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Non-Derivative Fair Value Measurements (Gains and Losses) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule of Available-for-sale Securities[Line Items] |  |  |
Decommissioning Fund Investments, Fair Value | $ 7,495 | $ 8,846 |
Special Use Funds Storm Fund Assets | 1 | 76 |
Debt securities, amortized cost | $ 2,858 | 2,438 |
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity | 9 years |  |
Special Use Funds Other Investments Weighted Average Maturity | 7 years |  |
Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Realized gains | $ 30 | 78 | $ 110
Realized losses | 141 | 73 | 70
Proceeds from sale and maturity of Available-for-sale Securities | 2,207 | 1,831 | 2,541
Available for sale securities: Special Use Funds - Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Unrealized gains | 4 | 76 |
Unrealized losses | 285 | 19 |
Fair Value | 2,315 | 1,100 |
FPL [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Decommissioning Fund Investments, Fair Value | 5,220 | 6,082 |
Special Use Funds Storm Fund Assets | 1 | 76 |
Debt securities, amortized cost | $ 1,873 | 1,877 |
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity | 9 years |  |
FPL [Member] | Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Realized gains | $ 24 | 59 | 83
Realized losses | 111 | 57 | 56
Proceeds from sale and maturity of Available-for-sale Securities | 1,371 | 1,330 | 2,162
FPL [Member] | Available for sale securities: Special Use Funds - Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Unrealized gains | 3 | 63 |
Unrealized losses | 193 | 15 |
Fair Value | 1,466 | 857 |
Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
marketable securities, unrealized gain (loss) recognized during the period on securities still held | (1,028) | 981 | 627
Equity Securities [Member] | FPL [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
marketable securities, unrealized gain (loss) recognized during the period on securities still held | $ (677) | $ 652 | $ 444

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- Definition This item represents the weighted-average maturity of debt securities (in years) in nuclear decommissioning funds at the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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