Derivative Instruments (Credit-Risk-Related Contingent Features) (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Fair value of derivative instruments with credit-risk-related contingent features that were in a liability position	$ 4,200,000,000	$ 7,400,000,000
Total required posted collateral should FPL's and Capital Holdings' credit ratings fall to BBB/Baa2	365,000,000	1,625,000,000
Total required posted collateral should FPL's and Capital Holdings' credit ratings fall below investment grade	2,300,000,000	5,200,000,000
Additional collateral requirements if non-ratings based contract provisions are triggered	810,000,000	1,100,000,000
Collateral already posted, aggregate fair value	19,000,000	59,000,000
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	327,000,000	1,192,000,000
Florida Power & Light Company
Derivative [Line Items]
Fair value of derivative instruments with credit-risk-related contingent features that were in a liability position	15,000,000	15,000,000
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	25,000,000	20,000,000
Additional collateral requirements if non-ratings based contract provisions are triggered	90,000,000	185,000,000
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