Derivative Instruments (Credit-Risk-Related Contingent Features) (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Fair value of derivative instruments with credit-risk-related contingent features that were in a liability position	$ 4,100,000,000	$ 4,700,000,000
Total required posted collateral should FPL's and Capital Holdings' credit ratings fall to BBB/Baa2	440,000,000	510,000,000
Total required posted collateral should FPL's and Capital Holdings' credit ratings fall below investment grade	2,400,000,000	2,400,000,000
Additional collateral requirements if non-ratings based contract provisions are triggered	1,400,000,000	1,700,000,000
Collateral already posted, aggregate fair value	532,000,000	691,000,000
Letters of credit posted through the normal course of business that could be applied toward the collateral requirements related to derivative instruments with credit-risk-related contingent features	1,440,000,000	1,595,000,000
Florida Power & Light Company
Derivative [Line Items]
Fair value of derivative instruments with credit-risk-related contingent features that were in a liability position	18,000,000	14,000,000
Total required posted collateral should FPL's and Capital Holdings' credit ratings fall to BBB/Baa2	0	0
Total required posted collateral should FPL's and Capital Holdings' credit ratings fall below investment grade	10,000,000	15,000,000
Additional collateral requirements if non-ratings based contract provisions are triggered	30,000,000	50,000,000
Collateral already posted, aggregate fair value	0	0
Letters of credit posted through the normal course of business that could be applied toward the collateral requirements related to derivative instruments with credit-risk-related contingent features	$ 0	$ 0