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Non-Derivative Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Other Investments [Abstract] |  |  |  |
Restricted Cash and Cash Equivalents, Statement of Financial Position [Extensible Enumeration] |  | Other | Other |
Noncontrolling Interest [Member] |  |  |  |
Other Investments [Abstract] |  |  |  |
Disposal of subsidiaries with noncontrolling interests | [1] | $ (846) | $ (165) | $ (1,494)
Fair Value, Recurring [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Cash equivalents and restricted cash - equity securities |  | 677 | 1,972 |
Special use funds [Abstract] |  |  |  |
Equity securities |  | 6,164 | 5,290 |
U.S. Government and municipal bonds |  | 722 | 757 |
Corporate debt securities |  | 685 | 623 |
Asset-backed securities |  | 873 | 822 |
Other debt securities |  | 14 | 20 |
Other Investments [Abstract] |  |  |  |
Equity securities |  | 49 | 50 |
U.S. Government and municipal bonds |  | 161 | 291 |
Corporate debt securities |  | 869 | 523 |
Debt securities |  | 348 | 211 |
Level 1 | Fair Value, Recurring [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Cash equivalents and restricted cash - equity securities |  | 677 | 1,972 |
Restricted cash |  | 109 | 34 |
Special use funds [Abstract] |  |  |  |
Equity securities |  | 2,614 | 2,349 |
U.S. Government and municipal bonds |  | 663 | 700 |
Corporate debt securities |  | 5 | 3 |
Asset-backed securities |  | 0 | 0 |
Other debt securities |  | 0 | 6 |
Other Investments [Abstract] |  |  |  |
Equity securities |  | 48 | 50 |
U.S. Government and municipal bonds |  | 158 | 288 |
Corporate debt securities |  | 0 | 0 |
Debt securities |  | 0 | 0 |
Level 2 | Fair Value, Recurring [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Cash equivalents and restricted cash - equity securities |  | 0 | 0 |
Special use funds [Abstract] |  |  |  |
Equity securities |  | 3,321 | 2,742 |
U.S. Government and municipal bonds |  | 59 | 57 |
Corporate debt securities |  | 680 | 620 |
Asset-backed securities |  | 873 | 822 |
Other debt securities |  | 14 | 14 |
Other Investments [Abstract] |  |  |  |
Equity securities |  | 1 | 0 |
U.S. Government and municipal bonds |  | 3 | 3 |
Corporate debt securities |  | 758 | 408 |
Debt securities |  | 295 | 196 |
Level 3 | Fair Value, Recurring [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Cash equivalents and restricted cash - equity securities |  | 0 | 0 |
Special use funds [Abstract] |  |  |  |
Equity securities |  | 229 | 199 |
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 [Abstract] |  |  |  |
Equity securities |  | 0 | 0 |
U.S. Government and municipal bonds |  | 0 | 0 |
Corporate debt securities |  | 111 | 115 |
Debt securities |  | $ 53 | $ 15 |
FPL [Member] |  |  |  |
Other Investments [Abstract] |  |  |  |
Restricted Cash and Cash Equivalents, Statement of Financial Position [Extensible Enumeration] |  | Other | Other |
FPL [Member] | Fair Value, Recurring [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Cash equivalents and restricted cash - equity securities |  | $ 101 | $ 12 |
Special use funds [Abstract] |  |  |  |
Equity securities |  | 4,219 | 3,536 |
U.S. Government and municipal bonds |  | 561 | 583 |
Corporate debt securities |  | 510 | 458 |
Asset-backed securities |  | 660 | 606 |
Other debt securities |  | 10 | 11 |
Other Investments [Abstract] |  |  |  |
Equity securities |  | 8 | 9 |
FPL [Member] | Level 1 | Fair Value, Recurring [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Cash equivalents and restricted cash - equity securities |  | 101 | 12 |
Restricted cash |  | 101 | 11 |
Special use funds [Abstract] |  |  |  |
Equity securities |  | 1,028 | 863 |
U.S. Government and municipal bonds |  | 522 | 556 |
Corporate debt securities |  | 4 | 3 |
Asset-backed securities |  | 0 | 0 |
Other debt securities |  | 0 | 5 |
Other Investments [Abstract] |  |  |  |
Equity securities |  | 8 | 9 |
FPL [Member] | Level 2 | Fair Value, Recurring [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Cash equivalents and restricted cash - equity securities |  | 0 | 0 |
Special use funds [Abstract] |  |  |  |
Equity securities |  | 2,987 | 2,474 |
U.S. Government and municipal bonds |  | 39 | 27 |
Corporate debt securities |  | 506 | 455 |
Asset-backed securities |  | 660 | 606 |
Other debt securities |  | 10 | 6 |
Other Investments [Abstract] |  |  |  |
Equity securities |  | 0 | 0 |
FPL [Member] | Level 3 | Fair Value, Recurring [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Cash equivalents and restricted cash - equity securities |  | 0 | 0 |
Special use funds [Abstract] |  |  |  |
Equity securities |  | 204 | 199 |
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 [Abstract] |  |  |  |
Equity securities |  | $ 0 | $ 0 |
[1] | See Note 1 – Disposal of Businesses/Assets.

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