	$ 22,061	$ 21,379