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Non-Derivative Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Other Investments [Abstract] |  |
Restricted Cash and Cash Equivalents, Statement of Financial Position [Extensible Enumeration] | Other | Other
Fair Value, Recurring [Member] |  |
Assets [Abstract] |  |
Cash equivalents and restricted cash - equity securities | $ 961 | $ 176
Special use funds [Abstract] |  |
Equity securities | 4,437 | 5,511
U.S. Government and municipal bonds | 704 | 845
Corporate debt securities | 722 | 962
Asset-backed securities | 615 | 663
Other debt securities | 20 | 35
Other Investments [Abstract] |  |
Equity securities | 31 | 72
Debt securities | 535 | 285
Level 1 | Fair Value, Recurring [Member] |  |
Assets [Abstract] |  |
Cash equivalents and restricted cash - equity securities | 961 | 176
Restricted cash | 69 | 56
Special use funds [Abstract] |  |
Equity securities | 2,062 | 2,538
U.S. Government and municipal bonds | 641 | 770
Corporate debt securities | 6 | 7
Asset-backed securities | 0 | 0
Other debt securities | 1 | 2
Other Investments [Abstract] |  |
Equity securities | 30 | 70
Debt securities | 117 | 111
Level 2 | Fair Value, Recurring [Member] |  |
Assets [Abstract] |  |
Cash equivalents and restricted cash - equity securities | 0 | 0
Special use funds [Abstract] |  |
Equity securities | 2,375 | 2,973
U.S. Government and municipal bonds | 63 | 75
Corporate debt securities | 716 | 955
Asset-backed securities | 615 | 663
Other debt securities | 19 | 33
Other Investments [Abstract] |  |
Equity securities | 1 | 2
Debt securities | 300 | 162
Level 3 | Fair Value, Recurring [Member] |  |
Assets [Abstract] |  |
Cash equivalents and restricted cash - equity securities | 0 | 0
Special use funds [Abstract] |  |
Equity securities | 0 | 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 | $ 118 | $ 12
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 | $ 36 | $ 58
Special use funds [Abstract] |  |
Equity securities | 2,905 | 3,552
U.S. Government and municipal bonds | 534 | 668
Corporate debt securities | 553 | 726
Asset-backed securities | 473 | 515
Other debt securities | 12 | 25
Other Investments [Abstract] |  |
Equity securities | 9 | 13
Debt securities | 114 |
FPL [Member] | Level 1 | Fair Value, Recurring [Member] |  |
Assets [Abstract] |  |
Cash equivalents and restricted cash - equity securities | 36 | 58
Restricted cash | 33 | 53
Special use funds [Abstract] |  |
Equity securities | 743 | 862
U.S. Government and municipal bonds | 505 | 624
Corporate debt securities | 6 | 6
Asset-backed securities | 0 | 0
Other debt securities | 1 | 2
Other Investments [Abstract] |  |
Equity securities | 9 | 13
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 | 2,162 | 2,690
U.S. Government and municipal bonds | 29 | 44
Corporate debt securities | 547 | 720
Asset-backed securities | 473 | 515
Other debt securities | 11 | 23
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 | 0 | 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 |

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