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Fair Value Measurements (Fair Value of Instruments Recorded at Other Than Fair Value and Special Use Funds) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Special use funds: nuclear decommissioning fund assets | $ 6,724 |  | $ 6,724 |  | $ 6,880
Special Use Funds Storm Fund Assets | 76 |  | 76 |  | 74
Available for sale debt securities amortized cost | 2,001 |  | $ 2,001 |  | 2,030
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity |  |  | 8 years |  |
Fair Value Assumptions, Expected Term |  |  | 1 year |  |
Carrying Amount [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Special Use Funds Fair Value Disclosure | 879 |  | $ 879 |  | 892
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure | 24 |  | 24 |  | 30
Long Term Debt Including Current Maturities Fair Value And Carrying Value | 45,735 |  | 45,735 |  | 39,667
Estimated Fair Value [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Special Use Funds Fair Value Disclosure | 878 |  | 878 |  | 891
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure | 24 |  | 24 |  | 30
Long Term Debt Including Current Maturities Fair Value And Carrying Value | 50,020 |  | 50,020 |  | 42,928
FPL [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Special use funds: nuclear decommissioning fund assets | 4,614 |  | 4,614 |  | 4,697
Special Use Funds Storm Fund Assets | 76 |  | 76 |  | 74
Available for sale debt securities amortized cost | 1,498 |  | $ 1,498 |  | 1,523
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity |  |  | 9 years |  |
Fair Value Assumptions, Expected Term |  |  | 1 year |  |
FPL [Member] | Carrying Amount [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Special Use Funds Fair Value Disclosure | 695 |  | $ 695 |  | 706
Long Term Debt Including Current Maturities Fair Value And Carrying Value | 14,419 |  | 14,419 |  | 14,161
FPL [Member] | Estimated Fair Value [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Special Use Funds Fair Value Disclosure | 694 |  | 694 |  | 705
Long Term Debt Including Current Maturities Fair Value And Carrying Value | 18,007 |  | 18,007 |  | 16,448
Equity Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
marketable securities, unrealized gain (loss) recognized during the period on securities still held | 602 | $ 116 | (190) | $ 481 |
Equity Securities [Member] | FPL [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
marketable securities, unrealized gain (loss) recognized during the period on securities still held | $ 395 | $ 77 | $ (96) | $ 311 |
Other Current Liabilities [Member] | Carrying Amount [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Long Term Debt Including Current Maturities Fair Value And Carrying Value |  |  |  |  | $ 463

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. An amount representing decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. + References No definition available. + Details
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