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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, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity |  | 8 years |
Special use funds: nuclear decommissioning fund assets | $ 6,282 | $ 6,282 | $ 6,003
Special Use Funds Storm Fund Assets | 79 | 79 |
Available for sale debt securities amortized cost | 1,973 | $ 1,973 | 1,921
Available-for-sale Equity Securities, Amortized Cost Basis |  |  | 1,521
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 | 867 | $ 867 | 743
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure | 30 | 30 | 500
Long Term Debt Including Current Maturities Fair Value Disclosure | 29,694 | 29,694 | 33,134
Estimated Fair Value [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Special Use Funds Fair Value Disclosure | 867 | 867 | 744
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure | 30 | 30 | 680
Long Term Debt Including Current Maturities Fair Value Disclosure | 30,326 | $ 30,326 | 35,447
FPL [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity |  | 8 years |
Special use funds: nuclear decommissioning fund assets | 4,285 | $ 4,285 | 4,090
Available for sale debt securities amortized cost | 1,529 | $ 1,529 | 1,443
Available-for-sale Equity Securities, Amortized Cost Basis |  |  | 783
Fair Value Assumptions, Expected Term |  | 1 year |
Storm Fund Included In Special Use Funds | 79 | $ 79 |
FPL [Member] | Carrying Amount [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Special Use Funds Fair Value Disclosure | 688 | 688 | 593
Long Term Debt Including Current Maturities Fair Value Disclosure | 11,691 | 11,691 | 11,702
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 | 688 | 688 | 593
Long Term Debt Including Current Maturities Fair Value Disclosure | 12,438 | 12,438 | $ 13,285
Equity Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
marketable securities, unrealized gain (loss) on securities still held | 192 | 226 |
Equity Securities [Member] | FPL [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
marketable securities, unrealized gain (loss) on securities still held | $ 130 | $ 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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- Definition This item represents the weighted-average maturity of debt securities (in years) held by a regulated entity in the storm fund 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 Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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