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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

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- Definition Amount of cash and cash equivalent restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-8 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-4 + Details
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