Summary of Significant Accounting and Reporting Policies - Operating Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Summary of Significant Accounting Policies [Line Items]
Revenue from contracts with customers	$ 24,800	$ 23,000	$ 18,800
FPL [Member]
Summary of Significant Accounting Policies [Line Items]
Revenue from contracts with customers	18,200	17,200	14,100
Franchise and Gross Receipts Taxes [Member]
Summary of Significant Accounting Policies [Line Items]
Revenue from contracts with customers	1,139	1,035	852
Franchise and Gross Receipts Taxes [Member] | FPL [Member]
Summary of Significant Accounting Policies [Line Items]
Revenue from contracts with customers	$ 1,139	$ 1,035	$ 852