Derivative Instruments (Credit-Risk-Related Contingent Features) (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Fair value of derivative instruments with credit-risk-related contingent features that were in a liability position	$ 7,500,000,000	$ 4,100,000,000
Total required posted collateral should FPL's and Capital Holdings' credit ratings fall to BBB/Baa2	1,240,000,000	645,000,000
Total required posted collateral should FPL's and Capital Holdings' credit ratings fall below investment grade	3,900,000,000	2,700,000,000
Additional collateral requirements if non-ratings based contract provisions are triggered	1,100,000,000	1,000,000,000
Collateral already posted, aggregate fair value	99,000,000	84,000,000
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	1,200,000,000	1,100,000,000
Florida Power & Light Company
Derivative [Line Items]
Fair value of derivative instruments with credit-risk-related contingent features that were in a liability position	17,000,000	12,000,000
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	20,000,000	35,000,000
Additional collateral requirements if non-ratings based contract provisions are triggered	135,000,000	145,000,000
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