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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, 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] | $ (165) | $ (1,494)
Fair Value, Recurring [Member] |  |  |
Assets [Abstract] |  |  |
Cash equivalents and restricted cash - equity securities |  | 1,972 | 961
Special use funds [Abstract] |  |  |
Equity securities |  | 5,290 | 4,437
U.S. Government and municipal bonds |  | 757 | 704
Corporate debt securities |  | 623 | 722
Asset-backed securities |  | 822 | 615
Other debt securities |  | 20 | 20
Other Investments [Abstract] |  |  |
Equity securities |  | 50 | 31
U.S. Government and municipal bonds |  | 291 | 235
Corporate debt securities |  | 523 | 233
Debt securities |  | 211 | 67
Level 1 | Fair Value, Recurring [Member] |  |  |
Assets [Abstract] |  |  |
Cash equivalents and restricted cash - equity securities |  | 1,972 | 961
Restricted cash |  | 34 | 69
Special use funds [Abstract] |  |  |
Equity securities |  | 2,349 | 2,062
U.S. Government and municipal bonds |  | 700 | 641
Corporate debt securities |  | 3 | 6
Asset-backed securities |  | 0 | 0
Other debt securities |  | 6 | 1
Other Investments [Abstract] |  |  |
Equity securities |  | 50 | 30
U.S. Government and municipal bonds |  | 288 | 117
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 |  | 2,742 | 2,375
U.S. Government and municipal bonds |  | 57 | 63
Corporate debt securities |  | 620 | 716
Asset-backed securities |  | 822 | 615
Other debt securities |  | 14 | 19
Other Investments [Abstract] |  |  |
Equity securities |  | 0 | 1
U.S. Government and municipal bonds |  | 3 | 118
Corporate debt securities |  | 408 | 125
Debt securities |  | 196 | 57
Level 3 | Fair Value, Recurring [Member] |  |  |
Assets [Abstract] |  |  |
Cash equivalents and restricted cash - equity securities |  | 0 | 0
Special use funds [Abstract] |  |  |
Equity securities |  | 199 | 0
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 |  | 115 | 108
Debt securities |  | $ 15 | $ 10
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 |  | $ 12 | $ 36
Special use funds [Abstract] |  |  |
Equity securities |  | 3,536 | 2,905
U.S. Government and municipal bonds |  | 583 | 534
Corporate debt securities |  | 458 | 553
Asset-backed securities |  | 606 | 473
Other debt securities |  | 11 | 12
Other Investments [Abstract] |  |  |
Equity securities |  | 9 | 9
Debt securities |  |  | 114
FPL [Member] | Level 1 | Fair Value, Recurring [Member] |  |  |
Assets [Abstract] |  |  |
Cash equivalents and restricted cash - equity securities |  | 12 | 36
Restricted cash |  | 11 | 33
Special use funds [Abstract] |  |  |
Equity securities |  | 863 | 743
U.S. Government and municipal bonds |  | 556 | 505
Corporate debt securities |  | 3 | 6
Asset-backed securities |  | 0 | 0
Other debt securities |  | 5 | 1
Other Investments [Abstract] |  |  |
Equity securities |  | 9 | 9
Debt securities |  |  | 0
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 |  | 2,474 | 2,162
U.S. Government and municipal bonds |  | 27 | 29
Corporate debt securities |  | 455 | 547
Asset-backed securities |  | 606 | 473
Other debt securities |  | 6 | 11
Other Investments [Abstract] |  |  |
Equity securities |  | 0 | 0
Debt securities |  |  | 114
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 |  | 199 | 0
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
Debt securities |  |  | $ 0
[1] | See Note 1 – Disposal of Businesses/Assets and Sale of Noncontrolling Ownership Interests.

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