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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 | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Special use funds: nuclear decommissioning fund assets | $ 6,564 |  | $ 6,564 |  | $ 5,818
Special Use Funds Storm Fund Assets | 70 |  | 70 |  | 68
Available for sale debt securities amortized cost | 1,962 |  | $ 1,962 |  | 1,994
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 | 958 |  | $ 958 |  | 884
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure | 30 |  | 30 |  | 54
Long Term Debt Including Current Maturities Fair Value Disclosure | 39,032 |  | 39,032 |  | 29,498
Estimated Fair Value [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Special Use Funds Fair Value Disclosure | 957 |  | 957 |  | 883
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure | 30 |  | 30 |  | 54
Long Term Debt Including Current Maturities Fair Value Disclosure | 42,362 |  | 42,362 |  | 30,043
FPL [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Special use funds: nuclear decommissioning fund assets | 4,499 |  | 4,499 |  | 3,987
Special Use Funds Storm Fund Assets | 70 |  | 70 |  | 68
Available for sale debt securities amortized cost | 1,457 |  | $ 1,457 |  | 1,542
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity |  |  | 8 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 | 767 |  | $ 767 |  | 693
Long Term Debt Including Current Maturities Fair Value Disclosure | 14,171 |  | 14,171 |  | 11,783
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 | 766 |  | 766 |  | 692
Long Term Debt Including Current Maturities Fair Value Disclosure | 16,567 |  | 16,567 |  | $ 12,613
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 | 21 | $ 192 | 500 | $ 226 |
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 | $ 18 | $ 130 | $ 327 | $ 167 |

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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 of long-term debt including current maturities at the balance sheet date. + 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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- 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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