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Non-Derivative Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - Fair value measurements made on a recurring basis [Member] - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Cash equivalents:    
Equity securities $ 1,326 $ 677
Special use funds:    
Equity securities 6,907 6,164
U.S. Government and municipal bonds 729 722
Corporate debt securities 709 685
Asset-backed securities 950 873
Other debt securities 18 14
Other investments:    
Equity Securities 104 49
U.S. Government and Municipal Bonds 99 161
Corporate Debt Securities 1,290 869
Other Debt Securities 311 348
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring [Line Items]    
Restricted cash 45 109
Cash equivalents:    
Equity securities 1,326 677
Special use funds:    
Equity securities 2,926 2,614
U.S. Government and municipal bonds 664 663
Corporate debt securities 10 5
Asset-backed securities 0 0
Other debt securities 1 0
Other investments:    
Equity Securities 51 48
U.S. Government and Municipal Bonds 96 158
Corporate Debt Securities 0 0
Other Debt Securities 0 0
Level 2    
Cash equivalents:    
Equity securities 0 0
Special use funds:    
Equity securities 3,751 3,321
U.S. Government and municipal bonds 65 59
Corporate debt securities 699 680
Asset-backed securities 950 873
Other debt securities 17 14
Other investments:    
Equity Securities 1 1
U.S. Government and Municipal Bonds 3 3
Corporate Debt Securities 1,169 758
Other Debt Securities 281 295
Level 3    
Cash equivalents:    
Equity securities 0 0
Special use funds:    
Equity securities 230 229
U.S. Government and municipal bonds 0 0
Corporate debt securities 0 0
Asset-backed securities 0 0
Other debt securities 0 0
Other investments:    
Equity Securities 52 0
U.S. Government and Municipal Bonds 0 0
Corporate Debt Securities 121 111
Other Debt Securities 30 53
Florida Power & Light Company    
Cash equivalents:    
Equity securities 39 101
Special use funds:    
Equity securities 4,786 4,219
U.S. Government and municipal bonds 590 561
Corporate debt securities 519 510
Asset-backed securities 718 660
Other debt securities 11 10
Other investments:    
Equity Securities 7 8
Florida Power & Light Company | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring [Line Items]    
Restricted cash 37 101
Cash equivalents:    
Equity securities 39 101
Special use funds:    
Equity securities 1,166 1,028
U.S. Government and municipal bonds 550 522
Corporate debt securities 9 4
Asset-backed securities 0 0
Other debt securities 1 0
Other investments:    
Equity Securities 7 8
Florida Power & Light Company | Level 2    
Cash equivalents:    
Equity securities 0 0
Special use funds:    
Equity securities 3,415 2,987
U.S. Government and municipal bonds 40 39
Corporate debt securities 510 506
Asset-backed securities 718 660
Other debt securities 10 10
Other investments:    
Equity Securities 0 0
Florida Power & Light Company | Level 3    
Cash equivalents:    
Equity securities 0 0
Special use funds:    
Equity securities 205 204
U.S. Government and municipal bonds 0 0
Corporate debt securities 0 0
Asset-backed securities 0 0
Other debt securities 0 0
Other investments:    
Equity Securities $ 0 $ 0