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Non-Derivative Fair Value Measurements (Fair Value of Instruments Recorded at Other than Fair Value) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Reported Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Special Use Funds Fair Value Disclosure | $ 919 | $ 892
Other Investments Financial Instruments Fair Value Disclosure | 29 | 30
Long Term Debt Including Current Maturities Fair Value Disclosure | 46,082 | 39,667
Reported Value Measurement [Member] | Other Current Liabilities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long Term Debt Including Current Maturities Fair Value Disclosure | 463 |
Estimate of Fair Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Special Use Funds Fair Value Disclosure | 920 | 891
Other Investments Financial Instruments Fair Value Disclosure | 29 | 30
Long Term Debt Including Current Maturities Fair Value Disclosure | 51,525 | 42,928
FPL[Member] | Reported Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Special Use Funds Fair Value Disclosure | 718 | 706
Long Term Debt Including Current Maturities Fair Value Disclosure | 15,676 | 14,161
FPL[Member] | Estimate of Fair Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Special Use Funds Fair Value Disclosure | 719 | 705
Long Term Debt Including Current Maturities Fair Value Disclosure | $ 19,470 | $ 16,448

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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. Fair value and carrying value of long-term debt including current maturities at the balance sheet date. + References No definition available. + Details
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- Definition Other investments that are carried at estimated fair value or cost, which approximates fair value. + References No definition available. + Details
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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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Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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